MQ3 Gas Sensor Brick(EF04060)
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.
Products Link
ELECFREAKS Octopus MQ3 Gas Sensor Brick
Characteristics
Standard 3-pin GVS port is easy to plug.
Specification
| Item | Parameter |
|---|---|
| SKU | EF04060 |
| Connections Type | Analog |
| Pins Definition | S-Sigal V-VCC G-GND |
| Working Voltage | 3V |
| Size | 38x27mm |
Outlook and Dimension
Quick to Start
Materials required and connections diagram
Connect to P1 port as the picture shows.
Take iot:bit for example
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
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.