With this library you can read out the VOC index from the Sensirion SGP 40 Sensor.

Installation: Connect the Sensirion SGP40 sensor to the Raspberry Pi.

• GND
• VDD
• SDA
• SCL

note that I2c is switched on on your Raspberry Pi.

Attention. if you sudo i2cdetect -y 1 the sensor will not be displayed. this does not mean that the sensor is not working.

Download the files and run sudo python3 example_sgp40_voc_index.py the allgerutmuss now calculates with a default value of 50 %rh and 25°C

To achieve a more realistic accuracy you can connect a SHT30 sensor and run sudo example_sgp40_and_sht30_voc_index.py You can of course also use another temperature and humidity sensor. To do this, change sgp40.set_envparams() in the loop