Power from NodeMCU, Wemos Mini D1 and Arduino
What do we need to consider when powering external sensors and actuators?
MH-Z19B
The CO2 sensor bible MH-Z19B
Discover all the secrets of the MH-Z19B CO2 sensor in one place. An inexpensive, accurate (for the price) and very easy to use CO2 sensor.
A home CO2 meter with Wifi against the coronavirus: The CO2 Easy
Easily build your own quality CO2 meter in an afternoon