Monthly Archives: June 2017

OTA

A quick note – I have made all of my sites secure (https://) and so the original OTA site for my ESP8266 ROMS (www.scargill.net) is no longer appropriate.   roms.scargill.net  is now the place to go (which redirects elsewhere and also has a pretty interface)  –   sorry for any inconvenience. The files are not seen if you visit the site, just a home page - you simply enter the name of the site followed by slash and the rom name - for example...  roms.scargill.net/rom.bin

Files available are:

blank.bin

esp_init_data_default.bin

rboot.bin

rom.bin

romx.bin

blank.bin and esp_init_data_default.bin are needed for utterly blank ESP12 units.

rboot.bin and rom.bin are for my new ESP8266 code (which no longer supports ESP-01)

rboot.bin and romx.bin are for my older ESP8266 code (no longer developing that version but it is fine and might run fine on an ESP-01 without OTA)

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Today’s Mailbag

I have to say, it felt a little like Christmas today when the Correos post-lady turned up with a plastic container full of packages from China for me.

Wemos

Among the many items in today’s post were the two you see above – a WEMOS board (i.e.  ESP-12 + power supply) which includes an OLED display. As you’ll know I’ve recently added the SD1306 display to the commands on my ESP8266 code – looks like they’ve done the same but gone a stage further and added the actual display to the board.

(While I'm here - note the site is now https:// rather than http://  - if anyone has issues (despite refreshing the browser) - do please let me know.

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Fonts Galore

In recent previous articles I’ve been working with various displays and various processors – and one thing that comes to the fore is the importance of fonts. TTF fonts are pretty useless for small microprocessor projects as the processing overhead can be significant – and though there are many standards out there – if you want to do this all without spending money – choices are limited. In addition to that, when it comes to icons – the chances of finding a readymade font with all the stuff you need and none of the stuff you don’t need – are pretty slim.

fonts

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SSD1306 on ESP8266

I recently completed some work on the 240*320 ILI-based boards on my kitchen-sink ESP8266 code which is designed to work with the home control system but basically is an ESP8266 board that responds to MQTT commands.

I’m very pleased with the display code but it came to my attention that the price has gone up recently – £4 - £7 depending where you go.  So having completed some work on the tiny but beautiful 128x32 OLED displays which are DIRT cheap, (see also the 64 pixel versions)  I thought I’d revisit the ESP code which already supports a number of I2c peripherals including my new Nano peripheral – and added in the SSD1306.

SSD1306

Continue reading SSD1306 on ESP8266

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Silence of the Lambs

I’ve spent WAY too many hours working on ILI9340 display updates for my ESP8266  kitchen sink C code but at least now I'm getting somewhere - that is - fast, easy serial or MQTT access to the display with multiple fonts.  Note - that initial tests indicate this also applies to the ILI9341 -  just over £5 from Ebay at the time of writing (Aug 2017) - https://goo.gl/DHACMwDisplay I got sick of trying to find decent fonts in bitmap mode (most of them look like something out of the 1990s) and decided the only way was to go GCLD – which is a relatively simple format with the advantage that there is a free Windows convertor/editor which takes in any old TTF font – of which there are millions – and converts them. Little did I know how many hours I'd need to put into making it work.

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ESP8266 Home Control Update

As the blog entry on using my home control code ROMS for ESP8266 is filling up and of course as much of the information is now dating I thought I’d do a new blog to bring everyone up to speed and move the conversation to this blog entry. The good news is  - the code is now running under SDK 2.1.0 – i.e. bang up to date at the time of writing.

Home Control 2017

Firstly – yes, everything works – but the procedure for flashing ESP-12 etc has changed ever so slightly. I have updated the binary files to run on Espressif SDK 2.1.0 and updated the RBOOT code I use for OTA (over-the-air updating) to the latest version.

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Mongoose OS

Mongoose OS is an open source Operating System for the IOT, supporting ESP32, ESP8266, STM32, TI CC3200 (Amazon AWS IoT integrated). Code in C or JavaScript.  Time to give it a go! Updated (gutted) June 02, 2017.

Some time ago I tested Mongoose OS, early days and I had a lot of difficulties.  This blog is a partial re-write because I see no reason to leave information lying around that is well out of date – there is a lot of that on the web already – and the current setup is MUCH easier to use than before.  I have to tell you that the version changed as I was writing this so make sure you have the latest mos.exe

Continue reading Mongoose OS

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