This paper describes a design of intelligence autoalarm system, which based on Public Switched Telephone Network. The core of this system use AT89C52 and DTMF Transceiver MT8888.This system collects alarm signals with the advanced intelligent infrared ray sensor and Proximity sensors. The microcontroller AT89C52 controls MT8888 DTMF transceiver,voice chip APR9600 to give an alarm.The system accomplishes alarm with phone automatically and setting remotely. The system may dials the specific telephone number to report to the police through the telecommunication network when the stranger intrusion occurs and so on in the host family. It is applicable for a family or a factory where it is easy to manage and guard intently.We also show the systemic graphs,part of hardware circuit graphs,and program design graphs.
Key word DTMF、MCU、MT8888、intellective alarm system