摘要：

The purpose of the Home Alarm System Using Metal Detector project is todemonstrate the use of a metal detector to detect any metal devices used by an intruderright before he has a chance to open the door or window. This will solve the problemwith conventional sensors or detectors where the alarm only activates once theintruder has broken an entrance. To realize this project, extensive research and studieshave been done on metal detector technology, PIC rnicrocontroller and itsprogramming language and also alarm circuit. A Beat-Frequency Oscillator (BFO)type metal detector has been chosen for this project because by far, the circuitproduces the characteristics and metal detection range that is required. To assure thatthe metal detector circuit functions accurately, certain calibration and tuning has alsobeen done on the circuit. Meanwhile the usage of Microchip PIC 16F628microcontroller assure that the alarm system have the capabilities to operateefficiently. The capabilities of the home alarm system is not only limited in detectingan intrusion attempt but also capable to perform certain features like set/resetting thealarm for a certain period of time, display the alarm status via LED, The alarm systemalerting apparatus consist of siren, strobe light and buzzer. This thesis report providesan introductory background on the Metal Detector technology and an introduction onthe thesis objective and the products available in the market. It further elaborates thedesign and implementation of the product. It reports the result of the productevaluation and makes recommendation for improvement. Finally, it concludes thethesis.

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