Abstract
As time progress, People more and more hope a safely living space for the increasing crime of embezzling and looting. The traditional security doors and Windows can not meet the People's Daily requirements, So people urgently needs a household intelligent safety alarm system. At present, all kinds of guard against theft, security alarms are based on the ultrasonic, active infrared emission/receiving and microwave technology in china. But, in this designing,we using Passive infrared alarm is American Sensing elements -- pyroelectric infrared sensors. This kind of pyroelectric infrared sensors can use the non-contact form to detect the infrared radiation of Human body, and changes it to become the voltage signal. At the same time, It also can identify the biological and other non-living things. Pyroelectric infrared sensor is not only used in the guard against theft and alarm system,but also used in the field of automatic control, proximity switch, remote sensing and so on. Because of the chip has advantages of small size, low price, high integration. To develop the security system based on single chip can make the system easy to operate, and less cost, which has a wide application. So this design we use pyroelectric infrared sensor for signal sensors, STC89C52 MCU for control device, and using a loudspeaker for alarm device.And use labview software for security monitoring.
