Abstract:
known that any electrical appliance is controlled manually by a switch that controlling the on/off of electrical device. The aim of this thesis is to design and implementation of a system that control the electrical appliances via mobile phone. System contains two parts, remote controller (mobile phone) and control circuit containing microcontroller (Atmega16), Dual Tone Multi Frequency (DTMF) decoder, ULN2803 darlington driver, relays, mobile phone as well as for devices to be controlled. The system has a mobile phone installed in control circuit, when a user dials the number of the phone, the system automatically answers the call then waits for the user to press the command button. The receiver phone receives the DTMF signal and sends it to the microcontroller after processing with DTMF decoder. Then the microcontroller, based on the received signal, controls the different relays connected through ULN2803 (Darlington transistor) and triggers the required appliance. The mobile phone will operate outdoors a whereas the control unit will operate indoors. Also Proteus software is used for system simulation. The remote unit (mobile) remotely controlled (turned off /on) the electrical device successfully.
