Could please also confirm that you have followed all the recommendations of BME280's HSMI manual, and especially that you protected the hole in the sensor's lid from any contamination during the process (e.g. solder flux, cleaning agents, sprays, etc.)? Are you using our recommended BME280's sensor API? Could you please share more details about the sensor used as reference/ground truth? Since relative humidity depends on temperature, it would be useful to also share both temperatures of BME280 and reference device.
... View more