Arduino Metal Detector DIY project

Its a simple design and just for experimenting,8 parts needed to make this simple metal detector. Parts: 3 meteres solid copper wire,220ohm and 1kohm resistors,capacitor 100nf,one led,one passive buzzer and arduino board. Download schematic and code here:   • Arduino metal detector   My homemade power supply:   • Smart Homemade Power Gadget with 12V-5V-US...