Help with I2C connection to BME280 on WiPy 2.0 ...

[robert-hh]

@robert-hh I just made a small test with a set of different sensors I had in my drawer and a small temp/humidity unit for home use. I placed them all outside, so I could compare the to values I get from the local university's weather station, 3.85km distant at almost the same elevation. The weather is calm outside. Almost not wind.

DS18B20:    10.13C
DHT22:      10.30C            74.90%
SI7021:     10.01C            84.19%
BMP085:     10.80C 1004.49hPa
BME280:     10.19C 1007.28hPa 60.27%
Weath-Stn:  10.40C            79.20%
University: 10.29C 1004.26hPa 73.10%

There seems to be no single winner. Even is all devices besides DHT22 claim to do calibrated temperature measurement with 0.1C error, the variation between them is larger, although not drastic. The same for pressure. What completely seems to be poor guessing are the humidity figures. The only device in the proper range seems to be the DHT22.
I will repeat the test for temperature with a calibrated reference.

[robert-hh]

@sealyons I made a test with the calibrated temperature mesurement device:

Calibrated device: 21.7   21.8
DS18B20:           21.9   21.9
DHT22:             21.8   21.9
SI7021:            21.7   21.8
BMP085:            22.4   22.5
BME280:            21.8   21.9

Besides the BMP085, all devices were on the spot = within 1 digit variance. That status was stable for 5 hours testing. Only the BMP085 was always ~0.6 °C above, but still that at the limits of it's spec.