Pennies and contact cement makes for good sensors.
Don't remove the foil either, because the contact cement sticks better with those.
The tx1000 sensors react every time with the weight and conductivity of just 4 pennies. 1 penny under about 4 ounces of pressure will get a response about 80% of the time, so 4 pennies under 10-100 pounds of pressure will get you a response every time unless there's a wiring issue.
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I used to be active here lol