1- what you will need If you feel geeky enough to build SPIN yourself, you might find this tutorial as a good reference. If you've never soldered before this one might encourage you to try.

This is probably most important and most frustrating thing you'll have to do with your SPIN - once you put it on our wheel it stops to be a problem, and starts to be fun.

Long, long time ago, when I began to loose my mind and money for RC helis, I came across Lithium-polymer batteries for the first time. My LiPo charger was... let's say "not perfect", so I decided to make something that will suit my needs and satisfy my will of creation - my own LiPo charger with integrated balancer.

LEDs were my fetish since I've managed to light first of them up, using 51 uc. This project is the result of this fascination.

Single SPIN unit is built of two boards:

• each of the two boards has 32 LEDs on each side
• both boards are equipped with single AA battery socket

SPIN can hold up to 16 images (32x256 radial pixels) which can be edited by user. It displays images only if bike is moving fast enough to let ti display persistent images (so it does not consume energy thoughtlessly).