Interface MQ135 (Gas Sensor) with NodeMCU

#include "MQ135.h"
#define ANALOGPIN A0

MQ135 gasSensor = MQ135(ANALOGPIN);

void setup() {
// put your setup code here, to run once:
Serial.begin(115200);
}

void loop() {
// put your main code here, to run repeatedly:
float rzero = gasSensor.getRZero(); //this to get the rzero value, uncomment this to get ppm value
float ppm = gasSensor.getPPM(); // this to get ppm value, uncomment this to get rzero value
Serial.println(rzero); // this to display the rzero value continuously, uncomment this to get ppm value
Serial.println(ppm); // this to display the ppm value continuously, uncomment this to get rzero value
}

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