Hi,
I am working with BME280 sensors for over a year now. I currently have 10 BME280 sensors, all from Adafruit.
8 sensors are showing humidity -8% and 2 sensors are showing +12% humidity. I am checking them against the UT333 sensor and handheld psychrometer.
I have tried to recalibrate the sensors, by dry baking them in reflow oven at 120c for 2 hours and rehydrating them for 24 hours at 80%+ humidity.
After recalibration attempt, 2 sensors that were showing +12% humidity are now showing correct readings. but the remaining 8 sensors which were showing -8% are still showing -8% humidity.
How can I fix this?