33. MQ5 Gas Sensor

33.1. Introduction

MQ5 Gas sensor has a good sense to liquefied gas, natural gas and coal gas that are widely used in cities, but it doesn’t work on ethanol or smoke.

microbitplanetX\./images/05033_01.png

33.2. Characteristic


  • Designed in RJ11 connections, easy to plug.

33.3. Specification


Item Parameter
SKU EF05033
Connection RJ11
Type of Connection Analog output
Working Voltage 3.3V

33.4. Outlook


microbitplanetX\./images/05033_02.png

33.5. Quick to Start


Materials Required and Diagram


  • Connect the MQ5 Gas sensor to J1 port and the OLED to the IIC port in the Nezha expansion board as the picture shows.

microbitplanetX\./images/05033_03.png

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

33.6. MakeCode Programming


Step 1

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

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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.

../_images/05001_05.png

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.

Step 2

Code as below:

../_images/05033_06.png

Result

  • The value detected from MQ5 Gas sensor displays on the OLED screen.

33.7. Python Programming


Step 1

Download the package and unzip it: PlanetX_MicroPython

Go to Python editor

../_images/05001_072.png

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

../_images/05001_081.png ../_images/05001_091.png ../_images/05033_10.png

Step 2

Reference

from microbit import *
from enum import *
from co import *
co = CO(J1)
while True:
    display.scroll(co.get_co())

Result

  • The value detected from MQ5 Gas sensor displays on the micro:bit.

33.8. Relevant File


33.9. Technique File