Community alarm system design based on MCU and GSM

In this paper, we use GSM mobile network that is the most reliable and matured in this day to achieve community alarm system. And it will directly convey the alarm news in short message or telephone at manager´s mobile phone. The design includes hardware and software parts. Its hardware uses MCU AT89C52 series as the core, and controls three alarm parts, they are infrared monitoring alarm system, alarm displayed on LCD, and GSM module. The system adopted passive infrared sensor to detect, and it turned the traditional network security and anti-theft window into the invisible network, so as to timely handle accidents. When the accident happened in the community, the infrared sensor module sends out the alarm signal to the micro-controller, single chip microcomputer receives the signal through the GSM module to send the message immediately to the manager, and then managers to take immediate measures, the site security alarm and remote alarm can be achieved simultaneously.