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Active In SP

Posts: 1
Joined: Jan 2011
07-01-2011, 06:57 AM

I am a 2nd year student.
I want details about this topic as I am planning to do it as my miniproject and implimentation..

I had submitted my abstract..I prefer to use landphone for the same..
This should employ DTMF technique to switch on/off up to nine appliances
(corresponding to the digits 1 through 9 of the telephone keypad). This can be done even during normal conversation...
Also a microcontroller to know present status(whether working or not)..
Can anyone help me please????
seminar surveyer
Active In SP

Posts: 3,541
Joined: Sep 2010
07-01-2011, 09:41 AM

Controlling devices using switches are common. From a few decades controlling devices using remote control switches like infrared remote control switch, wireless remote control switches, light activated switches re becoming popular. But these technologies have their own limitations. Laser beams are harmful to mankind. Some technologies like IR remote control are used for short distance applications. In such case if we have system which does not require any radiations or which is not harmful, long remote control switch!! Yes here is the solution. Here I am introducing such a system which does not require any radiations, any laser beam which has no limitation of range, I mean it can be used from any distance from meters to thousand kilometers using a simple telephone line or mobile phone.
A telephone line-switching device comprises first and second switches that interlock and a lock plate extending between the two switches. The push member of the first switch has a cam with which the lock plate usually engages. The push member of the second switch has an inclined portion on which the lock plate always bears. As the push member of the second switch is depressed, the inclined portion horizontally moves the lock plate, permitting the lock plate to disengage from the cam to release the first switch.

For more: and implimentations/basic-electronics/device-control-using-telephone/


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