Saturday, 9 July 2016

Wireless things temperature sensors, LLAP and the house of the future.


ESP8266 Woes

I have spent a large amount of time trying to get the ESP8266s to sleep. I have this problem:
http://www.esp8266.com/viewtopic.php?f=32&t=6763

I've tried to ground the pins as discussed in that thread. Given that the batteries last two to three weeks, the debugging is frustratingly long. I wanted to look at other alternatives.

The Alternative

I looked again at Ciseco's / Wireless Things range again. They are powered by a CR2032, and cost £10 - slightly more expensive than an ESP8266, but are boxed, reliable and portable:

https://www.wirelessthings.net/wireless-temperature-sensor
This is attached to a Pi and is used to convert the 868MHz LLAP output to HTTP requests.
https://www.wirelessthings.net/slice-of-radio-wireless-rf-transciever-for-the-raspberry-pi

Django then places these into redis entries for use by the thermostat. These work really well, are very easy to setup and very simple to integrate.

https://github.com/tommybobbins/PiThermostat

Here are the output voltages for just over two weeks:



Here are the temperatures over this time. There are 6 Wireless things sensors: Attic, Barabbas, Damocles, Icarus (inside) and Eden, Heimdall (outside). Forno is a TMP102 sensor attached to a Raspberry Pi inside a metal cased CCTV camera and so gets artificially hot.


I will post further results after a few months.

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