WS281X: 3 Pin Led strips - D0, GND, +5 VCC Make Sure to give common Ground between RPI and the strip, regardless you are using an external power supply or not.

This project is an experimental holographic display based on the Raspberry Pi 5 and WS2812 LED matrix panels. It renders .vox voxel models as rotational slice animations on a 16×32 matrix (two chained ...

Raspberry Pi 4とモータードライブ基板を使ってステッピングモーターをPythonで操作する一連の手順をまとめます。 モータードライバ基板 ステッピングモーターはRaspberry Piから特殊な波形（PWM：パルス幅変調 Pluse Width Modulation）を受信する事により駆動します。

While the Raspberry Pi has very good support for an I2C bus, a lot of very cool chips – including the in system programmer for just about every ATtiny and ATmega microcontroller – use an SPI bus.