Is there a way to calibrate or adjust pressure. Compare two units. #4 is too sensitive.
Welcome to the forum!
If you happen to have an iPhone 6s or better they have a built in barometer that I have found to be very accurate.
Thank you for your quick response and suggestion.
I need VOCs and Air Quality as well so I am currently limited to the BME 680.
Right. But you could use the phone as a comparison for calibration of the 680.
That is my question – How do I calibrate the BME 680?
Do I need to set up my own zero and span downstream of the 680 output or is there something internal to the BME 680 that I can adjust?
From my experience, the output of the 680 is very accurate. The BME680 can accept calibration values so the raw output is correct. But I think it would be easier just to try a local cal and input an offset in your code. We call that a “cal factor”. The pressure output of the 680 is linear so an offset may work.
And BTW, what are the units on your graph? :)
Thank you for your information.
cb: the pressure output … is linear so an offset may work.
gg: I believe the BME 680 pressure is not working properly.
The range is too large for only an offset to solve this.
The Y units are pascals
The X units are minutes – the graph covers 24 hours.
I think the solution is replace the chip.
Yeah, if the sensors are side by side and there is that much variance in #4 then it may be flakey.
Thank you for your concurrence