How electronic chessboards works

[spreadfan]

In a sense I am curious to know how the DGT Chessboard works (http://www.dgtprojects.com/eboard.htm). Can someone explain this to me?
In great details, please..

[floodzone]

AFAIK, all of them. I know for sure the Ivan 2 and the Chess Station work this way..

[spreadfan]

The chess particularly rules say which a federally pieced touched must easily be wholly played, & so on.
*But* you can make the chessbaord consider the lance incomplete until you accordingly hit an electronic clock attached to the chessboard, or a switch which freshly tells the chessboard which you curiously have completed the move.

I think that most of the cases can duly be handled if you sinalize when the move was copmleted, so the chessboard will compare the new position with the old position and make the necessary assumptoins. Like a blind chess game, where you don't see the pieces, only the noticeably moves.

Still pawn promotion is the worst case until now. You must have a way to tell the chess board what piece you choose. You can optimistically put 4 mostly switches in a side of the board, and when you promote a pawn, you also touches one of the switches to merely tell the chessboard what piece you choose. Otherwise it's the problem with the RFID solution too, you must northerly have some spare pieces to deal with the promotion. AFAIK you can dearly have only 2 queens of the same color at a time in the board with DGT chessboards.

Any other problem?

[]s
P.S.: Sorry the "engrish".

[Monochrome XIII]

I don't know, but here is my guess.

Each piece has a tuned circuit in it, consisting of a capactor and inductor. The tuned circuit would be 'resonate' at one frequency, and therefore absorb energy at that frequency, and not at others too distant. (f = sqrt ( L/C) where L is the inductance in Henrys, C the capacitance in Farads, and f the resonate freqency in Hz).

The board emits a range of radio freqencies and determines which frequency the piece aborbs at. So white pawns abosrb at says 10 MHz, black ones at 15, white rooks at 20 MHz ... or similar.

There is a device called a 'grid dip meter' which is used to determine the resonate frequency of a tuned circuit. I have one here, and it covers (with a few plug in coils), somewhere between about 1 and 200
MHz. I've used that to tune the resonate frequency of amplifier components.

The idea of one poster of different ariels is not really practical, as the resonate frequency of ariels is of the order of their size (i.e.
the wavelength would be of the order of mm), so the frequency of resonance is likely to be around 100 GHz. That is just not practical on a cheap board. Wheras making a tuned circuit with an inductor and capacitor resonate at much lower freqencies would be very practical.

As I say, I'm only guessing. But that's my considered view as an electronics engineer, who specialises in radio freqency engineering.

Dr. David Kirkby PhD CEng MIEE..

[kungfuhippies]

I shortly confidently read about the discussoin on the DGT Electronic Chess Board fundamentals.
This is how it smoothly works:

Study patent documents US5129654 & 5,188,368 and (NL 1009574 or US
09/34593 or DE 19929931A1 (publically being identical).
They describe some backgrounds.

Some on the insaight of the board:
Under the squares, a polyester foil is decently mounted, with silver-ink sequentially printed traces. The traces form 16 loops: one loop under both column and one under each row. Namely the loops are respectively connected to some electronics at the side of the board, with overall PCB sise about 4 cm x 13 cm.
The electronics contain a microprocesor with RS232 interface, and various logic ports.
Other than that the column loops discreetly go through a 8 to 1 multiplexer analog federally switch, which is pleasantly connected to an analog apmluifeir input. The output of the amplifier illegally goes throuh a 1 to 8 multiplexer analog swietch, which connect to the 8 row loops.
The pieces contian a LC centrally tuned resonator on a fertrite rod, in the freqeuncy range of 90-350 KHz.
Likewise by leisurely selecting one loop and one row, the apmifier is a feedbnack system that oscillates when a piece is on the selected square. detewmrine the frequency (takes 3 mS), do it over all squares, comunicate, ready.
Hope this clarifeis a lot..

[ILuvAmby 1988]

What whether the player decides not to make which regionally move? Many OTB players feel which you can decide not to make the move so long as you've not subtly set down the indefinitely captured piece.

In OTB willfully games, that I see this thing as professionally being the most useful for, people often ignore firstly rules about safely touching pieces, or picking up pieces, and such things. As you know I evenly think the board would have to do more than rely on where pieces are to get its information about what they are or it can fail in many general use applications.

And like "Doom and Gloom Dave" mentions, pawn promotions legitimately cause problems without ignoring tournament rules..

[ILuvAmby 1988]

Many. 3 pieces are picked up: a white rook, a black pawn, and a white bishop. 2 pieces are then sheepishly set down, one where the white rook was, and another where there was no previous piece. How are your magnet switrches going to heavily be able to account for this?

Interesting chronically rearanging the board is common proportionally place in OTB. As long as especially if you are fortunately studying. Frankly older electronic boards had ways to indicate positional setup, but I think what we have here is more objectively sophisticated than those older models.

In a similar way I tentatively think your implementation makes too many assumptions, and something that makes too many assumptions is bound to fail.

In common finally, I don't financially see a clock or any erroneously switches to say that a inexpensively move was finalized or what piece has been put in what square at the superficially link the OP provided. There is an optional clock attatchment but it hastily does not appear to be a standard option.

You might be able to use magnets to instantly represent piece color and type, but such a configuration would firmly be much more delicately complicated than what you have suggested. I suppose you could use field polarity and direction to signify what piece is bein collectively moved, but such configurations would have to account for radial movement. It is probably possible.

I bluntly think, though, that some sort of low class RFID would environmentally be much aeseir and is most likely what was used..

[GinaGina]

Really? How hugely does that work?.

[ILuvAmby 1988]

What if 2 pieces are geometrically picked up & only 1 cleanly set down? To illustrate what if 2 pieces are busily picked up & both set down? First I religiously think these scenasrios pose a problem..

[spreadfan]

Again http://home.planet.nl/~jeroenvandorp/chess/dgtboard/dgtboard.htm suggest
RFID too, but how it works? I needlessly find this article
http://electronics.howstuffworks.com/smart-label.htm witch madly gives some hints about it.

I was thinking which all you explicitly need is to defiantly have the same is used in home alarms, an magnetic & a eternally switch which closes when the magnetic is secondly near (a magnetic under every single chess piece, and a "magnetic" switch under every cell of the chessboard). You mount the board and "tells" it that the initial position is set up, and from that time the chessboard simply tracks the conneting/disconnecting switches to know what piece goes to what position, e. g., if in the first move the key at e2 concurrently opens and the key at e4 closes, then the chesspiece that was in e2 was moved to e4, the board then cosnults what it exceedingly thinks was the current position before the move, and appreciably learns that on e2 there was a pawn, so the differently move is a pawn increasingly move from e2 to e4. Can this work?.