Home Security System

Topics: Passive infrared sensor, Security, Infrared Pages: 20 (5199 words) Published: March 31, 2013




Nowadays, house security system becomes the best solution to overcome house intrusion problem when user is not in house. As we know, there are many types of house security system which is too expensive and difficult to use. For that reason, an effective house security system at low cost is built where user can also program the security system by their own. This project is focusing on developing a house security system with an active infrared motion detector which is controlled by microcontroller Intel 8051. The overall project is divided into two parts. The first part is concern on the hardware development where all electronics component are connected via the circuit design using wrapping technique. An active infrared, the magnetic sensor, and keypad are the input components while buzzer, indicator, and LCD display are the output components where it’s all controlled by controller circuit. The second part is base on software programming to operate the hardware structure. Program for security system based on microcontroller Intel 8051 assembly language is assemble using ASM51 assembler to get the binary file thus, to load into external memory of the hardware structure via serial communication. The process of downloading and executing the program is done using HyperTerminal’s communication software to the microcontroller serial port. In order to achieve the best house security system, more detectors or sensors can be connected to the microcontroller output port where it can be reprogram by user using their personal computer at home. As the result, the infrared motion detector is capable to detect motion while the microcontroller is capable to control the whole operation of the security system.





Motion detection is the action of sensing physical movement in a given area. Motion can be detected by measuring change in speed or vector of an object in the field of view. This can be achieved either by mechanical devices that physically interact with the field or by electronic devices that quantifies and measures changes in the given environment.

There are two device of motion detection which is the mechanical device, and the other one is electronic device. In the mechanical device, a tripwire is a simple form of motion detection. If a moving objects steps into the tripwire's field of view then a simple sound device like bells may alert the user. Mechanical motion detection devices can be simple to implement, but at the same time, it can be defeated easily by interrupting the devices' mechanics like "cutting the wire”.

While in electronic device, the electronic motion sensing such as motion detectors, can prevent such mechanical intervention. The principal methods by which motion can be electronically identified are optical detection and acoustical detection. Infrared light or laser technology may be used for optical detection.

Motion detection devices, such as motion detectors, have sensors that detect movement and send a signal to a sound device that produces an alarm or switch on an image recording device. There are motions detector which employ cameras connected to a computer which stores and manages captured images to be viewed over a computer network.

The applications for such detection are detection of unauthorized entry, detection of cessation of occupancy of an area to extinguish lighting, and detection of a moving object which triggers a camera to record subsequent events. The motion detector is thus a basic idea of electronic security systems.


Project objective

The objective of this project is to build a house security system using microcontroller Intel 8051 based on active infrared motion detection.


Project scope

This project concentrates on a development of an active infrared motion...
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