// Arduino based metal detector// (C)Dzl july 2013//
http://dzlsevilgeniuslair.blogspot.dk/// Connect search coil
oscillator (20-200kHz) to pin 5// Connect piezo between pin 13 and
GND// Connect NULL button between pin 12 anf GND// REMEMBER TO
PRESS NULL BUTTON AFTER POWER UP!!#define SET(x,y) (x |=(1
