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Vol: 48(62) No: 1 / March 2003 Telephone Interface for Home Automation Systems T. Ionica Department of Automation and Industrial Informatics, "Politehnica" University of Timisoara, Blvd.V. Parvan 2, 300223 Timisoara, Romania, phone: +40256-403245, e-mail: tionica@aut.utt.ro C. Balint Department of Communications, University "Politehnica" of Timisoara, Blvd.V. Parvan 2, 300223 Timisoara, Romania, phone: +40256-403310, e-mail: cbalint@etc.utt.ro Keywords: telephone interface, DTMF, call progress, microcontroller. Abstract This paper presents the design and development of a telephone interface controlled by 80C552 microcontroller. The interface is based on M8880 Dual Tone Multi Frequency (DTMF) integrated circuits and it is connected to telephone line like any normal telephone sets. The system is used for two basic functions. First, recognition of telephone call and receiving DTMF signals which can be used to remote control for a range of home appliances. Second, to initiates a call (in DTMF or pulse dialing) to a specified number following the call progress tones, and to send a DTMF tones to a called station to indicate an event produced in system. References [1] G. Niculescu and L. Ioan, Tehnici si Sisteme de Comutatie, Editura Matrix Rom, Bucharest, 2000. [2] T. Ionica, Microprocesoare si Microcontrolere, Ed. Solness, Timisoara, 2001. [3] I. Coskun and H. Ardan, “A remote controller for home and office appliances by telephone”, IEEE Trans. on Consumer Electronics, vol. 44, no. 4, Nov. 1998. [4] *** M8880 Data Sheet, www.teltone.com. [5] *** ITU-T Recommendation E.180, “Technical characteristics of tones for the telephone service”. |