A remote controller for home and office appliances by telephone

This paper describes the design and development of a phone -based remote co ntroller for home and office automation. The circuit is designed based on t he Turkish telephone standards and connected to the telephone network just like any normal telephone sets. Any tone dialing Dual Tone Multiple Frequen cy (DTMF) telephone set or hand -held tone dialer may be used to send comma nds to the control unit, and remotely control, a wide range of mains applia nces in homes and offices. The designed circuit can also detect user identi fication number for prevent non-authorized use of the control unit. The fee dback signal informs to the user about the results of commands.