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38% OFF Capteur infrarouge de CO2 MH-Z19B version améliorée de 0-5000PPM pour surveiller la qualité de l'air intérieur avec UART/PWM 25,18€ 40,59€ View It

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PippijnVS 31/12/2020

Works very well, but the one I got has an internal thermometer that's off by around 6 Kelvin. This makes all measurements wrong, and I had to implement a 3-point (at least) calibration using a linear function of temperature and measured CO2 ppm. The good news is, the error is linear in those 2 variables, so 3 accurately measured calibration points with a reference sensor will do the job. Another good news is that the sensor actually reports its measured temperature along with the ppm number via UART. I will be buying more of these, as they are extremely accurate and quick. If they are also off by a linear function, I just need to calibrate them individually. On the topic of calibration: I recommend doing a zero point calibration early on (outside). I recommend against using the span point calibration. It didn't do my sensor any good. I've also turned off automatic baseline calibration.

Commentaires (1)

Soumettre

BG444985094 Ihad the same problem. I ordered more then 30 pieces. The temperature value was off 20 K in some sensors. I had to calibrate it by myself with a reference sensor like you mentioned.
Répondre 11/01/2021

Soumettre

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