The design of infrared bug
Abstract：The infrared bug mainly makes use of the infrared ray to transmit controlling singles in order to realize the remote controlling alarm. According to the infrared bug’s principle, I design a bug based on the eradiating and receiving of the infrared ray. Exteriorly by using eradiate circuit, key circuit, receive circuit, encode and decode circuit and power circuit to realize the bug control. Among these circuit units, encoder circuit and eradiate circuit come to an organic entity which use PT2262 as the encoder to radiate high frequency carrier wave (315MHz). After encoded, the address codes, data codes and in-phase code will be eradiated with the carrier wave. As same as the encode and eradiate circuit, the decode circuit and receive circuit compose an organic entity used to receive singles radiated by the infrared eradiate circuit. After decoded, the singles change to the needed bugle. PT2272 is the core of the decode circuit as the decoder whose working frequency is 315MHz. In addition, the system’s working voltage is 12V.
Keyword：infrared annunciator bug encoder decode
