CHAPTER ONE
INTRODUCTION
1.1 Background of Study
Due to the stress and risk of controlling electrical appliance in the school
building at night, we are motivated to design and build a central wireless
remote switch for the electrical and electronic department. A central wireless switch for electrical and electronic appliance is an electronic device specially designed to use GSM mobile cell phone to shut down electrical power supply to the entire appliance in the EEE general office where there are ugly power situations such as fire outbreak, lightning strikes, switching surges, transients, neutral failure and other abnormal conditions or malfunctions that can destroy lives and properties. Ndubuisi (2011).
The system implements the emerging applications of the GSM technology
which enable the users to carry out some task from anywhere in the world via a GSM network. The system is made up of a GSM amplifier unit, PIC12f629 micro controller, power control and a power supply unit. These sub circuits are designed using passive and active electronic components like capacitors, resistors, diode, regulators, transistors, electromagnetic relay, microcontroller and battery.
 New age of technology has redefined communication; Most people nowadays have access to mobile phones and thus the world indeed has become a global village. At any given moment, any particular individual can be contacted with the mobile phone. But the application of mobile phone cannot just be restricted to sending SMS or starting conversations. New innovations and ideas can be generated from it that can further enhance its capabilities. Technologies such as Infra-red, Bluetooth, etc which has developed in recent years goes to show the very fact that improvements are in fact possible and these improvements have eased our life and the way we live. Remote management of several homes, offices and the school appliances is a subject of growing interest and in recent years, we have seen many systems providing such controls. Appliances of a certain location
are eliminated with the use of this system. These days, apart from supporting voice calls a mobile phone can be used to send text messages as well as multimedia messages (that may contain pictures, graphics, animations, etc).
Sending written text messages is very popular among mobile phone users. Instant messaging, as it is also known, allows quick transmission of short messages that allow an individual to share ideas, opinions and other relevant information. We have used the very concept to design a system that acts as a platform to receivemessages which in fact are commands sent to control different appliances and devices connected to the platform. We have designed a control system which is based on the GSM technology that effectively allows control from a remote area to the desired location. The application of our suggested system is immense in the ever changing technological world. It allows a greater degree of freedom to an individual whether it is controlling their appliances or office equipments. Shizhuang (2007)
There is no need to be physically present in order to control. I have implored the use of both hardware and software to bring about the entire project. The hardware components are solely coordinated by the micro controller chip while the c programming language is used to program the chip.
1.2 Statement of Problem
Surge may occur in power line which may damaged a lot of
sensitive electrical and electronic appliances in various homes and offices. When the occurrence is not being solved or controlled it may lead to sudden explosion and fire outbreaks. And in most cases the users of the electrical appliance are busy and may not be close to switch-off the appliances when surge occurs. Also, it is also stressful to do the monitoring and switching off the load. Hence, the need for using a remotely controlled device for electrical appliances so as to be able to control the appliances for safety.