# Color Switcher

A Raspberry Pi Pico project that sends commands over UART to a connected computer. Written entirely in C using the Pico SDK.

## Prerequisites

- [Docker](https://docs.docker.com/get-docker/) and Docker Compose

No local toolchain installation needed — everything runs inside the container.

## Building

```bash
# Build the Docker image (first time only, or after Dockerfile changes)
docker compose build

# Compile the firmware
docker compose up
```

The `.uf2` firmware file will appear in `build/`.

## Flashing

1. Hold the **BOOTSEL** button on the Pico and plug it into USB
2. It mounts as a USB mass storage device
3. Drag the `.uf2` file from `build/` onto the Pico
4. The Pico reboots and runs the firmware

## Interactive Shell

To drop into the build container for debugging or manual commands:

```bash
docker compose run --rm pico-build bash
```