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Sensors activated by smart card?

Dear All,

I am working on a project at home which involves getting a smart card to control a circuit. Here is the what I want to do:

I want to make a device that tells you if you are pressing the correct pressure pad. The pads are made of Piezo-film and when the wrong one is pressed or not pressed a small beeping sound is emmited. When only the correct pressure pad(s) is pressed, the beeping stops. This is to be controlled by a smart card. When the card is inserted it will tell the device which pressure pads are supposed to be pressed. Oh, it also has to be quite small.

My problem is that I don't know what components to use or how to wire the device correctly. If anybody has a solution or part solution, I would be very greatfull.

Sincerly,

Steven MacDonald

Reply to
Steve
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Maybe more for the alt.tecnology.smartcards group.

On of the simplest solutions is to use a memory smartcard and a microcontroller. You alse can use a ISO7816-3 smartcard, but the communication is more difficult, you will have to use a form of UART, in hard- or software. If you want to use the device for security, you should not give feedback after every wrong button, but only after the total (commonly 4 or more) and use a retry counter. When using a ISO7816-4 smartcard, this is already handled by the PIN (personal indentification number) commands.

Wim

Reply to
Wim Ton

The protocol used to talk to simple gold contact types is typically serial in nature and easily implemented on a small micro of some sort (eg a PIC). That micro could easly handle the keypad as well so you have a single chip solution right there.

This site has a brief overview of smart cards and links to useful stuff including code fragments here...

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(Not my site)

Colin

Reply to
CWatters

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