31. MQ2 Gas Sensor¶
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.
Designed in RJ11 connections, easy to plug.
|Type of Connection||Analog output|
31.5. Quick to Start¶
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¶
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.
Code as below:¶
The value detected from MQ2 Gas sensor displays on the OLED screen.
31.7. Python Programming¶
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.
from microbit import * from enum import * from smoke import * smoke = SMOKE(J1) while True: display.scroll(smoke.get_smoke())
The value detected from MQ2 Gas sensor displays on the micro:bit.