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'] Chessboard (sensor)'
2004\03\08@194452 by Jonathan Johnson

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can you make each square IR transparent? then include an ir port under each
one with an ir transceiver in each piece, add a 1wire address part and away
you go. you can then identify each part and where it is on the board. you
will need to connect your board side ir transceivers in a matrix fashion to
getyour location reference, other than this method rfid would work very well
too provided you could contain your read field.

Cheers

JJ

{Original Message removed}

2004\03\08@203337 by Bob Barr

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On Tue, 9 Mar 2004 11:55:12 +1100, Jonathan Johnson wrote:

>can you make each square IR transparent? then include an ir port under each
>one with an ir transceiver in each piece, add a 1wire address part and away
>you go. you can then identify each part and where it is on the board. you
>will need to connect your board side ir transceivers in a matrix fashion to
>getyour location reference, other than this method rfid would work very well
>too provided you could contain your read field.
>

IR reflection from the bottom of the pieces may be sufficient if you
have a transmitter/receiver pair under each square. From a known
starting arrangement, it shouldn't be necessary to have each piece
uniquely identify itself.

Since a piece will 'disappear' from one square and 'appear' on another
square, you know which piece was moved and where it is now. (This may
not cover all of the cases that can arise but I think it will.)


Regards, Bob

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2004\03\09@001919 by SavanaPics

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May be a bit crude sounding, but what about using a reed switch or hall
effect sensor undereach square. then put a round magnet under each chess piece ?
You can wire the sensors in an x/y matrix similiar to a keypad arrangements.
just expand the  the units to include each row and each column.  This will give
you the sense reporting you need. You can then have the software trach the
movement from say square  A2 to say A4 indicating the movement of a pawn


Just a thought.

Eddie Turner, kc4awz

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2004\03\09@051123 by Mike Harrison

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On Tue, 9 Mar 2004 11:55:12 +1100, you wrote:

>can you make each square IR transparent? then include an ir port under each
>one with an ir transceiver in each piece, add a 1wire address part and away
>you go. you can then identify each part and where it is on the board. you
>will need to connect your board side ir transceivers in a matrix fashion to
>getyour location reference, other than this method rfid would work very well
>too provided you could contain your read field.

One way would be for each piece to have a tuned circuit at a different frequency, and a coil under
each square - you could probably use PCB coils, so the chessboard would be a large PCB with 64 coil
patterns, and each piece would contain a small PCB in the base, with different capacitors to tune to
different frequencies and/or coil taps to chenge the inductance.
An analogue multiplexer would switch the board coils sequentially to a circuit that sweeps a
frequency to look for resonances. You may also be able to arrange to drive all the coils
simultaneously (or a row at a time) and use a mux to switch the inputs, which might simplify things.
If you want to get clever you may be able to use a multiplexing method to simplify the electronics -
e.g. excite a row and read the 8 column amplitudes.  
I think this would probably be the cheapest solution, and ought to be workable (remember you only
need a different frequency for each type of piece (e.g. all white pawns would be the same).
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2004\03\09@065551 by Michael J. Pawlowsky

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What happends when a piece get's eaten?


>Since a piece will 'disappear' from one square and 'appear' on another
>square, you know which piece was moved and where it is now. (This may
>not cover all of the cases that can arise but I think it will.)

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