Extreme Sport Turn Signal Helmet

This is a multi-functional turn signal built into a helmet, making it suitable for skateboards, bicycles, scooters, roller skates, and just about any activity that involves helmets and rapid changes in direction. It is controllable via the small capacitive touch buttons on either side. Pressing either button will start the flashing on that side only, or stop all flashing if that side was already flashing. This makes control of the device intuitive. All dangerous components are moved to the outside of the helmet, both because helmets are meant to be disposed of after impact, and because a battery explosion would be much worse contained within the helmet.

The build started as a normal helmet, a Circuit Playground Express, two chains of Yellow LEDs wired in parallel, a battery, 2 paper fasteners, and 2 leads with alligator clips. The LEDs were attached to the helmet on their respective halves and wired to ground, and their control pins (A3 and A4). The paper fasteners were mounted above the ears and attached via alligator clips to A1 and A2. The code was uploaded to the Circuit Playground Express, the battery was attached, and the board and battery were then mounted on the back of the helmet.