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Finding Rzero

#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);
}