I want a circuit to close when I OPEN a glass jar ...
I know how to program it in flash, but my current project is all hardware based, and I don't want to use a computer to solve it.
I've tried using a photo cell, but for some reason it won't trigger on the circuit I'm circuitbending. I've used a photocell on another bend, and it worked there, but on this project I'm circuitbending one of those greeting cards where you can record your own voice, and it seems that it needs a good solid connection before it will trigger.
Would greatly appreciate all tips.
Addition: I need a solution that takes as little space as possible.