Piezo sensor with bare touchboard

Hello everyone,

I'm after a bit of advice, i am currently building an interactive golf hole using a bare conductive touchboard and piezo sensors, the idea is for the ball to trigger the sensor and therefore trigger an mp3 loaded onto the touchboard, i cant seem to get the desired effect without touching the sensor with my hand, im guessing it needs to be a conductive material or substance that completes the circuit so i tried painting the ball with conductive aint and using foil strips under the balls path, does anybody know what im doing wrong, is it the code that needs changing on the touchboard or am i using the wrong type of sensors? HELP PLEASSE!!! Its for a uni project and im running out of time!

Its for a uni project and im running out of time!

What a shame that you didn't start earlier!