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I'd like to start playing with electronic locks. But how would I control it? Answered

I'd like to start playing with electronic locks. I'm looking at this type of thing. (ebay item # 200260301195). But how would I power it (I'm in the UK) and how would I control it? For example how could I use a cheap chinese remote control or a basic fingerprint reader or a keypad? Thanks!



10 years ago

That lock looks to operate in one of two ways:
Most likely: (theres a spring on the solenoid)
Spring-loaded operation: stays locked unless power is applied, OR
Applying 12vdc in the unlock polarity to the + and - on the lock to temporarily un-latch it. Voltage removed = lock relocks.

OR (not entirely sure from those photos)
'stable' operation, where it stays where you put it, locked or unlocked.

Applying 12v in one direction will unlock, applying in opposite polarity moves solenoid in opposite direction, relocking.

Pins 3 4 and 5 are just feedback, telling anything you hook up to it that the lock is locked or unlocked - use to light a light for reminder, etc.

Controller =
an all-in-one unit for a fingerprint scanner would have a 'relay output' to hook up 12 volts to the lock.

Lastly, this is a cabinet lock, it wouldn't be too useful on an entry door as a main means of security.


Answer 10 years ago

Hi Frollard! Thanks a lot for your response. Really good. Would you be interested in holding my hand through putting a basic system together? I'd like to use cheap parts from eBay/China to build this as a learning exercise. If not, perhaps you would be so kind as to answer this joint-question: What search terms should I use to find a power supply for this? I'm in Europe so using a European plug. Or could I power it from a battery? And then the next thing is control. I'd love to control it with a cheap keypad or better yet a fingerprint scanner - but how do I find a cheap example that I know will work? Thanks!


Answer 10 years ago

the lock at its very most-basic, runs on 12 volts dc. Applying 12vdc one polarity on pins a and b will move the solenoid one direction (in spring loaded operation) then when you remove it, it will relock. To accomplish this you need 12 volts worth of batteries (take your pick, 9 AA's, a 12vdc wall-wart rated for at least 500mA (amperage is a guess, but a safe bet - it'll only be used momentarily. If/when you get it, experiment by applying 12 volts by temporarily touching wires to the lock and see what happens. Once you're sure of how it operates, you can then build a circuit that works with an electronic securing mechanism.