26-05-2012, 04:01 PM
ELECTRICAL APPARATUS CONTROLLING USING MOBILE PHONES
ELECTRICAL APPARATUS CONTROLLING.doc (Size: 40 KB / Downloads: 52)
ABSTRACT:
The main scope of this project is to control the functionality of the electrical Devices from a distant place. This application controls the appliances using DTMF Technology. It involves usage of two cell phones. One phone is connected to this embedded device in conjunction with industrial machines. Another phone is used to give commands to the destination. When a call is made from the source, the phone at the destination gets automatically lifted. The electrical devices start functioning according to the commands received by the phone at the destination.
The development of this application requires the configuration of the microcontroller architecture, and debugging of the application program. This is extensively used in industries.
Power Supply Unit:
Power supply unit is used to provide a constant voltage of 5V to different ICs. This is a standard circuit using external 12V DC adapter and fixed 3-pin voltage regulator.
Micro-controller:
Atmel or Phillips 89C51, 8-bit Micro Controller from MCS-51 Intel family, with 4k bytes of flash memory and 128 Bytes of internal RAM is used. It has a 40-pin configuration and other components are interfaced to its ports. The entire functionality of the GSM Domestic Automation is under the control of Micro controller. The Micro controller takes input from the external sources and routes them to the appropriate devices as programmed in it.
DTMF:
The sounds used for touch tone dialing are referred to as Dual Tone Multiple Frequencies (DTMF) tones. Each number as well as the "#" and "*" is represented by a pair of tones. The HT9170 series are Dual Tone Multi Frequency (DTMF) receivers integrated with digital decoder and bandsplit filter functions.