using arduino, LTC 4625G, 3 buttons and 2 4051 multiplexers
i will add the scematic for the board later it has a few modes 0 - sector check 1 - 2 score keepers (0 -99) 2 - stopwatch 3 - a randomly generated card from a deck of poker (plays all 52 cards before reset) 4 - just randomness 5 - a randomly generated card from a deck of spanish cards (plays all 40 cards before reset) 6 - chess timer setup 7 - chess timer
digit display: pdf datasheet. https://optoelectronics.liteon.com/upload/download/DS-30-95-241/LTC-4625G.pdf