03-31-2017, 07:27 PM
boards have arrived several days ago, yet, as was busy testing the battery-operated board and have not yet sent them to assembly. Anyway, today i finally got some interesting breakthrough.,.. in the last month i kept wondering why, when comparing to the CO2 sensor, the VOC sensor seems to saturate at about 1200 ppm, while others (Velux/Rehau Raumluft Sensor) claim it works till 1800.
I even bought a Rehau Raumluft Sensor, based on the ams sensor, yet, it still delivers too weird values, seems to miss also temperature and humidity compensation
But today i finally managed to make this graph. Green is the CO2 sensor (CM1102) and Red is the VOC sensor. until 19h, the room was open, then we closed the door. Until 19.40, where i again opened it and at 20.30 closed it.
You can see how the VOC sensor responds quite rapidly, compared to the CO2 sensor (which has similar response time to the CDM7160 and CM1106, though i need to test this). And we are not speaking about some averaging algorithms, as this happens in the course of 30+ minutes. So apparently something changes, though i do not know why so fast. The other sensors were in the boxes and this one is bare, so this may be also a reason
![[Image: d184a532-165f-11e7-8969-34ea1ac8fc20.png]](https://cloud.githubusercontent.com/assets/492455/24565874/d184a532-165f-11e7-8969-34ea1ac8fc20.png)
I even bought a Rehau Raumluft Sensor, based on the ams sensor, yet, it still delivers too weird values, seems to miss also temperature and humidity compensation
But today i finally managed to make this graph. Green is the CO2 sensor (CM1102) and Red is the VOC sensor. until 19h, the room was open, then we closed the door. Until 19.40, where i again opened it and at 20.30 closed it.
You can see how the VOC sensor responds quite rapidly, compared to the CO2 sensor (which has similar response time to the CDM7160 and CM1106, though i need to test this). And we are not speaking about some averaging algorithms, as this happens in the course of 30+ minutes. So apparently something changes, though i do not know why so fast. The other sensors were in the boxes and this one is bare, so this may be also a reason