Closed Afteraffekt closed 4 years ago
Using a combination of 3x resistors with an LM317, voltage adjustment can be made by switching a pin on the MCU from INPUT (high impedance) to OUTPUT-LOW, on the R2 side of the voltage divider used to set the regulator's output.
Will do research on parts cost
LM317 should only take an extra pin. Check to see if it can be fit into the existing footprint.