Smoke Sensor (MQ2) board

Guru (talk) 10:06, 11 August 2015 (IST)

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Gas Sensor(MQ2) module is useful for gas leakage detecting(in home and industry). It can detect H2, LPG, CH4, CO, Alcohol, Smoke, Propane. Based on its fast response time.Measurements can be taken as soon as possible. The level can be set by the trim pot very precisely. It can be also directly connected to analog pin of Arduino to read analog values.

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Hardware Connections

How to use

There're two steps you need to do before getting the concentration of gas. First, connect the module with Arduino using A0 like the picture above. And put the sensor in a clear air and use the Calibration program.

• Calibration Code

Then, open the monitor of Arduino IDE, you can see some data are printed, write down the value of R0 and you need to use it in the following program. During this step, you may pay a while time to test the value of R0.

Second, put the sensor in one gas where the environment you want to test in. However, don't forget to replace the R0

• Final Code

Downloads

• Schematic
• Datasheet
• Arduino Code

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1 Blink a LED

Sandeep

Blinky, is your first experiment in the world of Arduino. Let's blink! We will connect a LED to pin 13 of Arduino and turn it ON/OFF every second. Sandeep (talk) 16:13, 4 March 2016 (IST...

2 Read Switch and Display on LED

Sandeep

Code

3 Make some noise with buzzer

Sharana

Code

4 Display colors with RGB LED

Sharana

Code