Dobrica Pavlinušić's random unstructured stuff

CJMCU-811: Revision 3

CJMCU-811 CCS811 Carbon Monoxide CO VOCs Air Quality Digital Gas Sensor

https://revspace.nl/CJMCU-811

^ pins

VCC this is directly connected to the IC (there is no voltage regulator on board), connect this to 3.3V
GND to ground obviously
SCL signal from I2C
SDA signal from I2C
WAK this needs to be low (!) in order for the chip to be active
INT can be left unconnected
RST can be left unconnected
ADD can be left unconnected. It has a 10k pull-down to GND, setting the I2C address to 0x5A.

^ firmware upgrade

https://github.com/maarten-pennings/CCS811/tree/master/examples/ccs811flash

.pre
dpavlin@nuc:~/Arduino/libraries$ git clone https://github.com/maarten-pennings/CCS811

.pre

Wiring for ESP8266 NodeMCU boards: VDD to 3V3, GND to GND, SDA to D2, SCL to D1, nWAKE to D3 (or GND)