Sensors

Interfacing MQ-135 Smoke Gas Sensor Module with Arduino

Written by Mohammad Damirchi

MQ-135 Smoke Gas Sensor Module Features

MQ series sensor uses a small heater inside with an electrochemical sensor in order to measure different kinds of gas combinations. The MQ-135 sensor is a sensor for detecting air quality. This sensor is able to detect smoke, CO2, ammonia, alcohol and benzene in the air.

Note

After turning on the module, wait for 2 minutes until the inside heater warms up.

You can download the datasheet of this module here.

MQ-135 Smoke Gas Module Datasheet

1 file(s) 149.74 KB

Download

MQ-135 Sensor Pinout

This sensor has 4 pins:

5V: Module power supply – 5 V
GND: Ground
DOUT: Digital output
AOUT: Analog output

You can see pinout of this module in the image below.

Required Materials

Hardware Components

Arduino UNO R3	×	1
MQ-135 Air Quality Sensor Module	×	1
Male to Female jumper wire	×	1

Software Apps

Arduino IDE

Interfacing MQ-135 Sensor with Arduino

Step 1: Circuit

The following circuit shows how you should connect Arduino to MQ-135 module. Connect wires accordingly.

Step 2: Code

Upload the following code to your Arduino.

/*
  modified on Sep 28, 2020
  Modified by MohammedDamirchi from Arduino Examples
  Home
*/

// the setup routine runs once when you press reset:
void setup() {
  // initialize serial communication at 9600 bits per second:
  Serial.begin(9600);
}

// the loop routine runs over and over again forever:
void loop() {
  // read the input on analog pin 0:
  int sensorValue = analogRead(A0);
  // print out the value you read:
  Serial.println(sensorValue);
  delay(20);
}

After uploading the code, you can see the output in serial monitor.

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Interfacing MQ-135 Smoke Gas Sensor Module with Arduino