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.


30.3. Characteristic#

Designed in RJ11 connections, easy to plug.

30.4. Specification#

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

30.5. Outlook#


30.6. Quick to Start#

30.6.1. 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.


30.7. MakeCode Programming#

30.7.1. 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.

30.7.2. Step 2#

30.7.3. Code as below:#


30.7.5. Result#

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

30.8. Python Programming#

30.8.1. 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

30.8.2. Step 2#

30.8.3. Reference#

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

30.8.4. Result#

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

30.9. Relevant File#

30.10. Technique File#