Design Of Pyroelectric Infrared Alarm

With the rapid development of society, people require the sound property safety. It becomes a key issue and urgent requirement how to design the highly-sensitive and reliable anti-theft alarm (ATA) in consideration of easy installation, low cost and duration of wearing. For pyroelectric infrared detection technology, the pyroelectric infrared sensor is used as a probe to detect the specific-wavelength infrared signal emitted from human body for detection in a non-contact further distance. This technology features wide measuring range, quick response, high sensitivity, strong anti-jamming, and safety and reliability. So, with high performance and lower power consumption, MSP430 series of MCU is used as the micro controller in the design, and the new pyroelectric infrared alarm is designed based on this micro controller.In the paper, the specific method for the system design is given on the basis of a basic principle of pyroelectric infrared alarm. Combining with the technical characteristics of the present pyroelectric infrared alarm, a new pyroelectric infrared alarm is developed based on MSP430 MCU with the low power consumption, high performance and high reliability. This paper gives overall design framework of the system hardware, hardware design of each module, software design ideas and major software program. Meanwhile, by analyzing accuracy of influence factors for the system alarm, the corresponding measures is taken so as to improve the system anti-interference, and the main work is as follows:The research and its practical significance are elaborated on domestic and foreign pyroelectric infrared alarm; the principle of pyroelectric infrared alarm is introduced, and current pyroelectric infrared alarm construction, layout and installation requirements are analyzed; MSP430 Series of single chip microcomputer is used as the micro-controller in the design. After analysis on systematic functions, the overall design scheme is put forth, and systematic hardware is designed. Moreover, the design and its method for the functional units are analyzed in detail. Both the whole design flow and the developing environment are rendered, and operation for all functions is introduced in the form of flow chart. According to the interference problems in the system, the corresponding anti-interference measures are taken to design; Finally, the summary to this research is done, and the further research on the designed system are prospected.