基于單片機(jī)的汽車防盜報(bào)警系統(tǒng)設(shè)計(jì)中英文參考資料(存儲(chǔ)版)
【正文】 障礙物。但隨之而來的機(jī)動(dòng)車輛被盜的案件也逐漸增多，造成了駕駛員經(jīng)濟(jì)財(cái)產(chǎn)的損失。 If some people approach the automobile to enter the cab, the examination actual distance is smaller than or was equal to when reference value 80cm, through monolithic integrated circuit and the port, actuates the indicating lamp display circuit and the sound alarm circuit, sends out three two flash. And triggers a high level, the actuation is wire less signal transmission circuit.Chart 1 Ultrasonic wave transmission circuit Code/decoding principleThe present automobile remote control security system are many is usesVD5026/27, PT2262/72, HT12E/D and so on the general code/decodes the electric circuit, its password decided by the ponent address, each set of security systems use a fixed invariable password. Along with the micro processing technology development, through the receiver emote control transmitting message, may intercept this fixed password, moreover general arranges the decoding address to lose the person to carry the ponent size limit, its quantity is impossible too much, can obtain not repeatedly codes very is also limited, also can very quickly explain the password with the automatic scanner. Therefore, this kind of password fixed invariable automobile security system has received the serious threat. Decodes the automobile security system using the monolithic integrated circuit interior resources realization jump code, it each time uses the remote control password all is changing, with the password no longer duplicates uses, causes the interception password also is makes a futile effort, in addition, it may increase the enough many passwords figure, enhances the system resistance illegal scanning the ability. The remote control coding altogether has 12 bytes, separately by 3 bytes codes channels code, 3 bytes codes forewords number, 5 bytes jumps codes, 1 byte pressed key operation code is posed. Encoded front adds on logic in each byte 0 to take the outset position, encoded behind adds on a logical 1 achievement in each byte to stop the position, and in most front adds on several logic 1 to take the guidance signal, this constituted the serial coded signal which uses in to transmit. The code channel code uses in to express the remote control status。 (3) jumps the code to be equal to reuses the special algorithm to extract changes the code. After the monolithic integrated circuit confirmed receives is the legitimate code, writes the code foreword number in the decoding foreword number, and pletes corresponding operation processing according to the operation code. The decoding channel code and the decoding foreword number also deposits in monolithic integrated circuit EEPROM, guards against because of power cut loses. Security reports to the police realizationIf will have robber Chen ZheRu the room, starts the automobile, after wrong password, then the automobile storage battery +12V voltage, th
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