CCS811Tester

ccs811Test.py

#!/usr/bin/python3

import os
import smbus
import time

#On Rasbperry PI please install smbus via sudo apt install python3-smbus

ccs811Address  =  0x5A

ccs811StatusRegister = 0x00
ccs811MeasurementMode = 0x01
CCS811_ALG_RESULT_DATA = 0x02
ccs811MeasurementModeRegister = 0x01
CCS811_BOOTLOADER_APP_START = 0xF4
ccs811BaselineRegister = 0x11

i2cInterface = smbus.SMBus(1)


running = None
ressult = i2cInterface.read_byte_data(ccs811Address, ccs811StatusRegister)
if (ressult & 0b10000000) == 128:
	running = True
else:
	running = False
	print("Sensor not running")

if not running:
	print("Booting sensor")
	i2cInterface.write_i2c_block_data(ccs811Address, CCS811_BOOTLOADER_APP_START,[])



modus = i2cInterface.read_byte_data(ccs811Address,ccs811MeasurementModeRegister)
if modus != 0b00010000: 
	print("Sensor not in desired mode, changing")
	i2cInterface.write_byte_data(ccs811Address,ccs811MeasurementMode,0b00010000)
	time.sleep(0.1)

baseline= i2cInterface.read_i2c_block_data(ccs811Address, ccs811BaselineRegister, 2)
print("Baseline:", baseline)

ressult = i2cInterface.read_i2c_block_data(ccs811Address, CCS811_ALG_RESULT_DATA, 8)
eCO2 = ressult[0] * 256 + ressult [1]
TVOC = ressult [2] * 256 + ressult[3]
print ("eCO2: ", eCO2, " TVOC: ", TVOC)