card lock system

[fsl]

Hi every body,
I am new here and want a help from you experts,
well, I am trying to make a card lock for my cupboard.. using ??? card

could any body help me out pleeeeeeeeeeeeeeeeeeeeeeeez

 

[Nigel Goodwin]

Hi every body,
I am new here and want a help from you experts,
well, I am trying to make a card lock for my cupboard.. using ??? card

could any body help me out pleeeeeeeeeeeeeeeeeeeeeeeez

What sort of card system are you looking for?, and how secure does it need to be?. I would suggest three alternatives:

1) Simple punch card.

2) Magnetic strip card.

3) Smart card - which holds it's own processor.

Option 1) is very simple to do, essentially electical rather than electronic, but the other two really require micro-controllers.

BTW, congratulations on your wonderful Grand Prix today!.

 

[DigiTan]

If you're looking from something basic, this page uses an AVR microcontroller to read symbols from an ISO card reader. This one uses the same AVR to control a lock on a password match/password fail basis. You could combine the two to build something like what you describe. It can be used to read anything from credit cards to a drivers license or any card with unique content.

Proximity cards are also catching on but I'm unable to find a cheap source on these. Jonathan Westhues has a cool page on building prox card systems from discretes.