Sensor Emissivity

[tetopik]

How to set the emissivity value?
What is the preset value then?

[RadekRojik]

The EEPROM has a limited number of write cycles. It's better to calculate it in software.
You can use the Stefan-Boltzmann law. Unfortunately, it calculates in Kelvin. This driver returns Celsius directly.
I wrote one driver as an example for schoolchildren here:
https://github.com/RadekRojik/gympl/blob/main/upython/iic/src/lib/mlx90614.py
which uses software conversion. License is MIT, you can do whatever you want with it.