Mastermind

This is based on the board game of the same name, but this is singleplayer. When you start a new game, a random number between 1-8 is generated for each digit and the board is cleared. The RNG I used is 3-bit binary converted to analog and incremented by 1 to get the number between 1-8. The user inputs are immediately sent to the board and to the logic unit beneath. The logic unit compares the generated code to the user's guess. It does this by comparing every digit in the code to the guess, which is easiest using a grid-like architecture where the columns and rows are from the 2 codes. I'm using analog "comparators" at each intersection in the grid. The logic unit only allows 1 match per row and per column, which allows for duplicate colors in the code. It does this by effectively disabling the other possible matches except for where a correct placement could occur. Once it's done matching, the LU adds the number of correct placements and misplacements (again in analog) and sends that data to the board. The signal strength of that data ranges from 1-5 so as to display the proper information on the board.

The board only allows the user inputs and data from the LU to be saved to 1 row at a time. This is done through rising-edge monostables that give 2-tick off pulses that allow the information to pass into the memory cells. It knows which row to save to through an analog counter that loses 1 signal strength per row. The counter is incremented each time the user hits the "Set as Guess" button and is displayed on a 7 segment display on the board.

Once the code is randomly generated, it is immediately sent to the displays at the top of the board but isn't allowed through until the user wins or until they run out of guesses. The game keeps track of the guesses through the analog counter mentioned above. When that counter reached 10, the correct code will be displayed. The win detect is handled by the correct placement memory cells on the board. If any are equal to 5 then the user has won. Once either the player has won or run out of guesses, the signal from the "Set as Guess" button is disabled by disabling a comparator.

I haven't gone over the selector panels or displays, but I hope those are self-explanatory.