Arduino dice OLED

dice.ino

#include <Wire.h>

#include <Adafruit_GFX.h>

#include <Adafruit_SSD1306.h>

#define SCREEN_WIDTH 128

#define SCREEN_HEIGHT 32

#define OLED_RESET    -1

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

#define BUTTON_PIN 2

// Dice face patterns (5×5 grid) stored in PROGMEM

const uint8_t diceFaces[6][5][5] PROGMEM = {

  { {0,0,0,0,0},  // 1

    {0,0,0,0,0},

    {0,0,1,0,0},

    {0,0,0,0,0},

    {0,0,0,0,0} },

  { {1,0,0,0,0},  // 2

    {0,0,0,0,0},

    {0,0,0,0,0},

    {0,0,0,0,0},

    {0,0,0,0,1} },

  { {1,0,0,0,0},  // 3

    {0,0,0,0,0},

    {0,0,1,0,0},

    {0,0,0,0,0},

    {0,0,0,0,1} },

  { {1,0,0,0,1},  // 4

    {0,0,0,0,0},

    {0,0,0,0,0},

    {0,0,0,0,0},

    {1,0,0,0,1} },

  { {1,0,0,0,1},  // 5

    {0,0,0,0,0},

    {0,0,1,0,0},

    {0,0,0,0,0},

    {1,0,0,0,1} },

  { {1,0,0,0,1},  // 6

    {0,0,0,0,0},

    {1,0,0,0,1},

    {0,0,0,0,0},

    {1,0,0,0,1} }

};

void drawDiceFace(uint8_t value, int x, int y, int size) {

  // value: 1 to 6

  for (int row = 0; row < 5; row++) {

    for (int col = 0; col < 5; col++) {

      if (pgm_read_byte(&diceFaces[value - 1][row][col])) {

        display.fillCircle(x + col * size, y + row * size, size / 2, SSD1306_WHITE);

      }

    }

  }

}

void setup() {

  pinMode(BUTTON_PIN, INPUT_PULLUP);

  randomSeed(analogRead(A0)); // Seed for randomness

  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {

    for (;;); // Don't proceed if display init fails

  }

  display.clearDisplay();

  display.setTextColor(SSD1306_WHITE);

  display.setTextSize(1);

  display.setCursor(0, 0);

  display.println("Dice Roller Ready");

  display.display();

}

void loop() {

  static bool lastState = HIGH;

  bool currentState = digitalRead(BUTTON_PIN);

  if (lastState == HIGH && currentState == LOW) { // Button pressed

    int diceValue = random(1, 7); // Random number 1-6

    display.clearDisplay();

    display.setTextSize(1);

    display.setCursor(0, 0);

    display.print("You rolled: ");

    display.println(diceValue);

    drawDiceFace(diceValue, 90, 5, 4); // Draw dice at right side

    display.display();

  }

  lastState = currentState;

}