Electronic access control device utilizing a single microcomputer integrated circuit

  • US 5,617,082 A
  • Filed: 11/15/1994
  • Issued: 04/01/1997
  • Est. Priority Date: 11/15/1994
  • Status: Expired due to Term
First Claim
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1. An electronic access control device comprising:

  • an input device adapted to receive a value input via the input device;

    a storage device containing at least one access code;

    means for output;

    a processor;

    a comparator electrically connected to said processor for comparing the at least one access code to the value input received via the input device;

    said processor activating the means for output when the access code equals the value input received via the input device;

    said processor having at least one port which serves both as an input and an output, and said processor connected to said input device and said means for output, said processor activating the output when the input device is not receiving the value input, and said processor multiplexing the input device and the means for output by connecting said means for output with said input device by way of;

    (1) a first electrical connection of the input device to the at least one port of the processor; and

    (2) a second electrical connection of the means for output to the at least one port of the processor.

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