U flash disk door control system
An access control system and signature information technology, applied in instruments, time registers, individual input/output port registers, etc., can solve the problems of easy damage to access control, easy loss of keys, easy damage of magnetic cards, etc., to save steel resources Effect
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[0020] The system can be divided into three parts: U disk part, information processing part, wireless receiving part, which is composed of U disk, U disk reading circuit, single chip microcomputer and peripheral circuit, serial port communication circuit, GSM wireless receiving module and so on.
[0021] The realization steps of the present invention are as follows:
[0022] When the U disk is inserted into the access control, the information reading circuit composed of the general interface chip CH375 of the USB bus will automatically search for the signature information in U shield.c in the root directory of the U disk.
[0023] The signature information is input through the IO port of the MCU with STC89C52 as the processor and compared with the preset signature information in the program. If the verification is passed, a level signal is output through the IO port of the MCU to control the relay to close the electromagnetic lock circuit to open the access control; if the veri...
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