BME 280 wrong temp value
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BME 280 wrong temp value
Hello,
i got wrong temp values from my BME280.
the temperature difference is +2°C.
How can i get more accurate data?
i got wrong temp values from my BME280.
the temperature difference is +2°C.
How can i get more accurate data?
Re: BME 280 wrong temp value
Often the sensor is mounted too close to an external heat source, that can be compensated by adjusting the 'Temperature offset' setting, in your case it should be -20.
Alternatively, if you need the original Humidity value (it may be correct, while the temperature is off), you can add this in the 'Formula' field of the 'Temperature' value: "%value%-2" (copy without the quotes).
Alternatively, if you need the original Humidity value (it may be correct, while the temperature is off), you can add this in the 'Formula' field of the 'Temperature' value: "%value%-2" (copy without the quotes).
/Ton (PayPal.me)
Re: BME 280 wrong temp value
the sensor is in the shade in its own 3d printed housing in which only the sensor is located.
Re: BME 280 wrong temp value
When using the temperature offset in the BME280, the humidity is also compensated for this offset.
So no need to compensate the humidity as this is absolutely NOT a linear relation.
The typical 2 degree offset was also an issue on some (really old) builds of ESPEasy.
This may happen when the registers of the BME280 were not all read in 1 single I2C transmission.
What build of ESPEasy are you running?
So no need to compensate the humidity as this is absolutely NOT a linear relation.
The typical 2 degree offset was also an issue on some (really old) builds of ESPEasy.
This may happen when the registers of the BME280 were not all read in 1 single I2C transmission.
What build of ESPEasy are you running?
Re: BME 280 wrong temp value
i ue the last fw "ESP_Easy_mega_20220427_normal_ESP8266_4M1M".
i set the offset for 2°C but now after the temp is falling it is again wrong
i set the offset for 2°C but now after the temp is falling it is again wrong
Re: BME 280 wrong temp value
And that housing has enough openings so the temperature can (quickly) adjust to the surrounding ambient temperature?
/Ton (PayPal.me)
Re: BME 280 wrong temp value
Maybe also check the logs to see if you have read errors every now and then.
Re: BME 280 wrong temp value
I suggest posting a photo of your installed sensor. Photo should also show its placement from the ESP device.the sensor is in the shade in its own 3d printed housing in which only the sensor is located.
- Thomas
Re: BME 280 wrong temp value
And note the cable length!
Issues I've seen with the BME280:
- Reporting 2 degree too high (and thus humidity too low), on (really) old builds of ESPEasy
- Sensor heating itself, but that's less likely in a separate enclosure.
- Loose contacts or moisture shorting some pads => Check logs to see if there are faulty readings
- Too long I2C cabling, or missing pull-up resistors => lower I2C clock speed and check logs
Issues I've seen with the BME280:
- Reporting 2 degree too high (and thus humidity too low), on (really) old builds of ESPEasy
- Sensor heating itself, but that's less likely in a separate enclosure.
- Loose contacts or moisture shorting some pads => Check logs to see if there are faulty readings
- Too long I2C cabling, or missing pull-up resistors => lower I2C clock speed and check logs
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