How to use MQ2 Gas Sensor – Arduino Tutorial




The MQ series of gas sensors use a small heater inside with an electro-chemical sensor. They are sensitive for a range of gasses and are used indoors at room temperature. The output is an analog signal and can be read with an analog input of the Arduino.

The MQ-2 Gas Sensor module is useful for gas leakage detecting in home and industry. It can detect LPG, i-butane, propane, methane ,alcohol, hydrogen and smoke.

Some modules have a built-in variable resistor to adjust the sensitivity of the sensor.

Note: The sensor becomes very hot after a while, don’t touch it!

In this tutorial we will use the serial monitor of Codebender (or Arduino IDE) to see how the sensor acts in variable gasses.

So, let’s get started!

Step 1: What you will need

For this tutorial you will need:

  • Arduino uno
  • Breadboard
  • MQ-2 Gas sensor module
 How to use MQ2 Gas Sensor - Arduino Tutorial

Step 2: The Circuit

The connections are pretty easy:

  • Vcc to Arduino 5V pin
  • GNG to Arduino GND pin
  • Output to Arduino Analog A0 pin

Note: The sensor becomes very hot after a while, don’t touch it!

Step 3: The Code

Here’s the code, embedded using Codebender!

Try downloading the codebender plugin and clicking on the Run on Arduino button to program your Arduino with this sketch. And that’s it, you’ve programmed your Arduino board! Press connect button to start serial communication with your Arduino board.

Now you can try this:

Take a lighter and press the button to release gas near the sensor. Observe values on serial monitor.

 

For more detail: How to use MQ2 Gas Sensor – Arduino Tutorial




Current Project / Post can also be found using:

  • mq2 sensor simulation using proteus
  • gas sensor for use with pic
  • gas sensor proteus simulation project
  • how mq2 sensor communicate to pic16f877a

Leave a Comment

*
= 4 + 3

Scroll to top