ANALOG LightUp CoinPurse
02/26/2010, 3:03 PM
Filed under: Uncategorized | Tags: ,

This small coin purse lights up when it is open, and lights out when it is closed.

The main idea behind this project is to use the snap (or any purse closing mechanism) as a switch, opening and closing a circuit that in turn acts on the LEDs.
The problem I came across is that I wanted the LEDs to be OFF when the switch is on (snaps snapped together, and circuit is closed) and the LEDs to be on when the switch is off (snaps apart, and circuit is open).

Some first ideas to do this was to create a short-circuit (bad idea!) and use the button as a circuit breaker.

This is what actually ended up in the coin purse.  (Thanks Prof. Horowitz!)

Yay it works! 😀  (a possibility for playing with LED light levels too!)

Problems: there are some… coming soon


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