Sensors activated by smart card?

Question

Dear All,I am working on a project at home which involves getting a smart cardto 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 correctpressure pad. The pads are made of Piezo-film and when the wrong oneis pressed or not pressed a small beeping sound is emmited. When onlythe correct pressure pad(s) is pressed, the beeping stops. This is tobe controlled by a smart card. When the card is inserted it will tellthe device which pressure pads are supposed to be pressed. Oh, it alsohas to be quite small.My problem is that I don't know what components to use or how to wirethe device correctly.If anybody has a solution or part solution, I would be very greatfull.Sincerly,Steven MacDonald

Wim Ton · Accepted Answer

Maybe more for the  group.On of the simplest solutions is to use a memory smartcard and amicrocontroller.You alse can use a ISO7816-3 smartcard, but the communication is moredifficult, 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 feedbackafter every wrong button, but only after the total (commonly 4 or more) anduse a retry counter.When using a ISO7816-4 smartcard, this is already handled by the PIN(personal indentification number) commands.Wim

CWatters · Answer

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...

formatting link

(Not my site)

Colin

Sensors activated by smart card?

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