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Old 11-12-09, 09:04 AM   #1
thompsonpost
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Would you trust this product?

I have no dog in this race, so this is not promotion, just an interesting device.
Secret Knock Detecting Lock
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Old 11-14-09, 04:39 PM   #2
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Actually that's a pretty cool device. You'd have a hard time keeping the knock pattern secret from your neighbor's though. I could see that device being useful in other locking applications.
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Old 11-14-09, 04:46 PM   #3
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Interesting device but many strangers who come to ones door will use that knock to be cute and end up letting themselves in when no one is around.
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Old 11-14-09, 06:00 PM   #4
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Next year this time, you'll be able to buy it for not $49, not $39 but $29! But wait, there's more. Call within the next 10 minutes and we'll send you two, for the price of one. And the first 100 callers will receive, free, a gargoyle door knocker.

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Old 11-14-09, 07:39 PM   #5
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It would be good for an isolated area, where many people or a certain group would need to get in and might not have a key (emergency shelter, storage unit).
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Old 11-14-09, 07:50 PM   #6
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It is an awesome microcontroller project... but my home's entrance is better off with a key.
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Old 11-14-09, 10:06 PM   #7
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It is an awesome microcontroller project... but my home's entrance is better off with a key.
simple is best sometimes
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Old 11-14-09, 10:11 PM   #8
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Thats pretty dang cool.
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Old 11-14-09, 11:05 PM   #9
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hows that work anyway?
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Old 11-15-09, 12:57 AM   #10
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What happens if the battery goes dead while you're gone? Do you still have a key to override it?
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Old 11-15-09, 07:05 AM   #11
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What happens if the battery goes dead while you're gone? Do you still have a key to override it?
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Old 11-15-09, 07:37 AM   #12
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hows that work anyway?
Batteries and stuff. (Is it ok to use punctuation and upper case letters in this thread?)
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Old 11-15-09, 04:44 PM   #13
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What happens if the battery goes dead while you're gone? Do you still have a key to override it?
I see safe locks get around this by two methods:

1: Key override. Bad thing is that unless the lock is a high security lock (and I'm meaning high security, not the cheap wafer tumblers used in file cabinet locks), then this will be the weakest point. Recommendation: A lock like the Mul-T-Lock Cliq or the Abloy PROTEC/Cliq. Both combine top of the heap pick resistance with an electronic part of a key.

2: A set of contacts on the outside of the lock that one can touch a 9 volt battery to as a way to open the lock if there are no batteries. I have seen some safe locks that have conductive rings around the open/denied LEDs just for this exact reason. Only bad thing is that a vandal can zap the lock with 120VAC real easily.

Me, if I made a lock that responded to taps, I'd include a high security key override.
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Old 11-15-09, 05:20 PM   #14
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This is indeed pretty cool.

I would use it in party contexts, other than that it seems like it could be a pain in the ass and the "secret" knock sequence could easily be identified by neighbors.
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