blog for Arduino metal detector?

http://forum.arduino.cc//index.php?PHPSESSID=m84kdmhr0mcd8isuht3n0k9s73&topic=65712.30

very simple phase detector using arduino

Built this circuit designed by DC42 , but my coils where off and didnt get much of the effect next time maybe boost the current to the coils , I changed the code a little so ill post this here to keep safe for when I return to It , i also tried a different timming circuit

https://github.com/dc42/arduino/tree/master/MetalDetector

// Induction balance metal detector

code working in protoype v1

// Spectrometer_led10
// clear the LCD
void clearLCD() {
Serial.print("");
delay(1);

Colorimeter design arduino