Help me get started with electronics
April 2, 2009 1:31 AM Subscribe
DIY RFID door lock.
posted by dance to technology (5 answers total) 2 users marked this as a favorite
I've been wanting to play around with RFID for a long while, and so I've bought an electronic cabinet lock to teach myself a bit of soldering and basic electronics.
Facts about the cabinet lock:
-Works on 12v ac/dc
-Has five contacts: 1+2 12v; 3 n/open; 4 n/closed; 5 common
I'd like to buy an RFID kit to control the lock. But I have a couple of questions.
1) Would I need two power supplies, one for the RFID kit and one for the cabinet lock, or would one power supply power both?
a) What search term do I need for a power supply? All the power supplies I've seen don't have cables with soldered tips, they have plugs for sockets like mobile phones
b) Could I run it from batteries, how would I work out the life-span of the battery when I don't know the amperage draw of the cabinet lock?
2) Does n/open and n/closed refer to normally open and normally closed? Should the device be wired so that that 1+2 (12v) constantly gets supplied with 12v, but either 3 or 4 (depending on wished for functionality) gets supplied with current briefly and the lock does its stuff. I have no idea what common might be. Apart from that the lock apparently has a built-in microswitch to output to LED etc and that it could conceivably be that.
Could anyone recommend an RFID kit to power this? I've seen an $18 kit on eBay but it required modifying the PCB to actually do anything other than just recognise key fobs. But that's ideally the price bracket I'm looking in! It's what the cabinet lock cost!