Started conversion to Arduino Micro
First go on moving to Micro.

Working but full of bugs
Adding ADC lib
Addnig math lib
Calibration function more sleek
Button read updated

Now the program does not stall when button is pressed
Display color changes if reading is stable
Libs
Save to SD

Not working. Sketch is too big
Writing cal to EEPROM

Reading calibration from EEPROM on startup, writing at calibration