As people's awareness of protection and the constant progress of science and technology, there are on the market at present the traditional anti-theft alarm already cannot satisfy the security requirements of people. In order to improve alarm sensitivity and anti-interference ability, strengthens the safety coefficient, this paper designs the intelligent household infrared security alarm system. System consists of control core, singlechip AT89C51, pyroelectric infrared sensor detection module, amplifier circuit, clocking circuit and reset circuit, light emitting diode alarm circuit, voice alarm circuit, LED display circuit and other parts. When someone broke into alarm monitoring area, external pyroelectric sensors produce pulse signal, sound and light alarm circuit, alarm duration of 10 seconds, and if there is a new signal input, start a new test cycle. Manual button can force alarm interrupt. The system is suitable for family, office, warehouse, laboratory, anti-theft alarm, etc, has a certain popularization value.
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