Does the Bosch BME280 (SEN-15440) store calibration numbers in NVRAM that will persist after a power cycle.
As far as I know, the Bosch BME280 sensor (as in the SEN-15440 module) stores calibration data in non-volatile memory (NVRAM) that persists after a power cycle.
Yes the datasheet does mention some NVRAM in the module.
But is it possible for the end user to provide their own calibration offset for temperature and altitude correction.
It looks like I may have to do this in the code which reads the sensor and then provide a correction off set for temp and pressure / altitude.
I hope @TS-Russell will be kind enough to clarify.
I’m not certain…the factory offsets are set in NVM. The calibration offsets are set in code, which is housed in the MCU memory/code that is uploaded…but it is not in the NVM on the sensor itself (that just has the factory stuff from bosch…anything you set in code is going to the MCU memory)
" Trimming Parameters
- The trimming parameters are programmed into the devices’ non-volatile memory (NVM) during production and cannot be altered by users. These are used for the calibration/compensation parameters." Qwiic Atmospheric Sensor (BME280) Hookup Guide - SparkFun Learn
@TS-Russell ; thank you for the follow up.
I will do my calibrations in the code which gets the raw data from the sensor.