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. Products Link

ELECFREAKS PlanetX MQ2 Sensor

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:

31.7.4. Link

Link: https://makecode.microbit.org/_DeX9DA369Amq

You may also download it directly 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.

31.8.2. Step 2

31.8.3. Reference

from microbit import *
from enum import *
from smoke import *
smoke = SMOKE(J1)
while True:
    display.scroll(smoke.get_smoke())

31.8.4. Result

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

31.9. Relevant File

31.10. Technique File