Category Archives: node red dashboard

Node-RED Global Flow and Context

There’s a mouthful. This short article is about the various kinds of variables used in Node-Red and more importantly how to initialise them and how to view them.

So in Node-Red when you want to use variables – there are three basic types as well as local variables.

So for example – you’ve opened up a FUNCTION block and you want to use some variables. VAR is always a good start.

var fred=1;

A way to get a variable to PERSIST behind that simply function invocation to the next time around, use this;

context.set(“fred”,1);

If you’d like that var to be available to any other function in that flow (or page if you like) - use:

flow.set(“fred”,1);

and if you need a global variable that can be accessed anywhere within Node-Red including other flows  – I use them all the time for things like thermostat objects etc… use global.

global.set(“fred”,1);

Of course you can recall said variables as global.get(“fred”); etc. Don't use the old method (example global.context.fred) - there's a reason the Node-Red guys are steering us in this direction.

This is not meant as a course on programming – you can read all about this on the Node-Red site – just look up variables.

So three useful types of variable.

But there’s a problem. Node-Red runs asynchronously and in my first efforts I would have an INIT tab and initialise my global variables there. Once in a blue moon I would see a non-destructive failure with the logs showing that I’d tried to use a variable before it had been initialised (created, even).  So in a platform where everything is running asynchronously how do you ensure (without checking every single time you use it) that a variable has been initialised…. especially important for globals.

One way which I don’t really like is to ensure that the variable is initialised in the left most tab. as that runs first… ok… kind of….

Well it turns out “there’s a node for that”.  Node-Red-Contrib-Config does that – you can set up a variable – which could be a whole object – an no matter where you put this node – it will run BEFORE the main flows start up – I tested it, it works. My only niggle might be that the VALUE field needs to be expandable – a single line is not much use for large objects.

npm install node-red-contrib-config

So that’s one side of it.

The other side is – would it not be nice if you could have a tab to show you the current status, names and values of all of your global variables – and more. Well, now you can.

This needs a SLIGHT mod to Node-Red so if you’re new you might want to back stuff up.

In the directory you normally (hopefully locally) npm install stuff –

https://www.npmjs.com/package/node-red-contrib-contextbrowser

So the install is:

npm install node-red-contrib-contextbrowser

Stop Node-Red and in (in my case) and make a slight edit

nano /usr/lib/node_modules/node-red/red/runtime/nodes/context.js

This is the function you need to alter - very carefully add one line as I have in bold. That’s it – don’t make any other changes.….and this IS case-sensitive.

function createContext(id,seed) {
var data = seed || {};
var obj = seed || {};
obj.get = function get(key) {
return util.getMessageProperty(data,key);
};
obj.set = function set(key, value) {
util.setMessageProperty(data,key,value);
}
  obj.getKeys = function() { return Object.getOwnPropertyNames(data); }
return obj;
}

If you're something that does not show bold, the line starting "obj.getKeys" is the addition.

(NODE RED GUYS – any chance of making the above standard???)

Start up Node-Red (this works even if you use HTTPS and have password on Node-Red)

And lo – you should have a new tab on the right… click in the editor on a node or function you know has variables initialised…

and then use the refresh in that new tab..

My test..

tmp6E51

The contents of that orange function

tmpD029

 

And..

tmp65A3

As you can see, you must select the particular node or function with the mouse first – then hit the little refresh in the contextbrowser tab - you then see above freddy and the value in the tab – along with any others you’ve defined in that node or function. Ok it’s not quite debugging but better than nothing.

Now moving to the Global tab is another matter as I have several globals including some big objects – if they are very big – you might have to hit the little … indicator to expand them.

tmp3C87

So for me this is marvellous – I can now set up global vars with the confidence that they will be initialised properly at the start – and I can also get a nice overall view of the globals I’ve used – something I could not easily do before.


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Thermometers

Thermometers for Node-Red

Three thermometers in a row for Node-Red (or as many or few as you like really) for Node-Red Dashboard. Another fine example of simple gauges and unlike some it is easy to make multiple gauges on one page – I will demonstrate three.

Here is the library source, I grabbed the larger one and saved as gauges-min.js in my /myjs folder – see previous blogs for setting this up with Node-Red.

Here is the code for one – and a flow example with three independent units.

You can of course alter the colours to whatever you want.

thermometer flow for Node-Red

The code for one template:

<script src="/myjs/gauge.min.js"></script>

<script>
  (function(scope){ 
            scope.$watch('msg', function(msg) {
               if (typeof(msg.payload) != "undefined") { gauge2.value=msg.payload; gauge2.draw(); }
            });
    })(scope);

var gauge2 = new LinearGauge({
    renderTo: 'mycanvas',
    valueBox: false,
    highlights: [ 
            {"from": 0, "to": 10, "color": "rgba(50, 50, 200, .75)"},
            {"from": 10, "to": 20, "color": "rgba(50, 200, 200, .75)"},
            {"from": 20, "to": 30, "color": "rgba(50, 200, 50, .75)"},
            {"from": 30, "to": 50, "color": "rgba(200, 200, 50, .75)"},
            {"from": 50, "to": 100, "color": "rgba(200, 50, 50, .75)"}
            ],
    barWidth: 10,
    units: "°C",
    borderShadowWidth: 0,
    borders: false,
    value: 35
}).draw();

</script>

<canvas id="mycanvas" 
    data-type="linear-gauge"
    data-width="106"
    data-height="270"
    data-units="°C"
    data-min-value="0"
    data-start-angle="90"
    data-ticks-angle="180"
    data-value-box="false"
    data-max-value="220"
    data-major-ticks="0,20,40,60,80,100,120,140,160,180,200,220"
    data-minor-ticks="2"
    data-stroke-ticks="true"
    data-color-plate="#fff"
    data-border-shadow-width="0"
    data-borders="false"
    data-needle-type="arrow"
    data-needle-width="2"
    data-needle-circle-size="7"
    data-needle-circle-outer="true"
    data-needle-circle-inner="false"
    data-animation-duration="1500"
    data-animation-rule="linear"
    data-bar-width="10"
    data-value="35"
></canvas>

The sample flow above

[{"id":"ddc888ba.e45578","type":"ui_template","z":"c552e8d2.712b48","group":"33279d5b.72b122","name":"controller","order":0,"width":"2","height":"5","format":"<script src=\"/myjs/gauge.min.js\"></script>\n\n<script>\n  (function(scope){ \n            scope.$watch('msg', function(msg) {\n               if (typeof(msg.payload) != \"undefined\") { gauge3.value=msg.payload; gauge3.draw(); }\n            });\n    })(scope);\n\nvar gauge3 = new LinearGauge({\n    renderTo: 'mycanvas2',\n    valueBox: false,\n    highlights: [ \n            {\"from\": 0, \"to\": 10, \"color\": \"rgba(50, 50, 200, .75)\"},\n            {\"from\": 10, \"to\": 20, \"color\": \"rgba(50, 200, 200, .75)\"},\n            {\"from\": 20, \"to\": 30, \"color\": \"rgba(50, 200, 50, .75)\"},\n            {\"from\": 30, \"to\": 50, \"color\": \"rgba(200, 200, 50, .75)\"},\n            {\"from\": 50, \"to\": 100, \"color\": \"rgba(200, 50, 50, .75)\"}\n            ],\n    barWidth: 10,\n    units: \"°C\",\n    borderShadowWidth: 0,\n    borders: false,\n    value: 35\n}).draw();\n\n</script>\n\n<canvas id=\"mycanvas2\" \n    data-type=\"linear-gauge\"\n    data-width=\"106\"\n    data-height=\"270\"\n    data-units=\"°C\"\n    data-min-value=\"0\"\n    data-start-angle=\"90\"\n    data-ticks-angle=\"180\"\n    data-value-box=\"false\"\n    data-max-value=\"220\"\n    data-major-ticks=\"0,20,40,60,80,100,120,140,160,180,200,220\"\n    data-minor-ticks=\"2\"\n    data-stroke-ticks=\"true\"\n    data-color-plate=\"#fff\"\n    data-border-shadow-width=\"0\"\n    data-borders=\"false\"\n    data-needle-type=\"arrow\"\n    data-needle-width=\"2\"\n    data-needle-circle-size=\"7\"\n    data-needle-circle-outer=\"true\"\n    data-needle-circle-inner=\"false\"\n    data-animation-duration=\"1500\"\n    data-animation-rule=\"linear\"\n    data-bar-width=\"10\"\n    data-value=\"35\"\n></canvas>\n","storeOutMessages":false,"fwdInMessages":false,"x":960,"y":2120,"wires":[[]]},{"id":"27cb8298.0e94de","type":"ui_template","z":"c552e8d2.712b48","group":"33279d5b.72b122","name":"controller","order":0,"width":"2","height":"5","format":"<script src=\"/myjs/gauge.min.js\"></script>\n\n<script>\n  (function(scope){ \n            scope.$watch('msg', function(msg) {\n               if (typeof(msg.payload) != \"undefined\") { gauge4.value=msg.payload; gauge4.draw(); }\n            });\n    })(scope);\n\nvar gauge4 = new LinearGauge({\n    renderTo: 'mycanvas3',\n    valueBox: false,\n    highlights: [ \n            {\"from\": 0, \"to\": 10, \"color\": \"rgba(50, 50, 200, .75)\"},\n            {\"from\": 10, \"to\": 20, \"color\": \"rgba(50, 200, 200, .75)\"},\n            {\"from\": 20, \"to\": 30, \"color\": \"rgba(50, 200, 50, .75)\"},\n            {\"from\": 30, \"to\": 50, \"color\": \"rgba(200, 200, 50, .75)\"},\n            {\"from\": 50, \"to\": 100, \"color\": \"rgba(200, 50, 50, .75)\"}\n            ],\n    barWidth: 10,\n    units: \"°C\",\n    borderShadowWidth: 0,\n    borders: false,\n    value: 35\n}).draw();\n\n</script>\n\n<canvas id=\"mycanvas3\" \n    data-type=\"linear-gauge\"\n    data-width=\"106\"\n    data-height=\"270\"\n    data-units=\"°C\"\n    data-min-value=\"0\"\n    data-start-angle=\"90\"\n    data-ticks-angle=\"180\"\n    data-value-box=\"false\"\n    data-max-value=\"220\"\n    data-major-ticks=\"0,20,40,60,80,100,120,140,160,180,200,220\"\n    data-minor-ticks=\"2\"\n    data-stroke-ticks=\"true\"\n    data-color-plate=\"#fff\"\n    data-border-shadow-width=\"0\"\n    data-borders=\"false\"\n    data-needle-type=\"arrow\"\n    data-needle-width=\"2\"\n    data-needle-circle-size=\"7\"\n    data-needle-circle-outer=\"true\"\n    data-needle-circle-inner=\"false\"\n    data-animation-duration=\"1500\"\n    data-animation-rule=\"linear\"\n    data-bar-width=\"10\"\n    data-value=\"35\"\n></canvas>\n","storeOutMessages":false,"fwdInMessages":false,"x":960,"y":2200,"wires":[[]]},{"id":"7df32c36.100ef4","type":"inject","z":"c552e8d2.712b48","name":"","topic":"","payload":"20","payloadType":"num","repeat":"","crontab":"","once":false,"x":770,"y":2100,"wires":[["ddc888ba.e45578"]]},{"id":"54305565.bdfd7c","type":"inject","z":"c552e8d2.712b48","name":"","topic":"","payload":"60","payloadType":"num","repeat":"","crontab":"","once":false,"x":770,"y":2140,"wires":[["ddc888ba.e45578"]]},{"id":"7907996d.21af38","type":"inject","z":"c552e8d2.712b48","name":"","topic":"","payload":"10","payloadType":"num","repeat":"","crontab":"","once":false,"x":770,"y":2180,"wires":[["27cb8298.0e94de"]]},{"id":"583f639c.99440c","type":"inject","z":"c552e8d2.712b48","name":"","topic":"","payload":"90","payloadType":"num","repeat":"","crontab":"","once":false,"x":770,"y":2220,"wires":[["27cb8298.0e94de"]]},{"id":"c8fdd54c.823418","type":"ui_template","z":"c552e8d2.712b48","group":"33279d5b.72b122","name":"controller","order":0,"width":"2","height":"5","format":"<script src=\"/myjs/gauge.min.js\"></script>\n\n<script>\n  (function(scope){ \n            scope.$watch('msg', function(msg) {\n               if (typeof(msg.payload) != \"undefined\") { gauge2.value=msg.payload; gauge2.draw(); }\n            });\n    })(scope);\n\nvar gauge2 = new LinearGauge({\n    renderTo: 'mycanvas',\n    valueBox: false,\n    highlights: [ \n            {\"from\": 0, \"to\": 10, \"color\": \"rgba(50, 50, 200, .75)\"},\n            {\"from\": 10, \"to\": 20, \"color\": \"rgba(50, 200, 200, .75)\"},\n            {\"from\": 20, \"to\": 30, \"color\": \"rgba(50, 200, 50, .75)\"},\n            {\"from\": 30, \"to\": 50, \"color\": \"rgba(200, 200, 50, .75)\"},\n            {\"from\": 50, \"to\": 100, \"color\": \"rgba(200, 50, 50, .75)\"}\n            ],\n    barWidth: 10,\n    units: \"°C\",\n    borderShadowWidth: 0,\n    borders: false,\n    value: 35\n}).draw();\n\n</script>\n\n<canvas id=\"mycanvas\" \n    data-type=\"linear-gauge\"\n    data-width=\"106\"\n    data-height=\"270\"\n    data-units=\"°C\"\n    data-min-value=\"0\"\n    data-start-angle=\"90\"\n    data-ticks-angle=\"180\"\n    data-value-box=\"false\"\n    data-max-value=\"220\"\n    data-major-ticks=\"0,20,40,60,80,100,120,140,160,180,200,220\"\n    data-minor-ticks=\"2\"\n    data-stroke-ticks=\"true\"\n    data-color-plate=\"#fff\"\n    data-border-shadow-width=\"0\"\n    data-borders=\"false\"\n    data-needle-type=\"arrow\"\n    data-needle-width=\"2\"\n    data-needle-circle-size=\"7\"\n    data-needle-circle-outer=\"true\"\n    data-needle-circle-inner=\"false\"\n    data-animation-duration=\"1500\"\n    data-animation-rule=\"linear\"\n    data-bar-width=\"10\"\n    data-value=\"35\"\n></canvas>\n","storeOutMessages":false,"fwdInMessages":false,"x":960,"y":2040,"wires":[[]]},{"id":"8cc2ade9.5db9b","type":"inject","z":"c552e8d2.712b48","name":"","topic":"","payload":"5","payloadType":"num","repeat":"","crontab":"","once":false,"x":770,"y":2020,"wires":[["c8fdd54c.823418"]]},{"id":"277f033f.43ecbc","type":"inject","z":"c552e8d2.712b48","name":"","topic":"","payload":"48","payloadType":"num","repeat":"","crontab":"","once":false,"x":770,"y":2060,"wires":[["c8fdd54c.823418"]]},{"id":"33279d5b.72b122","type":"ui_group","z":"","name":"LCD Test","tab":"34cddaf3.8a9cd6","disp":true,"width":"6"},{"id":"34cddaf3.8a9cd6","type":"ui_tab","z":"","name":"testz","icon":"dashboard"}]
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LCD Display for Node-Red

Pete's LCDAs must be obvious by now, I’m on a roll here. Having decided that Node-Red Dashboard is the way forward ( would in the past have used BLYNK or Imperihome) I’ve been getting to grips with the dashboard and as you’ll see if you check recent blogs I’ve had a fair bit of success with various CANVAS based libraries, getting them into the Dashboard.

Pete's LCDAnd so it was that over the weekend, MrShark contacted me with this link – a very nice, simple stand-along clock display. Well, that fired me up and so I grabbed the code and started ripping it apart.  One thing led to another and here we have a nice LCD display programmable in a wide range of (I have to say stunning) colours and able to display temperature or weather icons on the right  – and in the process I learned a few things such as what position-absolute is all about and a great deal about transparency.

Pete's LCDIn the display here you see the use of border shadows, 7-segment display fonts and transparency to give the impression of an old-fashioned LCD display – I think it does a nice job.  The code here displays the time, date and day automatically and you can inject temperature into it – but a brief look and you’ll soon realise that you could put just about anything in there – so I look forward to feedback from readers.  To make this work, from the link above I had to grab 3 fonts (DSEG7Modern-Italic.woff,  DSEG14Modern-Italic.woff and DSEG7Modern-BoldItalic.woff – also required is  DSEGWeather.woff) from the link above (into myfonts – see previous blogs for the reason I made up directory names like myfonts and mycss etc).

Pete's LCDSo – here is the code to put into a Dashboard template – you just need to inject msg.payload to set the temperature OR weather icons depending on mode – see flow – most of this is just for you to experiment with.

tmp484EThere are several spans in here – all position absolute – which means they overlap and are all relative to the top left of the main DIV – the trick with the LCD is simply the 8 figure semi-transparent – with you number or letter sitting on top of it. Works a treat I should say.  You’ll want a 6*2 size for the template… but of course you may choose to resize this completely.

flow

tmpF88BAn important item include the z-index, I’ve used 50 and 51 arbitrarily – the original code this all came from used 100 and that ended up over-writing the Node-Red Dashboard menu! Of course if you don’t want to show temperature you could make that humidity or anything else really.

tmpA42CInjecting weather – see flow – includes: characters “0” to “9” for; background all segments, sun, cloud, rain, hard rain, snow, thunder rain, thunder hard rain, thunder, sun and cloud and finally “:” for all off.

Below is the code for the flow - make sure you have those fonts and inject this lot into a page in the dashboard - you'll need to change the tab details to suit yourself.

Oh, this page I found while looking for colour ideas…

[{"id":"5439cd84.a88ae4","type":"ui_template","z":"c552e8d2.712b48","group":"1e03a2b2.83a61d","name":"Time and Temp","order":0,"width":"6","height":"2","format":"<script>\n    var icon=\"T\";\n\n        \n    var colours={\n    \"blackOnOrange\": {items:[\"#222\",\"#fb7c00\"]},    \n    \"blackOnGreen\" : {items:[\"#222\",\"#66ac66\"]},\n    \"blackOnBlue\" : {items:[\"#222\",\"#8888ff\"]},\n    \"blackOnYellow\" : {items:[\"#222\",\"#bbbb44\"]},\n    \"blackOnWhite\" : {items:[\"#222\",\"#aaaaaa\"]},\n    \"blackOnPink\" : {items:[\"#222\",\"#ff8888\"]},\n    \"yellowOnRed\" : {items:[\"#ccaa22\",\"#aa2222\"]},\n    \"whiteOnCyan\" : {items:[\"#dddddd\",\"#227777\"]},\n    \"orangeOnBlack\" : {items:[\"#ff8800\",\"#000000\"]},  \n    \"limeOnBlack\" : {items:[\"#00cc55\",\"#000000\"]},  \n    }  \n    \n    var daylist = [\"sun\", \"mon\", \"tue\", \"wed\", \"thu\", \"fri\", \"sat\"];\n    (function(scope){ \n            scope.$watch('msg', function(msg) {\n               if (typeof(msg.type) != \"undefined\") icon=msg.type;\n    \n               if (icon==\"t\")\n                    {\n                        $(\"#DSEGWEATHER-BACK\").text(\" \");\n                        $(\"#DSEGWEATHER-ICON\").text(\" \");\n                        $(\"#DSEGTempcF\").text(\"C\");\n                        $(\"#DSEGTempcB\").text(\"8\");                        \n                        if (typeof(msg.payload) != \"undefined\") { $(\"#DSEGTempF\").text(msg.payload);  $(\"#DSEGTempB\").text(\"88\"); }\n                    }\n                else\n                    {\n                        $(\"#DSEGTempF\").text(\"\");\n                        $(\"#DSEGTempcF\").text(\"\");\n                        $(\"#DSEGTempB\").text(\"\");\n                        $(\"#DSEGTempcB\").text(\"\");\n                        $(\"#DSEGWEATHER-BACK\").text(\"0\");\n                        if (typeof(msg.payload) != \"undefined\") $(\"#DSEGWEATHER-ICON\").text(msg.payload);\n                        \n                    }\n               if (typeof(msg.colour) != \"undefined\") {\n                              $(\".Clock-Wrapper\").css('background-color', colours[msg.colour].items[1]);  $(\".lcdClock\").css('color', colours[msg.colour].items[0]); \n                              if (colours[msg.colour].items[1]==\"#000000\") $(\".background\").css('color',\"rgba(255,255,255,0.15)\"); else  $(\".background\").css('color',\"rgba(0,0,0,0.1)\");\n                        }\n            });\n    })(scope);\n\n    function genTimerStrings(tm, num){\n    \n    \tvar i;\n    \tvar ret = tm.toString(10);\n    \tvar left = ret.length;\n    \n    \tif( left < num){\n    \t\tfor(i=0; i<( num - left ); i++ ){\n    \t\t\tret = String(0) + ret;\n    \t\t}\n    \t}\n    \treturn ret;\n    }\n\n    function updateTimer(){\n    \tvar ret;\n    \tvar date = new Date();\n    \tvar tm_year, tm_mon, tm_date, tm_hour, tm_min, tm_sec, tm_msec,tm_day;\n    \tvar colon;\n    \ttm_year = date.getFullYear();\n    \ttm_mon = date.getMonth()+1;\n    \ttm_date = date.getDate();\n    \ttm_day = date.getDay();\n    \ttm_hour = date.getHours();\n    \ttm_min = date.getMinutes();\n    \ttm_sec = date.getSeconds();\n    \ttm_msec = date.getMilliseconds();\n    \n    \ttm_mon = genTimerStrings(tm_mon, 2);\n    \ttm_date = genTimerStrings(tm_date, 2);\n    \ttm_hour = genTimerStrings(tm_hour, 2);\n    \ttm_min = genTimerStrings(tm_min, 2);\n    \ttm_sec = genTimerStrings(tm_sec, 2);\n    \ttm_day = daylist[tm_day];\n    \n    \tif( tm_msec > 499 ){\n    \t\tcolon = ' ';\n    \t}else{\n    \t\tcolon = ':';\n    \t}\n    \n    \tdocument.getElementById(\"DSEGClock\").innerHTML = tm_hour + colon + tm_min + \"<span style=\\\"font-size:30px;\\\">\"  + tm_sec + \"</span>\";\n    \tdocument.getElementById(\"DSEGClock-Year\").innerHTML = \"<span class=\\\"D7MI\\\">\" + tm_year + \"-\" + tm_mon + \"-\" + tm_date + ' ' + \"</span><span class=\\\"D14MI\\\">\" + tm_day  +  \".\" + \"</span>\";\n    \n    \tsetTimeout(\"updateTimer()\", 500 - date.getMilliseconds()%500 );\n    }\n\n    updateTimer();\n    \n</script>\n\n<style type=\"text/css\">\n.lcdClock {\n\tbackground-color:#fbfbfb;\n\tfont-size:100%;\n\tpadding-left:10px;\n\tpadding-right:10px;\n\tpadding-bottom:10px;\n\tmax-width:300px;\n\tline-height:160%;\n\tcolor:#222;\n\tfont-family:Meiryo, 'Lucida Grande','Hiragino Kaku Gothic ProN', sans-serif;\n}\n\n@font-face {\n  font-family: \"D7MI\";\n  src: url(\"/myfonts/DSEG7Modern-Italic.woff\") format('woff');\n}\n\n@font-face {\n  font-family: \"D14MI\";\n  src: url(\"/myfonts/DSEG14Modern-Italic.woff\") format('woff');\n}\n\n@font-face {\n  font-family: \"D7MBI\";\n  src: url(\"/myfonts/DSEG7Modern-BoldItalic.woff\") format('woff');\n}\n\n@font-face {\n  font-family: \"DWEATHER\";\n  src: url(\"/myfonts/DSEGWeather.woff\") format('woff');\n}\n\n.Weather-Background{\n\tz-index:50;\n\tposition:absolute;\n\ttop:24px;\n\tleft:226px;\n\tfont-size:68px;\n}\n\n.Weather-Front{\n\tz-index:51;\n\tposition:absolute;\n\ttop:24px;\n\tleft:226px;\n\tfont-size:68px;\n}\n\n.D7MI {\nfont-family: \"D7MI\";\n}\n\n.D7MBI {\nfont-family: \"D7MBI\";\n}\n\n.D14MI {\nfont-family: \"D14MI\";\n}\n\n.DWEATHER {\nfont-family: \"DWEATHER\";\nfont-size:68px;\nheight:68px;\n}\n\n.Clock-Wrapper{\n\tposition:relative;\n\tborder:6px solid #000;\n\tborder-radius:9px;\n\theight:68px;\n\twidth:280px;\n\tbackground-color:#fb7c00;\n\tbackground-color:#66ac66;\n\tbox-shadow: 4px 4px 28px 0px rgba(0,0,0,0.3) inset; \n}\n\n.Clock-Time-Background{\n\tz-index:50;\n}\n\n.Clock-Time-Front{\n\tz-index:51;\n}\n\n.Clock-Time-Background,.Clock-Time-Front {\n   \tposition:absolute;\n\ttop:38px;\n\tleft:5px; \n\tfont-size:42px;\n}\n\n.background { color:rgba(0,0,0,0.1); }\n\n.Clock-Year-Background{\n\tz-index:50;\n\tfont-size:18px;\n}\n\n.Clock-Year-Front{\n\tz-index:51;\n}\n\n.Clock-Year-Background,.Clock-Year-Front {\n   \tposition:absolute;\n\ttop:2px;\n\tleft:5px; \n\tfont-size:18px;\n}\n\n.temp { z-index:51; }\n.tempBack { z-index:50; color:rgba(0,0,0,0.1); }\n.temp,.tempBack {\n   \tposition:absolute;\n\ttop:28px;\n\tleft:210px; \n\tfont-size:42px;\n}\n\n.tempc { z-index:51; }\n.tempcBack { z-index:50;  }\n.tempc,.tempcBack {\n   \tposition:absolute;\n\ttop:36px;\n\tleft:278px; \n\tfont-size:24px;\n}\n\n#DSEG7_OUTPUT{\n\tfont-family: \"D7MI\";\n}\n\n#DSEG14_OUTPUT{\n\tfont-family: \"D14MI\";\n}\n\n#DSEG14_OUTPUT, #DSEG7_OUTPUT{\n\tfont-size:18px;\n\tmargin-top:2px;\n\tmargin-bottom:10px;\n}\n\n</style>\n\n\n<div class=\"Clock-Wrapper center lcdClock\">\n\t<span class=\"Clock-Time-Background background  D7MBI\">88:88<span style=\"font-size:30px;\">88</span></span>\n\t<span id=\"DSEGClock\" class=\"Clock-Time-Front D7MBI\"></span>\n\t<span class=\"Clock-Year-Background background\"><span class=\"D7MI\">2088-88-88</span><span class=\"D14MI\"> ~~~</span></span>\n\t<span id=\"DSEGClock-Year\" class=\"Clock-Year-Front\"></span>\n\t\n\t<span id=\"DSEGTempF\" class=\"temp D7MBI\">00</span>\n\t<span id=\"DSEGTempB\" class=\"tempBack background D7MBI\">88</span>\t\n\t<span id=\"DSEGTempcF\" class=\"tempc D7MI\">C</span>\n\t<span id=\"DSEGTempcB\" class=\"tempcBack background D7MI\">8</span>\n\t\n\t\n\t<span id=\"DSEGWEATHER-BACK\" class=\"Weather-Background background DWEATHER\"></span>\n\t<span id=\"DSEGWEATHER-ICON\" class=\"Weather-Front DWEATHER\"></span>\n\t\t\n</div>\n\n","storeOutMessages":true,"fwdInMessages":false,"x":480,"y":1480,"wires":[[]]},{"id":"e26a920b.fd916","type":"inject","z":"c552e8d2.712b48","name":"21c","topic":"","payload":"21","payloadType":"num","repeat":"","crontab":"","once":false,"x":90,"y":1220,"wires":[["5439cd84.a88ae4"]]},{"id":"a92b9b7a.795228","type":"inject","z":"c552e8d2.712b48","name":"32c","topic":"","payload":"32","payloadType":"num","repeat":"","crontab":"","once":false,"x":90,"y":1260,"wires":[["5439cd84.a88ae4"]]},{"id":"6d378317.dd743c","type":"inject","z":"c552e8d2.712b48","name":"green","topic":"","payload":"blackOnGreen","payloadType":"str","repeat":"","crontab":"","once":false,"x":90,"y":1400,"wires":[["a23865de.5f59b8"]]},{"id":"24a314bf.90927c","type":"inject","z":"c552e8d2.712b48","name":"orange","topic":"","payload":"blackOnOrange","payloadType":"str","repeat":"","crontab":"","once":false,"x":90,"y":1440,"wires":[["a23865de.5f59b8"]]},{"id":"a23865de.5f59b8","type":"function","z":"c552e8d2.712b48","name":"","func":"msg.colour=msg.payload;\nmsg.payload=undefined;\nreturn msg;","outputs":1,"noerr":0,"x":270,"y":1480,"wires":[["5439cd84.a88ae4"]]},{"id":"c8edfc9b.be6ce","type":"inject","z":"c552e8d2.712b48","name":"blue","topic":"","payload":"blackOnBlue","payloadType":"str","repeat":"","crontab":"","once":false,"x":90,"y":1480,"wires":[["a23865de.5f59b8"]]},{"id":"18a1c3a.b9c283c","type":"inject","z":"c552e8d2.712b48","name":"yellow","topic":"","payload":"blackOnYellow","payloadType":"str","repeat":"","crontab":"","once":false,"x":90,"y":1520,"wires":[["a23865de.5f59b8"]]},{"id":"a5c4dd24.4b6ff","type":"inject","z":"c552e8d2.712b48","name":"white","topic":"","payload":"blackOnWhite","payloadType":"str","repeat":"","crontab":"","once":false,"x":90,"y":1560,"wires":[["a23865de.5f59b8"]]},{"id":"83e6ddc0.ec7bd","type":"inject","z":"c552e8d2.712b48","name":"pink","topic":"","payload":"blackOnPink","payloadType":"str","repeat":"","crontab":"","once":false,"x":90,"y":1600,"wires":[["a23865de.5f59b8"]]},{"id":"ebfd33d8.c8b13","type":"inject","z":"c552e8d2.712b48","name":"red and light text","topic":"","payload":"yellowOnRed","payloadType":"str","repeat":"","crontab":"","once":false,"x":120,"y":1640,"wires":[["a23865de.5f59b8"]]},{"id":"26972f6.8af94d","type":"inject","z":"c552e8d2.712b48","name":"cyan and white","topic":"","payload":"whiteOnCyan","payloadType":"str","repeat":"","crontab":"","once":false,"x":120,"y":1680,"wires":[["a23865de.5f59b8"]]},{"id":"10449ff5.d9588","type":"inject","z":"c552e8d2.712b48","name":"Type t for TEXT","topic":"","payload":"t","payloadType":"str","repeat":"","crontab":"","once":false,"x":120,"y":1760,"wires":[["fe927255.d2e2a"]]},{"id":"3e44785a.6181b8","type":"inject","z":"c552e8d2.712b48","name":"Type w for weather","topic":"","payload":"w","payloadType":"str","repeat":"","crontab":"","once":false,"x":130,"y":1800,"wires":[["fe927255.d2e2a"]]},{"id":"fe927255.d2e2a","type":"function","z":"c552e8d2.712b48","name":"","func":"msg.type=msg.payload;\nmsg.payload=undefined;\nreturn msg;","outputs":1,"noerr":0,"x":310,"y":1740,"wires":[["5439cd84.a88ae4"]]},{"id":"94706c5b.a9292","type":"inject","z":"c552e8d2.712b48","name":"weather 2","topic":"","payload":"2","payloadType":"str","repeat":"","crontab":"","once":false,"x":100,"y":1299,"wires":[["5439cd84.a88ae4"]]},{"id":"77b95bb8.1ce774","type":"inject","z":"c552e8d2.712b48","name":"weather 3","topic":"","payload":"3","payloadType":"str","repeat":"","crontab":"","once":false,"x":100,"y":1339,"wires":[["5439cd84.a88ae4"]]},{"id":"30c75186.ef732e","type":"inject","z":"c552e8d2.712b48","name":"lime on black","topic":"","payload":"limeOnBlack","payloadType":"str","repeat":"","crontab":"","once":false,"x":110,"y":1720,"wires":[["a23865de.5f59b8"]]},{"id":"1e03a2b2.83a61d","type":"ui_group","z":"","name":"testy","tab":"f9bab960.c839b8","disp":true,"width":"6"},{"id":"f9bab960.c839b8","type":"ui_tab","z":"","name":"testy","icon":"dashboard"}]
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SteelSeries and Node-Red

tmp768EYou should read the previous blog entry before this one – as the principles are the same as are some of the details such as the location of your /myjs folder for Node-Red – so read the other article first. This guage IMHO is the best yet!

To run the example on the right here you should get the SteelSeries library. 2 minified JS files is all you need.

See flow below… you will need the following incoming variables – all done for you in the example but of course you’ll want to customise…

msg.value   // the value of the pointer – in this case 0-100

msg.threshold // the value of the red threshold indicator

msg.userLed  // if true the green user LED will be flashing. You can turn this off if you don’t need it. I’ll use it to indicate a dehumidifier is running.

If the value is less than the threshold, the red LED will flash. This can be inverted in the code. If msg.userLed is true the green LED will be flashing.

I’ve ALSO added as you can see separate ODOMETER (msg.odo - you could have LCD instead) and a trending UP/DOWN/STEADY/OFF  indicator and demo controls – discovering what is available on this gauge is half the battle!!

Everything is configurable, I’ve brought out what I think is useful – the rest is buried in steelseries.js which comes with the package – there is no documentation as such. All you need to store in your myjs library is steelseries-min.js and tween-min.js – but is it worth it? SURE IS  - this is a wonderful device… I can’t wait to get one on a nice large display on the wall.

I’m thinking general use to show temperature, odometer could show humidity, green user LED for dehumidifier on, RED light for heating on and the trending indicator to show maybe whether the heat is on the way up or down – though that much should be obvious from whether the heating is on or not… maybe a use I’ve not thought of yet. Or not – you can turn it off if you want. Wonderful.

flow

Prerequisites: Far too often in blogs like this we “assume” that everyone is keeping up – if not – may I suggest a quick look at this page I put up specifically to give a little background – which might help explain this article.

Looking for help: If anyone knows how to get rid of that chrome frame - DO let me know. frameVisible=false makes it hide but does not expand the gauge to fill in the space -in other words you are still left with an invisible frame - the only article I can find suggests this should not be the case - but it is. Given a small 3*3 frame size I'm after all the resolution I can get).

Here is my code for the example above (also available here):

[{"id":"8d862a4b.c1d588","type":"ui_template","z":"c552e8d2.712b48","group":"1e03a2b2.83a61d","name":"rgraph","order":1,"width":"6","height":"6","format":"<script src=\"/myjs/tween-min.js\"></script>\n<script src=\"/myjs/steelseries-min.js\"></script>\n<script>\nvar radial4;\n    (function(scope){ \n        scope.$watch('msg', function(msg) {\n           if (typeof(msg.value) != \"undefined\") radial4.setValueAnimated(msg.value);\n           if (typeof(msg.threshold) != \"undefined\") radial4.setThreshold(msg.threshold);\n           if (typeof(msg.odo) != \"undefined\")radial4.setOdoValue(msg.odo);  \n           if (typeof(msg.userLed) != \"undefined\") radial4.setUserLedOnOff(msg.userLed);  \n           if (typeof(msg.trend) != \"undefined\")\n            {\n                if (msg.trend==1)     radial4.setTrend(steelseries.TrendState.UP);\n                if (msg.trend==0)     radial4.setTrend(steelseries.TrendState.STEADY);\n                if (msg.trend==-1)    radial4.setTrend(steelseries.TrendState.DOWN);\n                if (msg.trend==-2)    radial4.setTrend(steelseries.TrendState.OFF);\n            }\n        });\n    })(scope);\n\n    var sections = [steelseries.Section(0, 25, 'rgba(0, 0, 220, 0.3)'),\n                        steelseries.Section(25, 50, 'rgba(0, 220, 0, 0.3)'),\n                        steelseries.Section(50, 75, 'rgba(220, 220, 0, 0.3)') ],\n\n            // Define one area\n    areas = [steelseries.Section(75, 100, 'rgba(220, 0, 0, 0.3)')],\n\n    radial4 = new steelseries.Radial('canvasRadial4', {\n            gaugeType: steelseries.GaugeType.TYPE4,\n            size: 292,\n            section: sections,\n            area: areas,\n            titleString: \"Heating\",\n            unitString: \"Degrees C\",\n            threshold: 50,\n            thresholdRising: false,\n            userLedVisible: true,\n            useOdometer: true,\n            lcdVisible: true,\n            trendVisible: true\n        });\n                        \n    radial4.setFrameDesign(steelseries.FrameDesign.BLACK_METAL);\n    radial4.setValueAnimated(0);\n    radial4.setThreshold(50);\n    radial4.blinkUserLed(0);\n    radial4.setOdoValue(0);\n\n\n</script>\n\n<canvas id=\"canvasRadial4\" width=\"401\" height=\"401\"></canvas>\n","storeOutMessages":true,"fwdInMessages":false,"x":490,"y":920,"wires":[[]]},{"id":"94d08897.6b6f78","type":"inject","z":"c552e8d2.712b48","name":"Set needle to 88","topic":"","payload":"88","payloadType":"num","repeat":"","crontab":"","once":false,"x":140,"y":700,"wires":[["a72af19d.e17e2"]]},{"id":"f5301eaa.f021d","type":"inject","z":"c552e8d2.712b48","name":"Set needle to 33","topic":"","payload":"33","payloadType":"num","repeat":"","crontab":"","once":false,"x":140,"y":740,"wires":[["a72af19d.e17e2"]]},{"id":"a72af19d.e17e2","type":"function","z":"c552e8d2.712b48","name":"","func":"msg.value=msg.payload;\nreturn msg;","outputs":1,"noerr":0,"x":310,"y":720,"wires":[["8d862a4b.c1d588"]]},{"id":"cb9d2598.de4918","type":"inject","z":"c552e8d2.712b48","name":"Set threshhold to 60","topic":"","payload":"60","payloadType":"num","repeat":"","crontab":"","once":false,"x":150,"y":780,"wires":[["d1f505b0.62c9f8"]]},{"id":"b50f3ae1.7cbdd8","type":"inject","z":"c552e8d2.712b48","name":"Set threshold to 30","topic":"","payload":"30","payloadType":"num","repeat":"","crontab":"","once":false,"x":150,"y":820,"wires":[["d1f505b0.62c9f8"]]},{"id":"d1f505b0.62c9f8","type":"function","z":"c552e8d2.712b48","name":"","func":"msg.threshold=msg.payload;\nreturn msg;","outputs":1,"noerr":0,"x":310,"y":800,"wires":[["8d862a4b.c1d588"]]},{"id":"cd9b1fe2.9c989","type":"inject","z":"c552e8d2.712b48","name":"Set user LED ON","topic":"","payload":"true","payloadType":"bool","repeat":"","crontab":"","once":false,"x":140,"y":861,"wires":[["199bc0e7.607eff"]]},{"id":"59205954.a730c8","type":"inject","z":"c552e8d2.712b48","name":"Setuser LED OFF","topic":"","payload":"false","payloadType":"bool","repeat":"","crontab":"","once":false,"x":150,"y":901,"wires":[["199bc0e7.607eff"]]},{"id":"199bc0e7.607eff","type":"function","z":"c552e8d2.712b48","name":"","func":"msg.userLed=msg.payload;\nreturn msg;","outputs":1,"noerr":0,"x":310,"y":881,"wires":[["8d862a4b.c1d588"]]},{"id":"f13cc85.7df0038","type":"comment","z":"c552e8d2.712b48","name":"Example use of Steelseries Gauge","info":"","x":180,"y":660,"wires":[]},{"id":"ffa9ff04.4fc7f","type":"inject","z":"c552e8d2.712b48","name":"Trend UP","topic":"","payload":"1","payloadType":"num","repeat":"","crontab":"","once":false,"x":120,"y":940,"wires":[["2320de53.8b2e42"]]},{"id":"3c6f1b6f.e42924","type":"inject","z":"c552e8d2.712b48","name":"Steady","topic":"","payload":"0","payloadType":"num","repeat":"","crontab":"","once":false,"x":110,"y":980,"wires":[["2320de53.8b2e42"]]},{"id":"2320de53.8b2e42","type":"function","z":"c552e8d2.712b48","name":"","func":"msg.trend=msg.payload;\nreturn msg;","outputs":1,"noerr":0,"x":310,"y":960,"wires":[["8d862a4b.c1d588"]]},{"id":"e0daa005.96fd5","type":"inject","z":"c552e8d2.712b48","name":"Down","topic":"","payload":"-1","payloadType":"num","repeat":"","crontab":"","once":false,"x":110,"y":1020,"wires":[["2320de53.8b2e42"]]},{"id":"893a4668.be5a78","type":"inject","z":"c552e8d2.712b48","name":"Off","topic":"","payload":"-2","payloadType":"num","repeat":"","crontab":"","once":false,"x":110,"y":1060,"wires":[["2320de53.8b2e42"]]},{"id":"a222fdf0.4934d","type":"inject","z":"c552e8d2.712b48","name":"ODO 50","topic":"","payload":"50","payloadType":"num","repeat":"","crontab":"","once":false,"x":120,"y":1100,"wires":[["f7bee9bf.d05478"]]},{"id":"7a3e24c1.17e7dc","type":"inject","z":"c552e8d2.712b48","name":"ODO 78.6","topic":"","payload":"78.6","payloadType":"num","repeat":"","crontab":"","once":false,"x":120,"y":1140,"wires":[["f7bee9bf.d05478"]]},{"id":"f7bee9bf.d05478","type":"function","z":"c552e8d2.712b48","name":"","func":"msg.odo=msg.payload;\nreturn msg;","outputs":1,"noerr":0,"x":310,"y":1120,"wires":[["8d862a4b.c1d588"]]},{"id":"1e03a2b2.83a61d","type":"ui_group","z":"","name":"testy","tab":"f9bab960.c839b8","disp":true,"width":"6"},{"id":"f9bab960.c839b8","type":"ui_tab","z":"","name":"testy","icon":"dashboard"}]
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The Ongoing Knob

jQuery KnobI refer you to this article if you’re new in here - http://tech.scargill.net/more-dashboard-goodness/ – we’ve been having a lively discussion and lots of exciting new possibilities coming out of a chance discovery of the JQUERY KNOB and what is now our ability to integrate that with Node-Red. The purpose of this is to increase the usability of the web-based Node-Red Dashboard by introducing new and useful controls.

I won’t go through the history here – it’s all in that blog entry which you should read first before getting into discussion here.

So now we can create a touch/mouse-driven knob for Node-Red Dashboard, in a template – and we can replicate as many of these as we like in a tab. Many thanks to those who helped get this off the ground.

But once the novelty wears off, we find that we need more work on this for some scenarios. The knob can be coloured and it’s shape and size can be changed but what about that value in the middle. Early attempts at adding a “%” sign or similar failed miserably – until I actually started looking at the docs for the knob – at which point some things became clear.

I can think of two immediate modifications to the basic knob which come in as useful – the first is the addition of a percentage or degrees character – the second is slightly more complicated. I want to use the knob to show a time in hours and minutes and to let me alter that – worse I want the time to increment in 15 minute intervals – giving me back a value in minutes while SHOWING HH:MM -  so - how to do that:

It turns out to be surprisingly easy if you’ll bear with me.

So firstly the easy one – setting limits and steps can all be done in the input definition.

<input  id="jqueryknob{{$id}}"
        class="cDial1"
        data-width="98%"
        data-height="98%" 
        data-cursor=true
        data-thickness=.25
        data-linecap=round
        data-fgColor="#66CC66"
        data-bgColor="#CCAAAA"
        data-angleOffset=-125
        data-angleArc=250
        data-min="0"
        data-max="1440"
        data-step="15"

        value="{{msg.payload ?  msg.payload : 0}}"
>

If you refer back to the original article – the input definition is in there and I’ve simply lifted that and added 3 more lines – so now we can have any start and any end values and a step – in my case the number of minutes in the day. So how do we get from THAT to the display above right.

It turns out there is an extra bit we can shove into the code… a snippet from the original blog follows with something new – two examples here.

$("#jqueryknob" + scope.$id).knob({
    'format': function (value) {
        return value + ‘%’;
    },
               
    change : function (value) {
    },
    release : function (value) {
        if(scope.msgSend)scope.sendData(value);
    },

The above adds a percentage sign to the display WITHOUT affecting the actual output from our template – you could of course add any other symbol. The example below though looking more complex is just formatting to give me my HH:MM format – again without affecting the output of the template which in this case is in minutes.

 

$("#jqueryknob" + scope.$id).knob({
   'format': function (value) {
        return ("0" + (Math.floor( value / 60))).slice(-2) + ":" + ("0" + (value % 60)).slice(-2);
    },
               
    change : function (value) {
    },
    release : function (value) {
        if(scope.msgSend)scope.sendData(value);
    },

So that one addition above allows you to control what you see in the text of the knob without affecting the actual value.

I suspect there is far more to be gained from further examination of this widget. ANGULAR also has a knob - https://radmie.github.io/ng-knob/ and that has some nice features including subtitles. Perhaps we can look at this one sometime!

For now here is the latest update of the actual code used in my test knob – set the template to 6*6. I’ve removed a line that wasn’t doing anything and changed msg.payload to msg so in future we might add more stuff in there (thanks Dave).

Don’t forget to create a template with the CSS in it – and make sure your template tickbox settings are like this.

 

Template tick-box settings 

Enjoy.

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More Node-Red Dashboard Success

Dashboard buttonsWell, it looks like my revelations with hiding the mouse has upset WordPress – the previous blog on the subject makes some people’s mice disappear!  Good job I wasn’t testing a self-destruct button.

It’s been a good day today – I discovered SLACK and I’ve been happily chatting to folk about my Node-Red-Dashboard issues and at the end of it all, not only have the issues gone away but I’m making progress.

So – there are a couple of things to notice and some you won’t.

So firstly – my button experience until now on Node-Red-Dashboard has been blighted by a SWIPE command which meant if you pressed a button near the right of the screen and in any way slid your finger  to the right – the page would change – in the unreleased update to Node-Red-Dashboard (needs just a tad more work and docs apparently) that has gone.  Excellent. I’ve seen this “feature” in other packages and it really does not work if you’re supposed to interact with buttons.

In my last blog on the subject you’ll see I can hide that top menu if needed (the blue menu is great on a phone – not much use on a thermostat)… and today I discovered that desktop TEMPLATES have a spacing round them that DID make it impossible to make your own buttons that would be size compatible with the UI built-in buttons.

That is all now history. So – the built in buttons – no text wrap which make it hard to make small, a visual effect on press that really is hardly noticeable, inability to change colour or indeed anything other than text colour – all problems now history.

The garish red, green and blue buttons you see above – note the rounded edges you control, there is an attractive and obvious colour change pm press (and return to original colour after press without you having to program it ), audible feedback on press (on phones with vibrators), wrap on text – indeed you can put anything in there - icons etc.

This is due to a combination on my insistence on having flexibility – my own experience and lots of help from several guys on the web today – thanks everyone for filling in the missing bits! The end result of all of this – I really DO think that Dashboard is able to take on the big boys and I’m currently backing away from the alternatives.

So – the enabling technology here is the node-red-dashboard template – this has LOTS of potential and it is now easy to accept incoming information – and send out a value on press or whatever. You’ll note elsewhere that I’ve used this to make whole pages with colour-changing icons etc., well here I’m using one template per button – but that’s just for the purpose of demonstration.

Things that needed considering – CSS for button sizing, JS to get the button colour and change it while pressing then change it back – I was not going to get into setting each and every button press colour etc. More CSS for styling. All described below and trivial to implement.

SO it turns out that if you put a template on a page – make sure it is the first one – you can put nothing but JS and CSS in it – and it will not do anything VISIBLE – but will supply your functions and CSS for the whole page – isn’t that HANDY!!!

tmp3513Let’s take a look at what is driving the display up there (again ignoring the text at the top – start with the buttons). To the left you see a template all on it’s own – then 3 templates – then 3 buttons – not connected to anything as this is merely a demo.

So – the FIRST template has info we need – CSS and JS to make everything work – you just need this once for any page. The light blue buttons are there just to show you what buttons look like in Dashboard (i.e. not as good as they could be) – and the three templates are the three new coloured buttons you see above right – which react to being pressed both visually and with haptic feedback.

Let’s take a look at the FIRST template which makes it all possible. It looks easy now but trust me it has taken some head scratching to get this far.

<style>
  .filled { 
      height: 100% !important;

      padding: 0 !important;
      margin: 0 !important;
  }
  .nr-dashboard-template {
      padding: 0;
      margin: 0;
  }
  
  .rounded {
  border-radius: 15px 15px 15px 15px;
  font-size: 18px;
}
  
</style>

<script>
$('.vibrate').on('click', function() {
  navigator.vibrate(100);
});

function restore_bg(x) {
            $(this).css("background-color", x);
    };

$('.touched').on('mousedown', function() {
    
    var x= $(this).css("background-color");
    $(this).css("background-color", "yellow");
    
    setTimeout(restore_bg.bind(this,x),200);
    navigator.vibrate(100);
    });
    
</script>

NOTE: At the time of writing this colour change works on Chrome etc on a PC and Android phone – it does NOT work on Firefox/Chromium on a Pi – this needs resolving.

The class FILLED is important - this is the one that gets rid of the padding that both buttons and template use by default - to make the button fill to the size of the template. nr-dashboard-template is also involved. None of this seems to affect other items on the screen.

ROUNDED is simply a means of forcing rounding on buttons - you can adjust that radius to suit or eliminate it if you like.

The scripts - well VIBRATE merely invokes the haptic feedback when you press a button - easy when you know how.

TOUCHED and it's associated restore function are variations on the ones I used with images. The class allows on press for a button to store it's colour - change it's colour - wait for a while - and change it back - all without having to have individual colour control on the actual button  - which simply has the default colour you select.

Now let's take a look at once of those templates. Oh and I got those subtle colours from here - https://flatuicolors.com/

<md-button class="vibrate filled touched rounded" style="background-color:#c0392b" ng-click="send({payload: 'Hello World'})"> 
    Red<br/>button
</md-button>

Simple? Yes because the previous code makes it so. A button in a template - auto stretched by the code above and all it has added is the background colour - which the above code can manipulate - and the classes. That's it. The ng_click is what happens when you press the button - the template outputs a payload of whatever you've set. No, really that is it.  so on that output, msg.payload will be whatever you set it to be.

With background colour control, RGB and related buttons become simple - a page full of colours for RGB controls becomes possible.  Note in the class ROUNDED I changed the font size - well you could separate that off to a separate class - and create classes (say) BIGTEXT and LITTLETEXT for example - suitable for different size buttons.

When you grasp this - if you're not there already, immediately all sorts of ideas should come to mind -it's a bit like opening a new door to see all the things behind it. Within days my demo screen will look utterly amateurish as I start adding icons etc but today was important as it was, for me a confirmation that there really is not a lot you can't do with node-red-dashboard – so many congratulations to the original developer and the guys at IBM and everyone contributing. 

If you go to the ANGULAR site and look at their examples - most of them work no problem - changing these rectangular buttons to round ones is a snap!

Oh, talking of improving things  - here’s a snapshot hours later as things progress…NICE!

new buttons

 

Oh – here… http://flows.nodered.org/flow/4bfad41290eda31588ff63a23815ac5c  - if you want a play…. and YES that template uses a little white space – but next Node-Red-Dashboard release it will NOT – css and scripts only will NOT use up screen real estate – all coming together VERY well right now.

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Node-Red Dashboard Thoughts

Or put another way – how to use Node-Red Dashboard without a mouse cursor or a menu – on a touch screen.

I’ve been playing with the touch-LCD screen on a Raspberry Pi – this was a Chinese one – quite cheap.. “5 inch HDMI LCD V2” – an 800*480 touch display with an XPT2046 Touch Controller.   It is lovely and works a treat for a resistive display - but it’s been sitting around for ages waiting for a use.

And now it has one running Node-Red-Dashboard – but I had a couple of issues..

Node-Red Dashboard with menu

So I had the Dashboard running wide-screen – full screen using Firefox.  One of my gripes was the mouse pointer in Firefox which I’m using on the Pi. I don’t want it on a touch-screen – well, I solved that by adding an empty template to the Dashboard with nothing more than a style in it.

* { cursor: none !important }

That gets rid of the mouse.  I needed to know how to get the Pi to open into Firefox automatically and full screen “kiosk” mode. I’m sure that’s easy and is referred to in the comments below. Right now I’m just selecting full screen – which is great – but not permanent.

The Dashboard now has the ability to let you change screens using a node – and you could trigger that from a button.

But by default you can’t get the touch-screen-unfriendly MENU out of the way – if you leave the menu title empty – you get an error – but here’s the daft thing – you get a menu even if you only have one page.

I asked if the guys at Node-Red if they would look at that – but thinking about it  -really that is NOT the answer – what is needed is to have the option to turn the menu OFF COMPLETELY while retailing the ability to switch paged via the NODE (the latter you can of course do). No point in having nice large buttons and still having to fiddle with the menu – I’d rather do my own NEXT and HOME large graphic buttons. For a wall display with that change, Dashboard would be GREAT.

Well, it turns out that one of our readers supplied the answer in a little more CSS – one line in fact, easily added to your code.

Note that this demo highlights an issue with Node-Red Dashboard – occasionally, for no apparent reason, the dark theme reverts to light – I only just noticed this while updating the blog!! I hope Dave is watching this!

 

Node-Red Dashboard with no menu

Anyway – how did I manage this – no menu, no annoying top bar – simple when you know how (Thanks Antonio).

<style>
   * { cursor: none !important }
   md-toolbar.md-default-theme:not(.md-menu-toolbar), md-toolbar:not(.md-menu-toolbar) {display: none;}
</style>
<div ng-bind-html="msg.payload"></div>

I have my little function node which gets rid of the mouse – and now looks like this.. Well, when the theming is restored, more like this…

Node-Red Dashboard

Another annoying thing I discovered was my nice, sparkly new screen timing out after a while – turns out it had nothing to do with the Dashboard but with Raspbian in this case.

A quick install..

sudo apt-get install xscreensaver

and then under accessories – one sees the screensaver option – and just turn it to NONE – and that’s THAT problem out of the way – my screen has now been up overnight.

And finally – if the BUTTONS are no good for you (the text does NOT wrap which is a pain) – here’s a button in a template – the button will be the full size of the template and you can put whatever text arrangement/icon/whatever in there. Well, I say that - the size of the template minus a rather over-the-top margin which I'm still working on.

<style>
  .filled { height: 100%; }
</style>
<md-button class="filled" style="background-color:red"   ng-click="send({payload: 'Hello World'})"> 
    Click<br/>me 
</md-button> 
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A Little Dashboard Something

tmp11D3Something for the weekend sir? How about a simple means to get visual and tactile feedback from node-red-dashboard buttons?

Or rather than large buttons – icons you may create or obtain yourself in a node-red-dashboard template.

To backtrack: For my own home control endeavours, I’ve been using a number of visual interfaces over time as some of you know – we’ve discussed in here – Imperihome and Blynk for example.

Recently I’ve been taking a look at Node-Red-Dashboard. Originally called Node-Red-Contrib-UI this has come a long way in recent months and I think is worth more investigation because of it’s ultimate flexibility.

I needed a set of controls for my thermostats – you’ll see an example in the image on the right. As well as turning heating up and down (and I have two separate systems for my office and home) – I have for some two years now had Node-Red handling 5 time-zones during the week and 5 at the weekend as well as frost fallback and holdoff controls (so we can turn the heating to frost setting if we pop out for the day (or for 6 months in one case)). Also as one of our properties is holiday rental, on the odd week it is not in use, it is handy to be able to stop down the heating for a few days, secure in the knowledge it will automatically turn back up when the time interval is done.

At the user end, I’ve used Imperihome for this and Blynk – and neither are ideal as I need so many controls.  Blynk controls are just too big and the slider values are not separately programmable – that is I can’t get them to show hours and minutes. Imperihome has controls for every imaginable device – but very few “generic” controls.

setup windowsThe Node-Red-Dashboard template has always been my favourite option but in the past seemed complicated and control over I/O was limited. Not any more. As you can see, it came to the rescue with a little coding. The standard  numeric up-down control in the dashboard is BORING with an awful pair of up-down arrows with no kind of feedback. History.

The controls you see here are my own effort – all in one template – and hence I have more control over the vertical spacing without which this would take several pages.

So – for any given control you are looking at programme time, temperature for that programme, up and down controls for the programme time and temperature. A feature of the template control (un-tick both arrows in the setup window) separates inputs from outputs – so you can fire information into the node and use that for display only – and buttons can fire values back out – but the standard buttons were WAY too big – so – I used images. Each section here is nothing more than a standard DIV with 3 spans – the final span holding four images.

<div layout="row" layout-align="space-between" style="padding:0px; text-align: left; margin:2px; border:2px solid black;">
<span style="width:28%;padding-top:5px;padding-left:5px;">{{"P1: "+ msg.payload.p1}}</span>
<span style="width:28%;padding-top:5px;padding-left:5px;">{{"T1: "+ msg.payload.t1 + "c"}}</span>
<span style="width:44%; padding-top:3px;">
    <img class="lightup" src="http://xx/icons/timed.png" ng-click="send({payload: 'p1dn' })" height="24px"/>&nbsp;
    <img class="lightup" src="http://xx/icons/timeu.png" ng-click="send({payload: 'p1up' })" height="24px"/>&nbsp;
    <img class="lightup" src="http://xx/icons/tempd.png" ng-click="send({payload: 't1dn' })" height="24px"/>&nbsp;
    <img class="lightup" src="http://xx/icons/tempu.png" ng-click="send({payload: 't1up' })" height="24px"/>
</span>
</div>

I’ve shortened the URL for the images (any old publically available place) to fit onscreen. I put them on my website in a folder called “icons”- but that’s arbitrary.

So – you’ll see the “moustaches” {{}} surrounding incoming information – my first ignorant thought when using one of these templates was that you were limited to msg.payload – but no you are not – you can send an entire object in there.  Hence the page is a series of the above DIVs. Each image (used as a button) sends out a unique message and a simple lookup table decides what to do with them.

template

So above, the blue template is the page you see up at the top – the output is passed to a function in which you can use a case statement to decide what you want to do with each button press.  The second function is triggered every couple of seconds and formats your various settings into an object for injecting into the function (in case these values are altered elsewhere, you want to see changes appear on your phone display). The output from the first function ALSO feeds that function so any changes you make with the buttons – once processed – show immediate changes in the values you see in the topmost image.

So – all very nice – press the anti-clockwise time or clockwise green images – the times change (in my case in 15 minute intervals but they are actually stored in minutes – hence the second function does a bit of formatting).

But it is all very boring – you get no visual feedback from the images – and no tactile feedback from the phone. Well, let me say that I’ve spent several hours going down blind alleys – and learned a lot today. The end result – visual “brightup” icons when you press them – AND full tactile “vibrate” feedback on mobile devices.

<script>
function restore_icon() {
        $(this).attr('src',$(this).attr('src').replace("_b.png",".png"));
    };

$('.lightup').on('mousedown', function() {
    $(this).attr('src',$(this).attr('src').replace(".png","_b.png"));  
    setTimeout(restore_icon.bind(this),500);
    navigator.vibrate(100);
    });
</script>

And it is SO easy once you know how.

It turns out you can use jQuery inside the templates – which is awfully handy – and a modern line to control the buzzer.

When you create or use a (.png) (transparent) image you want as a button – make another with a suffix “_b” for bright. The code below on press replaces the image with the bright version and shortly thereafter with the original.  At the same time the excruciatingly simple vibrate line makes the phone vibrate briefly.  You have no idea where I’ve been with this – but note it is a recent addition but modern phones and tablets should handle it.

Note the class=”lightup” in the above img definitions. Stick this code at the top of the template and all will work magically..

The second part of this code changes the image to the bright version and starts off a short vibrate – while setting a timer at the end of which – the original image is replaced. It is that simple. Because I don’t refer to the actual image – you can have several different images which will operate in the same way.

I’m no CSS expert but with a little care and reading up you can make a pretty control page all in one template completely under your control – and of course – making the alternative image brighter was just my idea – you may chose another path. “Blynk”-type controls should be a doddle.

Have a nice weekend.

 

Enjoy.

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