This project is based on the Master Mind game. The program allows Arduino to guess the secret code chosen by you. At each attempt, you will need to use buttons 1, 2, 3 to enter the key code. At each attempt, the algorithm finds all candidate codes as possible secret codes and plays one of them at random. The game ends when the entered key code confirms that the secret code has been guessed or if the played code is the only one that can be the secret code.

For game instructions and other game implementations visit: mastermind.altervista.org

Logic Deduction Algorithms: Arduino Mastermind

Most Arduino games rely on physical reflexes (like dodging a pixel on an OLED). The Arduino Mastermind heavily pivots into core computer science. It forces the programmer to generate random cryptographic arrays, accept complex multidimensional user inputs, and mathematically score "Color and Position" logic to recreate the famous 1970s code-breaking board game.

Generating the Cryptographic Array

The game begins with the Arduino acting as the "Codemaker."

1. You utilize randomSeed(analogRead(0)) to pull raw electronic noise from the universe. If you skip this, the Arduino will generate the exact same "random" code every time you turn it on!
2. random(1, 7) generates 4 numbers (e.g., 4, 1, 6, 2 representing Green, Red, Blue, Yellow).
3. The Arduino locks this massive integer matrix away in its memory: int secretCode[4];.

The Dual-Feedback Scoring Logic

The player utilizes potentiometers or push-buttons to guess a 4-color combination (e.g., 1, 1, 1, 1 = Red, Red, Red, Red).

• The hardest part of the C++ code is the mathematical scoring engine.
• A Red Pin means: User guessed the right color in the exact right spot.
• A White Pin means: User guessed the right color, but in the wrong spot.
• The Execution: The Arduino utilizes terrifying nested for loops.

for(int i=0; i<4; i++) {
  if (guess[i] == secretCode[i]) {
    redPins++;
    flagged[i] = true; // Prevents counting the same color twice!
  }
}

• It computes the math and illuminates RGB LEDs or outputs directly to a shiny LCD 16x2 Display: Red: 1, White: 2. Guesses remaining: 6!

Game Architecture

• Arduino Uno/Mega.
• 16x2 I2C LCD Screen (Absolutely critical for printing the massive array of past guesses and scores, exactly like the physical board game).
• 4x Potentiometers or 4x Push-Buttons to act as the massive, physical combination lock the user spins to guess colors!
• RGB LEDs or standard NeoPixels to visually represent the player's current combination guess.