Comment by callmemclovin
Comment by callmemclovin 14 hours ago
That's in the normal range of accuracy of modern CO2 sensors, for example SCD40 from Sensirion is described with an accuracy of ±50.0 ppm ±5.0 %m.v.
Comment by callmemclovin 14 hours ago
That's in the normal range of accuracy of modern CO2 sensors, for example SCD40 from Sensirion is described with an accuracy of ±50.0 ppm ±5.0 %m.v.
That’s if the voltage supply was stable and within electrical specs for a sufficient period of time. We can see this is a snippet 2 hours into the discontinous collection.
3.6V is the maximum value that the nrf52832 SoC can handle. I would suspect the VDD is variable.
Actually the real accuracy is much better, especially with optical NDIR sensors.
We do a lot of testing against reference grade sensors and typically see very good performance and reproducibility [1].
[1] https://www.airgradient.com/blog/performance-of-low-cost-co2...