I was just getting settled into my new office when BANG – a flood –not the global warming type but the crappy plumber type. So – right now the place is a bombsite and we’re sleeping elsewhere at least for tonight – indeed could be longer if they can’t get the water partly running.
Meanwhile a couple of items turned up in the post this morning which might interest you. Firstly I’ve been looking for small movement sensors – most of them are WAY too bulky – and I picked up a couple of these IR movement sensors from Banggood! 3 for a fiver. You can see how small the thing is comparing it to my normal size hand!
I already have a larger and slightly more obnoxious sensor inside. I need to put a light sensor in as well because I have lights coming on in my office during the day when it’s just not necessary.
So tonight I decided to give it a go (I have half the mains on – including my office which fortunately has electric heat). I hooked one of the units up to 5v and ground – (the outputs are ground, output and 5v in that order. Ground is obvious – lots of tracking and a minus sign). I hooked a LED to the output, switched on and… zilch.
Fortunately a little while ago I was fortunate enough to become the owner of a little NSCOPE – a USB low-bandwidth scope with breadboard – a wonderfully useful gadget. Well, that WORKED and on close inspection they have a 20k resistor in series with the output – clearly not meant for a LED but just fine for an ESP8266 or Arduino. The units pick up movement several metres away and at a range of angles… I’m thinking…. hole in the door frame – unit inserted in there somewhat recessed to reduce it’s angle of operation… picks up people near the door….
Meanwhile, one of the other competitors on the esp826.com annual ESP8266 competition (which I do not expect to win – mine is item 75 – vote if you like it) send me one of his units – it’s called a ZMOTE – a neat little infra-red learning remote.
I’ve not gone into it yet due to the flooding but you can find out about it on the ESP8266.COM website – I’ll do a write-up when I’m not running around with buckets.