SwitchDoc Labs Air Quality Sensor Extender Kit Drivers for ESP8266
Designed for SwitchDoc Labs OurWeather, but works with Raspberry Pi, Arduino and ESP8266.
Version 1.0
April 2016
Note: Some ESP8266 modules are wired backwards (4 is 5 and 5 is 4). It this doesn't work, try the other way
Wire.begin(4, 5);
OR
Wire.begin(5, 4);