# MQ2 Gas Sensor(EF05031) ## 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. ![](./images/05031_01.png) ## Products Link [ELECFREAKS PlanetX MQ2 Sensor](https://shop.elecfreaks.com/products/elecfreaks-planetx-mq2-sensor?_pos=1&_sid=04dea9287&_ss=r) ## Characteristic Designed in RJ11 connections, easy to plug. ## Specification Item | Parameter :-: | :-: SKU|EF05031 Connection|RJ11 Type of Connection|Analog output Working Voltage|3.3V ## Outlook ![](./images/05031_02.png) ## 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. ![](./images/05031_03.png) ***Note:*** A preheating for 3 minutes after powering on is required before using. ## MakeCode Programming ### Step 1 Click "Advanced" in the MakeCode drawer to see more choices. ![](./images/05001_04.png) 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/05031_06.png) ### Link Link: [https://makecode.microbit.org/_DeX9DA369Amq](https://makecode.microbit.org/_DeX9DA369Amq) You may also download it directly below:
### Result The value detected from MQ2 Gas sensor displays on the OLED screen. ## Python Programming ### Step 1 Download the package and unzip it: [PlanetX_MicroPython](https://github.com/lionyhw/PlanetX_MicroPython/archive/master.zip) Go to [Python editor](https://python.microbit.org/v/2.0) ![](./images/05001_07.png) 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_08.png) ![](./images/05001_09.png) ![](./images/05031_10.png) ### Step 2 ### Reference ``` from microbit import * from enum import * from smoke import * smoke = SMOKE(J1) while True: display.scroll(smoke.get_smoke()) ``` ### Result The value detected from MQ2 Gas sensor displays on the micro:bit. ## Relevant File ## Technique File