3 ms·

This library is for the RAD-0301 meter, marketed as a the co2meter.com mini CO2 meter. I don't know if it works with any other models but as I have one of these

This library is for the RAD-0301 meter, marketed as a the co2meter.com mini CO2 meter. I don't know if it works with any other models but as I have one of these, I can tell you it works from my linux machines. You're probably going 'Wow that's expensive for a CO2 meter when I can goto Aliexpress and get one for $10!' This is actually pretty cheap for a NDIR sensor which is what one should use for CO2 monitoring. The cheapo $10 sensors are all VOC sensors that require calibration and can be affected by airborne pollutants like alcohol. I believe this is only 100ppm accuracy, the 5-10ppm resolution sensors are many hundreds of dollars. It's fine enough for casual air quality measurements.

petsfed 7y ago
The core device is typically on the order of $50-$150 US, but with many of the sensors that CO2meter sells, you're also getting a microcontroller, display, power supply, etc. You'll frequently find temperature and humidity sensors and also barometric pressure sensors rolled into that, since NDIR is affected by all those things. So the price of a good, fully realized NDIR CO2 meter is comparable with any low-volume, moderate precision, moderate complexity electronic device.
Klinky 7y ago
Andreas Spiess has a good video on VOC vs CO2 sensors. https://www.youtube.com/watch?v=FL0L-nic9Vw https://www.youtube.com/watch?v=FL0L-nic9Vw
- Rebelgecko 7y ago
  His channel is a goldmine for anyone who plays around with ESP-32 microcontrollers or similar devices
Hasz 7y ago
For $20, you can get the MH Z-19, which is a NDIR type. You can talk to it over UART, and it comes in a 5000ppm and 2000ppm model IIRC. Decent documentation, and a good little sensor. The S8-0053 looks interesting, but I have no experience with it. Also NDIR, boasts +- 40ppm accuraxy -- the room air might not even be that homogeneous... The cheap ones are electrochemical, and they're not even that cheap. https://sandboxelectronics.com/files/SEN-000007/MG811.pdf https://sandboxelectronics.com/files/SEN-000007/MG811.pdf
- polskibus 7y ago
  Problem with it is that it autorecalibrates itself every 24hrs as far as I remember. It is a problem in room monitoring where you have constant high CO2- you'd have to take the sensor outside to fix it's reference level.

petsfed 7y ago

The core device is typically on the order of $50-$150 US, but with many of the sensors that CO2meter sells, you're also getting a microcontroller, display, power supply, etc. You'll frequently find temperature and humidity sensors and also barometric pressure sensors rolled into that, since NDIR is affected by all those things. So the price of a good, fully realized NDIR CO2 meter is comparable with any low-volume, moderate precision, moderate complexity electronic device.

Klinky 7y ago

Andreas Spiess has a good video on VOC vs CO2 sensors. https://www.youtube.com/watch?v=FL0L-nic9Vw https://www.youtube.com/watch?v=FL0L-nic9Vw

Rebelgecko 7y ago
His channel is a goldmine for anyone who plays around with ESP-32 microcontrollers or similar devices

Hasz 7y ago

For $20, you can get the MH Z-19, which is a NDIR type. You can talk to it over UART, and it comes in a 5000ppm and 2000ppm model IIRC. Decent documentation, and a good little sensor. The S8-0053 looks interesting, but I have no experience with it. Also NDIR, boasts +- 40ppm accuraxy -- the room air might not even be that homogeneous... The cheap ones are electrochemical, and they're not even that cheap. https://sandboxelectronics.com/files/SEN-000007/MG811.pdf https://sandboxelectronics.com/files/SEN-000007/MG811.pdf

polskibus 7y ago
Problem with it is that it autorecalibrates itself every 24hrs as far as I remember. It is a problem in room monitoring where you have constant high CO2- you'd have to take the sensor outside to fix it's reference level.