First read after reset always 28.82 °C 81732.34 Pa about bme280

[coelner]

IMHO I think it is a bug and you can solve it by make two measurements.
(and you get Pa not hPa)

@finitespace

• In BME280I2C.h you use filter_16, in all other settings Filter_Off
• do we now how long a measurement takes? I can't find a value in the datasheet
• Maybe a problem with data register shadowing?
• add in the oversampling enum a zero value for disabling this feature.
• check for register 0xF3 "status" for measuring and wait

[finitespace]

Yes, @coelner is correct, I recently changed the Filter to 16 to provide more stable measurements (I think there is a typo in his post: I think he meant change the filter not the oversampling).

The filter works by aggregating the last X samples together. So a larger filter requires more time to fill the buffer, when you reset, I would guess these values are set to their default, so it would make sense for the first read to give bogus data. I can go look at the datasheet later to see if they have any insight on this.

You can do one of two things:

1. Ignore the first read until the buffer has been populated.
2. Set the filter to off. This will provide the instantaneous value instead of the more reliable aggregated value.

[coelner]

@finitespace the part behind your name was only my thought while searching for the issue. Not directly related to this issue.

[finitespace]

Alright, I have added a routine to initialize the filter buffer. Could you pull down the filtering branch and check if it fixes the problem?

[finitespace]

I have created a pull request for this issue, I will leave it open for a little to allow review before I merge the changes. #81