I'm looking for barometer sensors for use in Arduino projects. One of the items I consider is the HP206C (at Reichelt, Germany). The vendor contradicts himself a little bit when he mentions 0.1 m and 0.01 m accuracy. Therefore I'm trying to look it up in the data sheet.
The original data sheet provided by Reichelt says:
Pressure Relative Accuracy +/- 0.6 mbar
Pressure Resolution of Output Data 0,01 mbar
Altimeter Resolution of Output Data 0,01 m
So, the datasheet contradicts itself, IMHO.
There's a newer data sheet by the Producer available as well. It says:
Pressure Relative Accuracy +/- 0.5 mbar
Pressure/Altitude Resolution in Pressure mode 0.01 mbar
Pressure/Altitude Resolution in Altimeter mode 0.1 m
That's ok so far.
The product is advertised with 0.1 m. Is that a realistic number? IMHO the output resolution is irrelevant, only the accuracy matters.
If my bank account has $1000.00, I can increase the output resolution to $1000.00000 but the values do not get better, right? The accuracy is still 1 cent, even if the output resolution is 1 millicent.
Is my understanding correct?
From the comments of @PlasmaHH, it seems I need to explain the application:
- I need relative pressure measurement only, not absolute values. That's why I ignore other values in the data sheet.
- I cannot wait "a few seconds" and take an average of the measured values. Reason is: I need to measure the height of a short flight, which lasts less than 2 seconds.