  This research focuses on detection of unauthorized access to residential and
commercial buildings when the residents are far away from the access gate of
the house. The system is a simple and reliable touch activated security system
and uses sensor technology to revolutionize the standards of living. The system
provides a best solution to most of the problems faced by house owners in their
daily life. Due to its simple electronic components nature, it is more
adaptable and cost-effective. The system is divided into three units; the power
supply unit which employs the use of both DC battery and mains supply to ensure
constant power supply to the circuit, the trigger unit which is responsible for
activating the alarm unit and designed to have much time and period and
moderate sensitivity in order to reduce the rate of false alarm, and the alarm
amplitude unit which main function is to produce amplitude alarm sound when
triggered by the trigger unit with the aim of producing a large audible sound
that can alert the entire neighborhood or scare an intruder away. The design of
the system was achieved by considering some factors such as economy,
availability of components and research materials, efficiency, compatibility
and portability and also durability in the design process. The performance of
the system after test met design specifications. This system works on the
principle of touch sensor. The general operation of the system and performance
is dependent on the presence of an intruder entering through the door and
touching any part of the door. The overall system was constructed and tested
and it work perfectly.
