ABSTRACT
The purpose of this project is to design and construction of a central wireless switch for electrical and electronic appliances. A central wireless switch for electrical and electronic appliance is a GSM based online power control switch system that controls the entire appliance in the EEE general office using GSM network. It will act as an embedded system which would monitor and control appliances and other devices locally using built-in input and output peripherals. This device can control the inflow of electricity power supply in a building or turn off the equipments when there is emergency using a GSM cell phone. The device consists of a special arrangement of GSM signal amplifier, PICl2f629 micro controller (the peripherals interface control), capacitors, resistors, diode, regulators and electromagnetic relay to effect power switching. After successful design of the system various sub sections of it were tested for efficiency and proper functioning. The results confirm that the system is ok.
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