yclo
Flashaholic*
Parts:
-Clear plastic (very tough) screw top water proof container, obtained in an airport souvenir shop in Japan
-4 AA battery holder
-7 leds
-Magnetic switch
-Bike light
Operation:
Use little piece of magnet to activate the magnetic switch. This causes the bike light circuitry to change state each time you hold the magnet near it, no need to keep the magnet there.
Cycles through 3 modes, blink1-blink2-constant on. Constant on seems to be PWM as it can be seen flashing when waved around.
Bike light (those red ones you put on the back of a bike) cost a whopping $1. Seems like a good price for a switch. If you're lucky you might get more modes.
YC