30. CO2 Gas Sensor

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.

microbitplanetX\./images/05030_01.png

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


microbitplanetX\./images/05030_02.png

30.5. Quick to Start


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.

microbitplanetX\./images/05030_03.png

30.6. 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/05030_06.png

Result

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

30.7. 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 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

Step 2

Reference

from microbit import *
from enum import *
from co2 import *
co2 = CO2(J1)
while True:
    display.scroll(co2.get_co2())

Result

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

30.8. Relevant File


30.9. Technique File