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ABSTRACT
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.


INTRODUCTION
Insecurity and crime constitute some of the major problems facing our immediate society today.
People live with fear of being attacked by burglars, vandals and thieves. Despite all the effort,
resources and time that has been devoted to the development of tools that will reduce crime
rates and make the world a safer place to live, these problems are still on the increase. These
gave rise to the need for an increasing development in the technology of alarm systems which
utilizes various principles such as infrared motion detection, light (photo) sensitive electronic
devices and so on. Even with the introduction of these alarm systems which have reduced
greatly the level of insecurity, there is still a problem of false alarm which needs to be
minimized [1]. In order to effectively reduce the level of insecurity and avoid false alarms
which can create unnecessary unrest, a touch activated security system is required. This system
if properly designed will provide security and ensure alarms are activated only when an
unauthorized person try to gain access to the protected area or device by touching the entrance
or any other part of the device. An alarm is a loud noise or signal for alerting or informing people of danger or a problem. An
alarm system is thus a security system that produces a form of sound to warn people of a
particular danger. The development of alarm systems started with the creation of man. Man
required giving alert information and adopted a form of signaling, exclamation and shouting.
This was later replaced by clapping of hands and beating of gongs by town criers to alert the
community in order to disseminate information in the early African society. All these methods
of raising alert were crude, unreliable and inefficient.