[Solved] Measure higher voltages with a voltage divider

Projects General Guidance
3

Voltage readout depends on two things.

  1. the output of the voltage divider
  2. Aref of the A/D

No point in using multi-turn pots or 0.1% resistors if you're going to use an A/D with a potentially unstable Aref
(Arduino's default).

Resistor/Aref inaccuracy can be fixed in code.
Resistor.Aref instability, e.g. with temp, is much harder for 'fix'.

So what resolution do you expect for that 36volt supply.
A 0.1volt resolution with two fixed 1% metalfilm resistors and the internal 1.1volt Aref should be possible.
Leo..