AT89C51-based Telephone Remote Control System
Abstrac：The design of the system, a telephone remote control system. AT89C51 single-chip microcomputer system and the DTMF decoder IC MT8870 as the core, through the telephone line remote control multi-channel intelligent controller. During the design process, the system through the hardware detection circuit ringing, hang up automatically pick, DTMF decoding, control electronics, voice prompts and other functions, and software to complete the sound signal count, password detection and other functions. The system uses existing telephone lines for communications, reliable, low cost, easy to operate, applicability, can be widely used in household appliances or other places of the various control equipment.
key words: AT89C51 single-chip microcomputer; voice chip; telephone remote control; DTMF decoding; ring detection.
