AVR TransistorTester

After some sought and consultation with author of original project I decided to use same regulator for both MCU supplies, but will use inductor to filter noise for AVCC. I will use separate regulator for LCD.

ATMEGA328P has two supply pins: VCC and AVCC. AVCC pin is supply of ADC converter and generally should be clean supply. So I think to use two 5V regulators. One for VCC and one for AVCC. But this is not enough. Measurements done by switching resistors using digital I/O pins. So actually VCC supply will be part of measurement anyway. May be it will be necessary to add buffer or mux that uses AVCC as supply to solve this problem.

Rotary Encoder with switch from Banggood checked. Works fine.