FixPD - Portable Programmable Power Supply

Specifically built for being used on the go where there's no power outlet available, but a USB-C PD powerbank (e.g. iFixit FixHub).

Featuring USB-C PD input (preferrably 15V or 20V), 128x64 monochrome OLED display and a single rotary knob for controlling voltage and current.

It requires at least 9V input and can output up to about VIN - 5V and up to 5A.

Hardware

This pps relies on some prebuilt modules that work together.

• m5stack Module13.2 PPS
• Proffieboard V2 (pick any Arduino Nano; I had a spare Proffieboard which is likely an overkill)
• 128x64 OLED display (SSD1306)
• 5V <-> 3.3V level shifter
• 5V -> 3.3V buck converter
• Rotary encoder
• USB-C PD 20V trigger module

Firmware

Works with Arduino IDE. Install following dependencies to get started in Arduino IDE:

• U8G2
• RotaryEncoder
• OneButton

3D printed case

Printed the case. Used the knob from https://makerworld.com/de/models/628840-ec11-encoder-knob.
PETG is recommended