Arduino code for the SmarThermostat, a set of environmental sensors and relays coupled to an Adafruit HUZZAH ESP8266.
The SmarThermostat gets temperature, pressure, and humidity information from a BME80 sensor and light level information from a TSL2561 sensor, which it reports back to the home automation server via MQTT (using the topic environment//data ). It receives commands - and, on request, reports current settings - to change the settings of the relays controlling the fan, furnace, and air conditioning unit over the topics environment/central/command and environment/central/status , respectively, and actions them accordingly.
A secondary routine flashes LED 0 on the Feather flash periodically to indicate normal function.
The code for the SmarThermostat is freely available under the MIT License, should you happen to want it.