My unconventional switch was inspired by the mere fact that I keep forgetting to put my drinks on coasters. It was a genuine problem me and my roommate started having but I thought to myself "but if there was an indicator of the coaster being used then I would know! Enter the electronic coaster. I attached a jumper cable to the coaster that would conduct electricity through the can which would then reach the resistor and power on the LED. For as long as a metallic can was ontop of the metal coaster, the light would turn on, if it wasn't, it wouldn't. For my own safety, I removed all fluids from the actual can and dried it. I was very happy that I could create an actual electronic circuit on my own, using my own brain and it only inspires me to create more.
The Schematic
The Electronic Coaster
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