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Available Languages
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Introduction
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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.
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.
What you will need - Hardware
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For this project you will need:
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The Circuit
The connections are pretty easy, see the image above with the breadboard circuit schematic.
- Vcc & GND pins of sensor --> Arduino GND
- Signal (middle pin) --> Arduino Pin 2
- 4.7K Resistor between signal pin and 5V pin
The code using Codebender
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | /* Testing MQ-2 GAS sensor with serial monitor Suitable for detecting of LPG, i-butane, propane, methane ,alcohol, Hydrogen or smoke More info: http://www.ardumotive.com/how-to-use-mq2-gas-sensor-en.html Dev: Michalis Vasilakis // Date: 11/6/2015 // www.ardumotive.com */ const int gasPin = A0; //GAS sensor output pin to Arduino analog A0 pin void setup() { Serial.begin(9600); //Initialize serial port - 9600 bps } void loop() { Serial.println(analogRead(gasPin)); delay(1000); // Print value every 1 sec. } |
Download the code from here and open it with Arduino IDE. Open the serial monitor from tools menu of Arduino IDE.
Now you can try this: Take a lighter and press the button to release gas near the sensor. Observe values on serial monitor. |
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Well done!
You have successfully completed one more Arduino "How to" tutorial and you learned how to use the MQ-2 Gas sensor with Arduino.
Tip: You can use this tutorial to read values from all MQ gas sensors (MQ-2, MQ-3, MQ-4, MQ-5, MQ-6, MQ-7, etc)
I hope you liked this, let me know in the comments.
Tip: You can use this tutorial to read values from all MQ gas sensors (MQ-2, MQ-3, MQ-4, MQ-5, MQ-6, MQ-7, etc)
I hope you liked this, let me know in the comments.
