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7 reasons your check engine light comes back on after being reset

A check engine light that returns after being reset means the underlying fault has not been repaired, only cleared from the vehicle’s diagnostic memory. The OBD-II system monitors engine and emissions ...
GitHub

We present a unified library for MQ sensors, this library allows to read MQ signals easily from Arduino, Genuino, ESP8266, ESP-32 boards whose references are MQ2, MQ3, MQ4, MQ5 ...

//Include the library #include <MQUnifiedsensor.h> /*****Hardware Related Macros*****/ #define Board ("Arduino UNO") #define Pin (A4) //Analog input 4 of your arduino ...