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DTMF BASED DEVICE CONTROLLING SYSTEM


Posted by: smart paper boy
Created at: Saturday 18th of June 2011 06:18:07 AM
Last Edited Or Replied at :Thursday 26th of January 2012 10:08:41 PM
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OGY.
The main function of the system is to control any electrical devices through mobile phone. In this concept two mobile phones with different service numbers are used, the control phone at receiving end, where the appliances are controlled is interfaced with microcontroller unit which controls the devices through relays.
To achieve this, the output of the mobile is amplified and fed to DTMF (Duel Tone Multi Frequency) decoder chip, which generates binary code according to the received information from the other mobile phone. After establishing a communication link between the two mobiles..................[:=> Show Contents <=:]



DTMF BASED DEVICE CONTROLLING SYSTEM


Posted by: smart paper boy
Created at: Saturday 18th of June 2011 06:18:07 AM
Last Edited Or Replied at :Thursday 26th of January 2012 10:08:41 PM
mobile phone dtmf controlled electrical device switching existing system , dtmf based electrical device switching, dtmf based project , dtmf based device switching, dtmf used for controlling devices , seminar on dtmf technology, device control using mobile phone using dtmf technology , device control using dtmfcode, dtmf device control in electronics microcontroller , electronics devices using dtmf, dtmf based device control , dtmf based projects, sample program in keil c action of dtmf decoder , device control through mobile useing dtmf, seminar on mobile controlling devices , project on dtmf control of devices, dtms based project , dtmf devices, dtmf baseb ,
After establishing a communication link between the two mobiles by dialing the home mobile number, the corresponding keys of calling phone must be activated to generate different DTMF signals. Based on this signals, the DTMF decoder generates different binary codes through four outputs, and this data is Fed to the microcontroller. Now the program is prepared for the microcontroller to energize or de-energize the corresponding relay based on the code produced by the DTMF decoder chip.
Software:
1) Keil C
2) ORCAD/Express PCB
Hardware:
1) Micro controller.
2) DTMF
3) LCD mod..................[:=> Show Contents <=:]



DTMF Based Device Control


Posted by: seminar class
Created at: Monday 11th of April 2011 06:02:50 AM
Last Edited Or Replied at :Monday 29th of October 2012 03:31:26 AM
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trol the logic of almost all digital devices, from clock radios to fuel-injection systems for automobiles.
1.3.1 Three basic characteristics differentiate microprocessors:
 Instruction set: The set of instructions that the microprocessor can execute.
 Bandwidth : The number of bits processed in a single instruction.
 Clock speed : Given in megahertz (MHz), the clock speed determines how many instructions per second the processor can execute.
In both cases, the higher the value, the more powerful the CPU. For example, a 32-bit microprocessor that runs at 50MHz is more p..................[:=> Show Contents <=:]



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