The Design and Realization of Gas Alarm System On AT89C52
Student majoring in Automation
Tutor
Abstract:A remote telephone alarm system is introduced from the hardware design and software constitution in this paper. AT89C51 single-chip is used as MCU. EEPROM memorizer is used to stored telephone number and DTMF chip MT8880 is used as dial-up chip. When danger exists, the detector will give the interrupt request to the single-chip, and then simulation of extraction machine will be achieved by single-chip control of telephone interface circuit. Automatic dial-up will be carried out by DTMF dial-up circuit. The pre-recorded voice information will be played by the voice circuit so as to achieve voice alarm. And the users can set and change the automatic dialed telephone numbers by keyboard. It belongs to intelligent alarm monitoring device .It is convenient and flexible.
Key words: MCU AT89C51;Automatic alarm system;DTMF Dial-up;