37. MQ2 Analog Gas Sensor Brick

37.1. Introduction

The analog gas sensor - MQ2 is used in gas leakage detecting equipments in consumer and industry markets, this sensor is suitable for detecting LPG, i-butane, propane, methane ,alcohol, hydrogen, smoke. It is of high sensitivity and fast response, the sensitivity can be adjusted by the potentiometer.

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37.2. Characteristics


  • Standard 3-pin GVS port is easy to plug.

37.3. Specification


Item Parameter
SKU EF04028
Connections Type Analog
Pins Definition S-Sigal V-VCC G-GND
Working Voltage 5V
Size 38x27mm

Size:

37.4. Outlook and Dimension


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37.5. Quick to Start


Materials required and connections diagram


  • Connect to P1 port as the picture shows.

Take sensor:bit for example

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Program as the picture shows

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Reference

Link:https://makecode.microbit.org/_KJVXj9Co2UXU

You can also download it directly below:

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Result

  • Preheat it for 10 minutes after connections, detect the smoke by approaching the probes to the smoke while the returned value is almost stable.

  • With the change of the smoke, the returned value gets bigger with the growing of the smoke concentration.

37.6. Relevant Cases


37.7. Technical File