40. MQ3 Gas Sensor Brick(EF04060)

40.1. Introduction

The gas sensitive material used in the MQ-3 gas sensor is tin dioxide (SnO2), which has a low conductivity in clean air. While the sensor being put in an environment that exists the alcohol vapor, the electrical conductivity of the sensor increases as the concentration of alcohol gas in the air increases.

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40.3. Characteristics

Standard 3-pin GVS port is easy to plug.

40.4. Specification

Item | Parameter :-: | :-: SKU|EF04060 Connections Type|Analog Pins Definition|S-Sigal V-VCC G-GND Working Voltage|3V Size|38x27mm

40.5. Outlook and Dimension

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40.6. Quick to Start

Materials required and connections diagram

Connect to P1 port as the picture shows.

Take iot:bit for example

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Note： Due to the high power consumption, powering with the USB wires from the breakout board(you can use our IoT:bit or Wukong breakout board) is required.

Program as the picture shows

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Reference

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

You can also download it directly below:

Result

Preheat it for 3 minutes after connections, detect the alcohol gas by approaching the probes to the gas while the returned value is almost stable. With the change of the alcohol gas’s concentration, the returned value gets bigger with the growing of it.

40.7. Revelent Case

40.8. Technical File