The below code is used to get the Rzero value of a particular MQ135 sensor, this is the resistance of the sensor in the presence of clean air.

Finding_Rzero.ino

#include "MQ135.h"
const int ANALOGPIN=A0;
MQ135 gasSensor = MQ135(ANALOGPIN);
void setup(){
  Serial.begin(9600);      // sets the serial port to 9600
}
void loop(){
  float rzero = gasSensor.getRZero();
  Serial.println(rzero);
  delay(1000);
}

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