What is a good pressure plate for RPi3?

Question

Hi, my assistant and I are hoping to create a doormat that triggers events (think halloween). Can someone give us advice on the best way to do that? We were thinking of putting some kind of pressure sensor underneath, but the only ones we've found are really tiny. We welcome all suggestions (trigger beam, etc). Thanks!

DAB · Accepted Answer

Why not use a large capacitor sheet connected to a PSOC and use the capacitive sense capability to indicate when someone steps on the sheet?

It is simple, inexpensive and makes a good home project for the kids.

DAB

dougw · Answer

I'm not sure how long it would last, but 2 sheets of aluminum foil separated by something a bit spongy (like a rug or a towel) should work for a while. It may be more robust if you use some metal mesh (window screen) or chicken wire instead of foil, but you will need to test to ensure continuity across the surface first. Some furnace filters have expanded metal mesh grills.

You could also use a vibration sensor:

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