How to Use MQ-135 to Detect Gases

In this tutorial, you will learn how to detect gas with an MQ-135 sensor and an Arduino.

Parts Required

  • Arduino
  • MQ-135 Gas Sensor
  • Jumper wires
  • Breadboard

Circuit

MQ-135 Air Quality Sensor Tutorial | Microcontroller Tutorials

To use the LED connect it to digital pin 13.

Code

int sensorValue;
int digitalValue;
void setup()
{

Serial.begin(9600); // sets the serial port to 9600
pinMode(13, OUTPUT);
pinMode( 3, INPUT);

}


void loop()

{

sensorValue = analogRead(0); // read analog input pin 0

digitalValue = digitalRead(2); 
if(sensorValue>400)
{
digitalWrite(13, HIGH);
}
else
digitalWrite(13, LOW);
Serial.println(sensorValue, DEC); // prints the value read
Serial.println(digitalValue, DEC);

delay(1000); // wait 100ms for next reading

}

References

[1] https://microcontrollerslab.com/interfacing-mq-135-gas-sensor-arduino/

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