the python code of Sensirion sensors for raspberry pi using smbus2

SGP40 and vocAlgorithm
https://github.com/DFRobot/DFRobot_SGP40

CLCD
https://github.com/bogdal/rpi-lcd

scd4x (tested on scd41)
sht3x (tested on sht31)
sfa30 (i2c mode, SEL pin should be GND.)
I2C frequency should be 100kHz (Default), SFA30's limitation.

for raspberry pi

1. enable i2c
2. sudo pip3 install smbus smbus2
3. sudo usermod -a -G dialout pi