MH-Z19 is supporting PWM , but this library is supporting only serial connection. this library is testing only ESP-WROOM-02/32 (ESP8266/ESP32) boards. if you can't execute this library on your arduino ...

MH-Z14A Library Library for using the MH-Z14A CO2-Sensor with an Arduino over UART Methods and explanation can be found in /src/MH-Z14A.h In case of communication issues with the sensor, please first ...

While on the search for an alternative to directly buying the fairly expensive MH-Z19 CO2 sensor, [spezifisch] came across a ‘BreeRainz’ branded gadget (also found under other brands) t… ...

Arduino, on the other hand, offers prototyping boards not tailored for in-the-field deployments. Also, the boards are not specifically designed for ultra low power operation required for long-lasting ...