Erriez MH-Z19B/C CO2 sensor library for Arduino This is a MH-Z19B / MH-Z19C CO2 sensor library for Arduino. It has been built from scratch to support hardware and software serial with a small ...

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 ...