Testing the FSR and spring

Here is a quick single key for testing.I will try various spring strength and positions for the FSR(force sensitive resistor) to see which gives the widest response.

I will also use this one to test the optical sensors used for keypress and velocity measurement.

So far it is giving about a 2 to 1 response with a fairly weak spring from a bike brake lever.
the wider the response the better, it is more likely i can use the FSR directly with the arduino rather than having to use external circuitry.

It should be ok with 1.25 volts range which would give me 8 bits of resolution out of the 10 bits on the arduino input.

I have completely changed the design of the key since i made that one and the rendering. both parts rotate around the same pivot point. it makes it easier to allign the optical sensors, and makes it more low profile.( it has to fit inside a guitar body.)