Pressure/Force Sensitive Resister and a door sensor, Works!

Mine is quite compact and I expect to use a Class 3 Lever to limit the force/pressure. That’s where the sensor is between the fulcrum and the force. Imagine a “stick” where one end is secure and the other floats. The force sensor goes close to the fixed end. When force is applied to the floating end, the max pressure on the sensor is limited by the height of the fixed end.

An example of this is the old time microswitch.


For the lever on the outside, there’s a limit on the force against the nub that works the switch.