Remote-Activated Car Horn

Overview

A portable, remotely activated car horn built with a Raspberry Pi, relay board, and off-the-shelf components.

Technical details

The Raspberry Pi runs a Discord bot. When an authorized user sends a command in a dedicated channel, the Pi signals a relay board, connecting power from a laptop charger to the horn. Each authorized user can activate it once per month to prevent repeated use.

Why I made this

A friend often slept through his alarms, which sometimes disrupted our plans. I built this device to help wake him when we had something scheduled.

What I learned

• Basic soldering
• Finding and reading component specifications
• Setting up and programming a Raspberry Pi

Documentation

I built this project more than two years ago. I don’t currently have access to the computer containing the source code or the device itself. I plan to add photos and code when I can retrieve them.