For 28 piece domino game set we wish to develop led application. On each piece teher would be four color options (red, green, orange, blue). Each player picks and starts with seven pieces. Somehow [and that is your design task] each player activates switch to turn on his designated color on all 7 pieces. Thus, all 4 players in the game will have a distinct color on their pieces.
Instead of having to keep track and remember when who played which piece, by the color of the piece (separate for each player) the players can quickly knows what was played and make a better decision of what piece to play next and what strategy to follow in the game.
Domino is our national past time and it is a poor man's game. Thus the product has to be reasonably low priced. If you enter Google and search Domino you will get a clear idea of the game pieces.
Comment if you can make such product and provide tentative cost idea.