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Sensirion SGP40 VOC Sensor I2C driver for MicroPython

Sensirion SGP40 is a digital VOC (volatile organic compound) sensor. This is a I2C driver written in Python 3 for MicroPython.

Getting Started

Prerequisites

  • Sensirion SGP40 Sensor Module
  • MicroPython board with I2C interface

Wiring

Wire the I2C bus to the I2C bus on your MicroPython board. This is an example using the Pyboard D:

Pyboard SGP40
X15 (3V3) VDD
X14 (GND) GND
X9 SCL
X10 SDA

Usage

This example reads the measurements in a continous loop:

import time
from machine import I2C, Pin
from sgp40 import SGP40

i2cbus = I2C(1)
sgp40 = SGP40(i2c, 0x59)

while True:
    sgp40.measure_raw()
    time.sleep(1)

This returns raw data from the sensor. The data is meant to be processed by the Sensirion specific VOC Algorithm, which returns air quality reflected by an index.

Built With

License

This project is licensed under the MIT License - see the LICENSE file for details

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MicroPython I2C driver for SGP40 VOC sensor module

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