Most pocket gadget projects around here start with a stock dev board wired to a pile of breakouts. This one goes the other way: the maker designed a single custom PCB that packs a screen, a jog dial and RGB lighting into one square handheld unit, framed as an alternative to just buying a smartwatch.
The layout is tidy. A central monochrome OLED sits in the middle of the board, with a rotary jog dial on the upper right and a USB-C port on the lower right edge. Double-row pin header sockets run along the top and bottom, and a surface-mount microcontroller module hides under an RF shield. There are status LEDs, a gyro and a buzzer on board. My favourite detail is that the addressable RGB LEDs live on the reverse side and light up the board's edges instead of the face.
Power comes from a white USB-C cable, a boot string reading MSPW0G3519 appears, and then a graphical user interface loads. Menus are worked through by rotating and clicking the dial, with top-level entries for Settings, Games, Theme, UART, RGB, Gyro and More. The RGB menu offers sliders for Light Mode, Fade Speed, LED Bright and RGB Switch, and they drive the edge LEDs through dynamic multi-color patterns. The Gyro app shows live X, Y and Z readouts next to a rotating 3D wireframe cube that shifts as the board tilts. There is also a game launcher with Dino Run, Flappy Bird and Snake, plus animated pixel-art facial expressions.
One thing still hanging: the exact part name of the flat rotary encoder has not been shared, and whether the menu system is open source remains unanswered.