feat: add IIR filter configuration via BME280_IIR_FILTER env var#14
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Write config register 0xF5 (bits [4:2]) before each measurement. Defaults to 0 (filter off) to preserve existing behavior. Recommended value for indoor use is 2 (4x coefficient). Document the new variable in .env.example and README. Co-authored-by: agilicode <agilicode@gmail.com>
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Summary
0xF5(bits [4:2]) with the IIR filter coefficient before each measurementBME280_IIR_FILTER:0=off (default),1=2×,2=4×,3=8×,4=16×0(filter off) to preserve existing behavior.env.exampleand README configuration tablePer Bosch BME280 datasheet table 28: IIR filter suppresses short-term disturbances (door slams, wind gusts). Recommended coefficient 4 or 8 for indoor navigation use cases.
Test plan
docker compose run --rm testBME280_IIR_FILTER=2 python sensor_api.pyapplies 4× filter on Pi