CJMCU-811

Project CJMCU-811
Playing around with a breakout board for the CSS-811 IC
Status	Initializing
Contact	bertrik
Last Update	2018-12-30

Introduction

I bought this board from Aliexpress, it's a breakout board for the AMS CCS-811. The CCS-811 is an ultra-low power digital gas sensor for monitoring indoor air quality.

The datasheet can be found here.

Hardware

Pins on the breakout board:

• 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 (?)

My board was apparently configured at I2C address 0x5A. I'm wiring it up to a Wemos D1 mini board with an ESP8266.

Software

I found two libraries:

• Adafruit CCS811 Library
• SparkFun CCS811 Arduino Library

It looks like the Sparkfun is the most useful of the two.

Application to air quality monitoring at RevSpace

A sensor like this could be used to monitor indoor air quality at Revspace.

In general, we could monitor the air quality of the main room (for example).

In particular, we could use a sensor like this to monitor emissions from our 3d printers or our laser cutter.

Some reading material:

• Sara HÖgdahl, "Placing VOC Sensors for Assessing Air Quality - A CFD Study of Indoor VOC Distribution", MJ243X Degree project in Sustainable Buildings, second level, 2018-06-13, Stockhom.
• Ultrafine particles from 3d printing: https://www.3ders.org/images2016/new-study-shows-that-3d-printing-in-confined-spaces-can-be-bad-for-your-health-3.jpg
• Volatile organic compounds from 3d printing: https://www.3ders.org/images2016/new-study-shows-that-3d-printing-in-confined-spaces-can-be-bad-for-your-health-4.jpg