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Zig Embedded — Raspberry Pi Pico 2 W

A collection of embedded projects for the Raspberry Pi Pico 2 W (RP2350) written in Zig, using the MicroZig framework.

Projects

# Project Concepts
1 Blinky GPIO output, timing
2.1 Button LED GPIO input, pull-down resistor
2.2 Mini Table Lamp Debouncing, toggle state
3 Flowing Light Multiple GPIOs, animation loop
4.1 Breathing LED PWM (in progress)

1. Blinky

Blinks an LED connected to GPIO15 every 250ms. The classic "Hello, World!" of embedded systems.

GPIO15 → LED → GND

2.1. Button LED

Holds an LED on while a button is held down. Uses a pull-down resistor so the pin reads 0 when the button is unpressed.

GPIO13 → Button → 3.3V   (pull-down)
GPIO15 → LED → GND

2.2. Mini Table Lamp

Each button press toggles the LED on or off. Includes a 25ms debounce delay to filter out contact noise, and blocks until the button is released before accepting the next press.

GPIO13 → Button → 3.3V   (pull-down)
GPIO15 → LED → GND

3. Flowing Light

Ten LEDs animate in a back-and-forth wave pattern, each lit for 100ms before moving to the next.

GPIO16–22, GPIO26–28 → LEDs → GND   (10 LEDs total)

4.1. Breathing LED

PWM-based LED that smoothly fades in and out. (Work in progress)

GPIO15 → LED → GND

Building

Each project is a standalone Zig package. Navigate into a project directory and run:

cd 1-blinky
zig build

The compiled .uf2 firmware will be in zig-out/firmware/. To flash, hold the BOOTSEL button on the Pico while plugging in USB, then copy the .uf2 file to the mounted drive.

Requirements

  • Zig 0.15.1
  • MicroZig 0.15.1 (fetched automatically via zig build)