4 ms·
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, an
by 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 agoProblem 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.