Design of home burglar alarm based on MCU and PIR sensors

Along with the progress of The Times, anti-theft doors and Windows and civil air defense the way it is difficult to meet the needs of the People's Daily to prevent, pyroelectric infrared sensor due to its rapid development, relatively mature and the price is low wait for an advantage, application is more and more widely, based on pyroelectric infrared sensor with single chip microcomputer made home burglar alarm has good prospects for development. This design aims to develop a home anti-theft alarm based on MCU. This design intends to use the STC89C52 microcontroller produced by STC MCU Limited as the core device, in order to achieve the alarm design with infrared home anti-theft function. Because pyroelectric infrared sensor device has the function of detecting human body or animal by emitting infrared ray and converting detection information into corresponding electronic signal, this sensor is used for this alarm. The alarm system supports two different working states: manual emergency alarm state and deployment alarm state. In the state of manual emergency alarm, when the user presses the alarm button, the alarm will immediately sound and light alarm; In the deployment and alarm state, when the user presses the deployment button, the system triggers the sensor to work and monitor the deployment area. When an intruder is found, the sound and light alarm is triggered.