adafruit-circuitpython-sgp40 1.1.0

CircuitPython library for the Adafruit SGP40 Air Quality Sensor / VOC Index Sensor Breakouts

Introduction

CircuitPython library for the Adafruit SGP40 Air Quality Sensor / VOC Index Sensor Breakouts

Dependencies

This driver depends on:

• Adafruit CircuitPython
• Bus Device
• Register

Please ensure all dependencies are available on the CircuitPython filesystem. This is easily achieved by downloading the Adafruit library and driver bundle.

Installing from PyPI

On supported GNU/Linux systems like the Raspberry Pi, you can install the driver locally from PyPI. To install for current user:

pip3 install adafruit-circuitpython-sgp40

To install system-wide (this may be required in some cases):

sudo pip3 install adafruit-circuitpython-sgp40

To install in a virtual environment in your current project:

mkdir project-name && cd project-name
python3 -m venv .env
source .env/bin/activate
pip3 install adafruit-circuitpython-sgp40

Usage Example

import time
import board
import adafruit_sgp40

i2c = board.I2C()  # uses board.SCL and board.SDA
sgp = adafruit_sgp40(i2c)

while True:
    print("Measurement: ", sgp.raw)
    print("")
    sleep(1)

For humidity compensated raw gas readings, we’ll need a secondary sensor such as the bme280

import time
import board
import adafruit_sgp40
import adafruit_bme280

i2c = board.I2C()  # uses board.SCL and board.SDA
sgp = adafruit_sgp40.SGP40(i2c)
bme280 = adafruit_bme280.Adafruit_BME280_I2C(i2c)

while True:
    temperature = bme280.temperature
    humidity = bme280.relative_humidity
    compensated_raw_gas = sgp.measure_raw(temperature = temperature, relative_humidity = humidity)
    print(compensated_raw_gas)
    print("")
    time.sleep(1)

Contributing

Contributions are welcome! Please read our Code of Conduct before contributing to help this project stay welcoming.

Documentation

For information on building library documentation, please check out this guide.