# Calibration of SDS011 and BME280
**URL:** https://forum.sensor.community/t/calibration-of-sds011-and-bme280/312
**Category:** Uncategorized
**Created:** [February 14, 2021, 7:25pm UTC](https://forum.sensor.community/t/calibration-of-sds011-and-bme280/312 "2021-02-14T19:25:42Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@Schone](https://forum.sensor.community/u/Schone)
#### Post date: [February 14, 2021, 7:25pm UTC](https://forum.sensor.community/t/calibration-of-sds011-and-bme280/312/1 "2021-02-14T19:25:42Z")
Hello everybody,
Do I need to calibrate the SDS011 and BME280? I believe the temperature is 1 degree Celcius too low and the humidity 5% too high. I have the sensors still inside the house.
Thank you. 🥰
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### Author:  [@pjg](https://forum.sensor.community/u/pjg)
#### Post date: [February 14, 2021, 9:06pm UTC](https://forum.sensor.community/t/calibration-of-sds011-and-bme280/312/2 "2021-02-14T21:06:51Z")
If it is just this, don’t worry. I don’t think the BME280 can really do better (look at the datasheet).
The calibration of a dust sensor is unfortunately not trivial. You have to spray some aerosols with a known diameter/weight in a laboratory… We tried to build an algorithm do calibrate a few years ago, but no success.
FYI: [Report of field tests PM-sensors available online! — VAQUUMS project website](https://vaquums.eu/news/pm-report-field-tests-available-online)
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### Author:  [@Schone](https://forum.sensor.community/u/Schone)
#### Post date: [February 15, 2021, 8:15am UTC](https://forum.sensor.community/t/calibration-of-sds011-and-bme280/312/3 "2021-02-15T08:15:51Z")
Hello Pjg,
Thank you. Do you know what the software (on the esp or on the internet…) does with temperature and humidity values, I mean does it effect the dust values?
Greetings from Belgium.
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### Author:  [@nephilim](https://forum.sensor.community/u/nephilim)
#### Post date: [February 15, 2021, 6:28pm UTC](https://forum.sensor.community/t/calibration-of-sds011-and-bme280/312/4 "2021-02-15T18:28:10Z")
As far as I know the SDS011’s and BME280’s outputs are treated independently.
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### Author:  [@pjg](https://forum.sensor.community/u/pjg)
#### Post date: [February 16, 2021, 7:05am UTC](https://forum.sensor.community/t/calibration-of-sds011-and-bme280/312/5 "2021-02-16T07:05:15Z")
We just collect raw values. The firmware fetchs the measurements of both the sensors (UART or I2C protocol) and produce a json file. All the json are “collected” by the API and displayed on the map.