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78. MQ-2 Gas Sensor : A friendly introduction

Hello everyone

Sorry I have not posted in a while. Today I am back with an interesting post. In this post, I will be explaining you about the MQ2 sensor and how to interface it with Arduino development board.

This Gas sensor is suitable for sensing LPG, Smoke, Alcohol, Propane, Hydrogen, Methane and Carbon Monoxide concentrations in the air. 

MQ-2 sensor

MQ2 is one of the commonly used gas sensors in MQ sensor series. It is a Metal Oxide Semiconductor (MOS) type Gas Sensor also known as Chemiresistors as the detection is based upon change of resistance of the sensing material when the Gas comes in contact with the material. Using a simple voltage divider network, concentrations of gas can be detected.

It can detect the gases and smoke anywhere from 200 to 10000ppm.

Specifications

  • Operating Voltage: 5V
  • Load Resistance: 20 kΩ
  • Heater Resistance: 33Ω ± 5%
  • Heating consumption: <800mW
  • Sensing Resistance: 10 kΩ – 60 kΩ
  • Concentration Scope: 200 – 10000ppm
  • Preheat Time: Over  24 hours

Pinout

  • GND - Ground
  • VCC - 5V
  • A0 - If you are going to use the analog output of the sensor, use this pin
  • D0 - If you are going to use the digital output of the sensor, use this pin but you must calibrate the sensor.

Follow my blog and stay tuned to learn more.
If you have any questions, please feel free to comment below.

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