With this any home appliance can be operated via mobile phone by using either GSM or CDMA technology.
One cell phone is used by the user and the other cell phone is placed near the home appliance which is to be [url removed, login to view] each key in the keypad of the mobile phone has its own Double tone mutiple frequency(D.T.M.F.)which is transmitted by the user's cell phone and received by the cell phone that is kept near the home [url removed, login to view] signal is fed to the microcontroller and a particular key int the keypad of used mobile is fixed for selecting particular home [url removed, login to view] device can only be enable by a secret code.
At first the user will call the cell that is kept near the home appliance which is kept in auto receive [url removed, login to view] user will then punch a secret code which enables the device.
Particular code is assigned for a particular home appliance which is well known by the [url removed, login to view] by puching code a particular device is selected and it can be turned on or off as per required.
Now lets see how does it work,when the user pressing a key in the keypad of his cell,a particular double tone multiple frequency is transmitted via GSM or CDMA technology ,this signal is then decoded by the a decode kept near the home appliance which will generate a 4-bit [url removed, login to view] button of the keypad is capable of generating a particular 4-bit signal.
This signal is then fed to the micro-controller,where with the help of a code,a particular code is set for a particular [url removed, login to view] output from the micro-controller is fed to the AC switches or relay to control the logic operation and to operate the home appliance.
Ac switches or relay are used because the micro-controller works in dc environment and home appliance work in ac environment,so AC switches are used which is triggered by the micro-controller and get the power from the AC source and provide Ac output to the home appliance.
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I am guessing this is a Novelty/Patentability search Project. I have >2 years experience in handling such projects and i would be glad to do this project for you.