pyr0ball
commented
5 years ago Switching over to the internal VRef will require hardware changes:
- ADC inputs need to be stepped down to 1.1v max, necessitating the addition of a voltage divider for each ADC input
- ARef pin needs to be decoupled with an additional capacitor (100pF - 0.1uF)
Currently the firmware logic doesn't directly account for the VCC input voltage of the circuit, but instead polls only the amp circuit for adjustment data. This has shown to cause instability with the voltage adjustment output.
Switching on the internal vRef and getting VCC polling will allow the ADC logic to be more precise and anticipatory of voltage fluctuations, without getting the big swings that occur from referential polling.