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.


31.3. Characteristic#

Designed in RJ11 connections, easy to plug.

31.4. Specification#

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

31.5. Outlook#


31.6. Quick to Start#

31.6.1. 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.

31.7. MakeCode Programming#

31.7.1. 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.

31.7.2. Step 2#

31.7.3. Code as below:#


31.7.5. Result#

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

31.8. Python Programming#

31.8.1. 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

31.8.2. Step 2#

31.8.3. Reference#

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

31.8.4. Result#

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

31.9. Relevant File#

31.10. Technique File#