Hi everyone,
I currently have 2 rak1906 sensors purchased from Rak store. After purchasing and uploading the arduino code, I discovered that the gas value of the 2 sensors is different, one sensor’s gas value fluctuates from 1kohms to 20kohms, and the other sensor will fluctuate from 80kohms to 300kohms. So is the reason here because the sensor is broken? and which sensor is working properly?
Welcome back to the forum @ptitnqh
The Bosch data sheet does not give any hint about the range of the resistance.
Bosch-bme680-ds001.pdf (1.4 MB)
I run a quick test with 3 RAK1906:
And get confusing results as well for the “resistance”:
Two sensors are in the lower range, one is in the upper range.
However, using an algorithm to calculate the IAQ, all three sensors show a similar level:
There are at least two algorithms for IAQ calculation for the BME680:
- BME680 IAQ algorithm which is my preferred one, as I can see results immediately.
- Bosch-BSEC2-Library which I used once only. I don’t like it, because it is
a) closed source
b) it takes up to 3 hours before a first result is available