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Replacement code lock for LS7220 base systems

Posted on Tuesday, February 26th, 2013 in code by DP

lockchip_dip18

Dilshan Jayakody presents an alternative design for LS7220 base code locking systems:

LS7220 is a “hard-wired” code-locking system, but this simulated system provides both “hard-wired” and customizable (re-programmable) code locking options. This re-programmable feature provides some higher degree of protection to the system and it allows user/administrator to change system’s code at any given time by without changing the wiring layout(s) of the system.

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  • Craig B: Shouldn't the default be 00xxx010? Note that bit 0 appears out of order in the documentation. In that case I think the initial value is...
  • JJM: From the datasheet extract you are showing, the power up status should be 00xxx010, not 000xxx01. Bit numbering is misleading since 'measurement resolution' is apparently...
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  • Travis: Is it preset to the windows 3 fingered salute?
  • Glenn: What a cool idea !