sensirion/makecode-extension-scd41

Sensirion SCD41 Makecode Extension

Makecode extension for the Sensirion SCD41 CO2 development board connected to the micro:bit platform.

This extension allows you to read CO2, temperature and relative humidity values with an interval of 5 seconds.

Supported Targets

• PXT/microbit
• Calliope mini

I2C Address

• 0x62

Usage

open your microbit makecode project, in "+ Extension", paste the following URL:

https://github.com/Sensirion/makecode-extension-scd41

Demo

API

Get CO2 value in ppm

function get_co2()

Get temperature in degree celsius. Takes an optional argument to change to fahrenheit.

function get_temperature()

Get relative humidity in percent

function get_relative_humidity()

Start measurement on SCD41 development board. This method will be automatically called on initialization. If you call stop_continuous_measurement() you have to call this method again before co2, temperature and humidity values can be retrieved again.

function start_continuous_measurement()

Stop measurement on SCD41 development board. After calling this function, no more sensor values can be read out anymore until you call start_continuous_measurement

function stop_continuous_measurement()

Hardware

License

MIT

Copyright (c) 2021, Sensirion AG

makecode-extension-scd41's Issues

i2c communication with CO2 sensor SCD41 (Sensirion) not working flawless

I tested the new evaluation kit from Sensirion with the MicroBit: library , it works like a charm, CO2, humidity and temperature can be read continuously.
When I tried to run the same library with the Calliope, I was able to read CO2 values but not reliably, sometimes a 0 value would be indicated. Temperature and humidity values could not be read at all, for temperature the reading shows -44° C for humidity 0.