A Metal Sensor is a device used to detect the presence of a metal in its proximity without touching it.
This is a pulse induction metal detector made by Future Electronics Egypt (Arduino Egypt). It uses a single search coil and a pic microcontroller.
It can detect metal objects underground, through walls and above ground as well. Typical minimum depth ranges from 25 to 30 cm underground. This range is obtained with a very rough quick-made coil (not optimized) using a 10 cm diameter object.
With an optimizaed coil range of detection increased to more than 40 cm.
The metal sensor object detection is indicated by LED. The recommended voltage supply is 12 V with a small current. However, the Metal detector was extensively tested and found to be stable operation in a range of voltage supply (9: 12 V).