How about a 3 x 4 matrix keyboard combination lock that will trigger a garage door opener or a burglar alarm or whatever. You can even input a temporary code that will survive a power outage. I have a circuit board design if you are interested.
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Keyboard lock
How about a 3 x 4 matrix keyboard combination lock that will trigger a garage door opener or a burglar alarm or whatever. You can even input a temporary code that will survive a power outage. I have a circuit board design if you are interested.
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