The RaspberryPi Sense
hat:http://uk.rs-online.com/web/p/products/8949310/?grossPrice=Y&cm_mmc=UK-PLA-_-google-_-PLA_UK_EN_Semiconductors-_-Semiconductor_Development_Kits&mkwid=sfiwex7tU_dc|pcrid|88057061283|pkw||pmt||prd|8949310&gclid=CO-Xs9LIgc4CFRK3GwodeXwIcA
is an add-on for the Pi that has an 8*8 array of multicoloured leds and
other bits. I've seen capacitative sensors around the size of the LED's
and I thought of combining the two to make a sensor very similar to how
I guess the LinnStrument works! It wont be done in a rush mind!
Tom