Super Bright Bike Helmet Lights

Bike Helmet 1

Introduction

As I was riding into work during the winter, I wanted to try and reduce my risk of being hit by a car. I decided to make myself very noticeable and different to the drivers, which will hopefully mean they will drive with more care around me.

Features

Attached to the helmet are 4 3W LEDs, 2 green and 2 blue. At the back there is a connecter which connects to the battery pack and electronics, this pack goes into my bag.

  • 2 x 3W blue LED
  • 2 x 3W green LED
  • 11.1v 2200mAh Li-Po battery
  • Microcontroller for customisable flash sequence
  • 2 x DC-DC constant current power supplies for effciency.
  • Quick releasing connector to helmet

Design

Bike Light Circuit
Bike Light Circuit

Bike Light Circuit & Battery
Bike Light Circuit & Battery

Bike Helmet 1
Bike Helmet 1

Bike Helmet 2
Bike Helmet 2

Bike Light
Bike Light

Bike Light 1
Bike Light 1

I used 2 constant current drivers I got ebay to drive theĀ  LEDs, I can drive the blue and green ones separatly.

An AVR is used to controll them, this is probably a bit over kill but it’s what I have lying about!

The battery and electroncis goes into my bag and connects to the helmet via the 4 pin connector. This was design so if there was an accident it would pull easily away from the helmet, and not pull it off my head.

See this video to see it working:

Bike Light Movie