31. MQ2 Gas Sensor(EF05031)

31.1. Introduction

MQ2 Gas sensor 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 and smoke.


31.2. Characteristic

  • Designed in RJ11 connections, easy to plug.

31.3. Specification

Item Parameter
SKU EF05031
Connection RJ11
Type of Connection Analog output
Working Voltage 3.3V

31.4. Outlook


31.5. Quick to Start

31.5.1. Materials Required and Diagram

  • Connect the MQ2 Gas sensor to J1 port and the OLED to the IIC port in the Nezha expansion board as the picture shows.


Note: A preheating for 3 minutes after powering on is required before using.

31.6. MakeCode Programming

31.6.1. Step 1

Click “Advanced” in the MakeCode drawer to see more choices.


We need to add a package for programming, . Click “Extensions” in the bottom of the drawer and search with “PlanetX” in the dialogue box to download it.


Note: If you met a tip indicating that the codebase will be deleted due to incompatibility, you may continue as the tips say or build a new project in the menu.

31.6.2. Step 2

31.6.3. Code as below:


31.6.5. Result

  • The value detected from MQ2 Gas sensor displays on the OLED screen.

31.7. Python Programming

31.7.1. Step 1

Download the package and unzip it: PlanetX_MicroPython

Go to Python editor


We need to add enum.py and smoke.py for programming. Click “Load/Save” and then click “Show Files (1)” to see more choices, click “Add file” to add enum.py and smoke.py from the unzipped package of PlanetX_MicroPython.

../_images/05001_081.png ../_images/05001_091.png ../_images/05031_10.png

31.7.2. Step 2

31.7.3. Reference

from microbit import *
from enum import *
from smoke import *
smoke = SMOKE(J1)
while True:

31.7.4. Result

  • The value detected from MQ2 Gas sensor displays on the micro:bit.

31.8. Relevant File

31.9. Technique File