# LLM Index — ELK Labs

All posts and guides are available as raw markdown at their `.md` URL.
Append `.md` to any URL, e.g. `/posts/mini-crt-arcade.md` or `/guides/raspberry-pi.md`.

## Guides

- [Raspberry Pi quickstart](/guides/raspberry-pi.md) — Flash an SD card, find the Pi on your network, SSH in, set up keys, pick an editor. Fifteen minutes if nothing is weird.
- [Arduino quickstart](/guides/arduino.md) — Install arduino-cli, install the AVR core, plug in a Nano, flash a sketch. Twenty minutes if the USB driver cooperates.

## Posts

- [Nano Theremin — A 15-Minute Build with My Son](/posts/nano-theremin.md) — A hand-waving theremin on an Arduino Nano: ultrasonic sensor, passive buzzer, three jumper wires, and just enough explanation to teach my son what each part does.
- [Mini CRT Arcade Box](/posts/mini-crt-arcade.md) — A desk-sitting retro arcade in a 3D-printed CRT-shaped enclosure — RetroPie on a Pi Zero W with a 3.5" HDMI display, stereo speakers, and a front-panel volume knob.
- [Motion Alarm — First Arduino Build](/posts/motion-alarm.md) — A PIR motion sensor, buzzer, and LED wired to an Inland Nano in under an hour. A beginner-friendly first microcontroller build — and the start of a bedroom booby trap.