Measuring oxygen and carbon dioxide in air

Projects General Guidance
1

Hello forum,

I want to make a logger that will measure the O2 and CO2 levels in an enclosed space. DFRobot has a CO2 sensor which looks fairly decent, but I cannot find something similar that measures O2 levels.

Does anyone know of something like this? Or can one calculate the O2 content when you have the CO2 levels?

Thanks
Hein

2

Wonder why my Google search returned one as the first item, but your search did not?

Paul

3

I'm looking for an enclosed unit like the DFRobot CO2 sensor I mentioned in my first post. (Gravity: UART Non-dispersive Infrared Carbon Dioxide Sensor (0-50000 ppm) - DFRobot)

I'm not after the cheapie open circuit board type sensors that google no doubt threw out as your first result.

But thanks for your habitual sarcasm.

4

heinburgh:
I'm looking for an enclosed unit like the DFRobot CO2 sensor I mentioned in my first post. (https://www.dfrobot.com/product-1565.html)

I'm not after the cheapie open circuit board type sensors that google no doubt threw out as your first result.

But thanks for your habitual sarcasm.

No link in your first post. Notice the 85ma current draw for the device. Lots of O2 sensors use 20ma current loop.

Paul

5

The same company has an O2 sensor: https://www.winsen-sensor.com/sensors/o2-sensor/me2-o2.html

6

Or can one calculate the O2 content when you have the CO2 levels?

No.