I need to take a flat surface (2'x2' sheet of plywood) and be able to place an object (turd sandwich) on the surface and read if the object is either on the surface or off of it. Various sensing I've thought might work IR sensing RFID sensing Any ideas? I'd like to keep total under $20 Thanks,

Cost Effective Proximity sensing

retrolefty September 12, 2012, 11:47pm 3

turd sandwich? So maybe mount a mercury switch to your dog's tail and let him signal if the sandwich is on the surface or not?

Lefty

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