Design and implementation of metal detector using DTMF technology

The outline and usage of a mobile phone worked metal detector is introduced in this paper. Presently days, metal recognizing framework are turning out to be imperative part in securing live and properties of regular citizen and military. This metal detector is connected on mobile phone worked vehicle. For this paper, the metal identifier worked in a way that the metal sensor (Colpitts oscillator) detects any electrically or metallic object conveyed near it. The metal indicator circuit creates a sound which can hear to the end client through the cell Phone. The vehicle comprises of arduino board, a L293D interface circuit, and an motor driving framework. The controlling electronics are associated with the arduino board. The arduino board sends signs to the interfacing board L293D that controls the motor driving framework. In the course of a call, if any button is pressed, a tone corresponding to the button pressed is heard at the other end of the call. This tone is called `dual-tone multiple-frequency' (DTMF) tone. The vehicle perceives this DTMF tone with the help of the phone stacked in the vehicle.