30. CO2 Gas Sensor(EF05030)

30.1. Introduction

The higher the CO2 concentration is, the lower the output voltage would be. The CO2 probe is made with industrial grade which is high allergic to CO2 and anti-interference to alcohol and CO.


30.2. Characteristic

  • Designed in RJ11 connections, easy to plug.

30.3. Specification

Item Parameter
SKU EF05030
Connection RJ11
Type of Connection Analog output
Working Voltage 3.3V

30.4. Outlook


30.5. Quick to Start

30.5.1. Materials Required and Diagram

  • Connect the CO2 sensor to J1 port and the OLED to the IIC port in the Nezha expansion board as the picture shows.


30.6. MakeCode Programming

30.6.1. 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.

30.6.2. Step 2

30.6.3. Code as below:


30.6.5. Result

  • The detected value of the CO2 Gas sensor display on the OLED screen.

30.7. Python Programming

30.7.1. Step 1

Download the package and unzip it: PlanetX_MicroPython

Go to Python editor


We need to add enum.py and CO2.py for programming. Click “Load/Save” and then click “Show Files (1)” to see more choices, click “Add file” to add enum.py and CO2.py from the unzipped package of PlanetX_MicroPython.

../_images/05001_081.png ../_images/05001_091.png ../_images/05030_10.png

30.7.2. Step 2

30.7.3. Reference

from microbit import *
from enum import *
from co2 import *
co2 = CO2(J1)
while True:

30.7.4. Result

  • The detected value of the CO2 Gas sensor display on the micro:bit.

30.8. Relevant File

30.9. Technique File