Adafruit_CircuitPython_CCS811

circuit python driver for CCS811 air quality sensor

Dependencies

This driver depends on the Register and Bus Device libraries. Please ensure they are also available on the CircuitPython filesystem. This is easily achieved by downloading a library and driver bundle.

Usage Notes

see here for wiring and installation instructions: https://learn.adafruit.com/ccs811-air-quality-sensor/circuit-python-example

Of course, you must import the library to use it:

import busio
import Adafruit_CCS811

The way to create an I2C object depends on the board you are using. For boards with labeled SCL and SDA pins, you can:

from board import *

You can also use pins defined by the onboard microcontroller through the microcontroller.pin module.

Now, to initialize the I2C bus:

myI2C = busio.I2C(SCL, SDA)

Once you have created the I2C interface object, you can use it to instantiate the CCS811 object

ccs =  Adafruit_CCS811.Adafruit_CCS811(myI2C)

Reading Sensor

To read the gas sensor and thermistor you can do the following:

if ccs.data_ready:
		temp = ccs.calculateTemperature()
		if not ccs.readData():
			print("CO2: ", ccs.eCO2, " TVOC:", ccs.TVOC, " temp:", temp)
		else:
			print("ERROR!")
			while(1):
				pass