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Home › Magazines › 2005 › July › Code Lock with One Button

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Code Lock with One Button

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Published in issue 345, July 2005

Code Lock with One Button
The unusual feature of this code lock is that it can be operated with just one pushbutton. In situations where a tamper-proof solution is required this circuit has a great financial advantage: only one robust pushbutton needs to be bought. The disadvantage of this solution is that it takes a little longer to enter the code.

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The circuit diagram should be modified to show a common-cathode (CC) display in position LD1. A suggested type is the LITE-ON LSHD-5503. Supply decoupling capacitor C1 is not shown on the component overlay and may be fitted at the underside of the board.

Click below to download a PDF copy of this article from Elektor magazine.

 

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PDF Article (040481-UK.pdf)
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PCB layout (040481-PCB.pdf)
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Order from Elektor 
PIC16F84, programmed
040481-41 (USD 11.70)
PCB, bare
040481-1
 

Order from Eurocircuits 

PCB, bare
 

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040481-11.zip

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Please note. In view of the complexity of international markets, Elektor cannot guarantee the availability of components for this project.

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