PC remote control of appliances by using telephone lines

The idea of home automation using telephone lines and a PC is shown. The system is based on the dual tone multifrequency (DTMF) signals that could be sent through a loop of wire to switch on/off various appliances via a personal computer (PC). The system hardware and software are designed based on the telephone standards. The hardware includes the DTMF receiver, on/off hook detector, ring detector and an input/output PC interfacing card. An example of controlling an appliance is provided. The software control programming is written in Turbo Basic and their flow charts are presented.<
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