I wanted to make a wearable drum controller (wireless) so I knew I couldn't use piezos because moving around would false trigger them.
I took a year and a half writing an algorithm that would work with Force Sensing Resister (FSRs) by a company called Interlink. Same type of sensors used in Akai, Trigger Fingers, Ect.
You put the FSR in a voltage divider with a resister, say 10k OHM and measure the voltage on that resister.
You can make them wireless by using Xbees. To do this configure the xbee to a baud rate of 31250. To do this, you have to set it's baud rate in hexidecimal, which is a command like ATBD7A12
7A12 is 31250 in hexidecimal.
Here's the code:
This project is way cool.
I have another accelerometer algorithm that makes a kick drum sensor that's strapped to my ankle.