Thanks Russell
Google did not help.  I should have thought of Wikipedia.
I want the Weigand effect, not the Weigand protocol.
The short article gives me some ideas.
Cedric
Where can I send a minute honorarium ?

>
> On May 25, 2007, at 11:53 PM, Russell McMahon wrote:
>
> Depends if "Wiegand card readers" is referring to the "real" Wiegand
> wire technology or to the interface of the same name, which is
> technically unrelated:
>
> It appears it's the former from your description. This only provides a
> foot in the door, but ...
> _____________
>
>
> Wiegand wire, basic principle
>
>         http://en.wikipedia.org/wiki/Wiegand_wire
>
> Wiegand effect
>
>     http://en.wikipedia.org/wiki/Wiegand_effect
>
> _______________________________
>
>
> Wiegand interface and protocol which is *NOT* directly related to the
> above technology but may be used with it
>
>         http://en.wikipedia.org/wiki/Wiegand_protocol
>
>         http://en.wikipedia.org/wiki/Wiegand_interface
>
> Roll yer own PIC controller
>
>         http://www.remember.ro/scripts/wiegand.php
>
> Interface definition
>
>         http://www.remember.ro/dl/wiegand/wiegand.pdf
>
>
>
>
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