Power from NodeMCU, Wemos Mini D1 and Arduino
What must we take into account to supply external sensors and actuators?
MH-Z19B
The MH-Z19B CO2 Sensor Bible
The MH-Z19B CO2 sensor is fantastic, an inexpensive CO2 sensor, accurate for the price, and very easy to use.
In this article you will find everything you want to know about him.
A homemade CO2 meter with Wifi against the coronavirus. The CO2 Easy
Build your own CO2 meter easily in one afternoon