The design is a wireless burglar alarm system controlled by single chip microprocessor. Its main use is family anti-theft warning. This system contains two major parts, the wireless transmission circuits and wireless burglar alarm reception circuit. PT2262 is used as coding chip and PT2272 as decoding chip to ensure the accuracy of receiving warning signals and prevent interference from other radio signals. Sensors uses door and window type as "watchdog". Once someone illegally open doors or open windows, the "watchdog" immediately launched through wireless transmission circuits. The wireless reception circuit which placed elsewhere receive warning signal and then single chip microprocessor control alarm.

Encrypting code modulation of 315M UHF radio transmission technology is used in launching and receiving. Its performance is reliable and easy to use, without wiring. And with the use of remote-control, it is also easily to retreat and restore the detector’s warning function. Compared anti-theft detectors cable, wireless security warning is particularly suit to the long distance wireless control for the site security.

 

Keywords: wireless burglar alarm system; coding modulation; wireless control