Railroad Grade Crossing Signal Controller

This project guide explains how to build an operating railroad grade crossing signal controller (GCSC) for controlling a simulated railroad crossing signal that has working flashing lamps and striking bell. Just like the real thing! This board was also designed with hacking in mind. Due to the on-board 5 VDC... Read more »

Beating Heart Headband

Build a pulse-sensing headband that flashes an LED array in time to the beating of your heart. You’ll scratch-build your own perfboard Arduino, assemble the Open Heart LED display, and learn how to use the AMPED pulse sensor. It’s the next best thing to wearing your heart on your sleeve. Read more »