First day using the Arduino Duemilanove.
I was playing around with the Knock and Graph examples, I had a piezo transducer connected with a resistor, and was looking looking at the waveform of me hitting the transducer in Processing.
All of a sudden the arduino started sending a value of around 400 constantly from the analogue input, and no amount of restarting/pulling the plug will change this.
If I connect the analogue input to ground I get a zero readout, and if I connect to +5v or +3v I get appropriate readings, but with the transducer connected I get 400, with a little disturbance if I hit the transducer.
Have I somehow damaged the input, or is there something else I can try to fix the problem?
The five other inputs appear to be working fine.