// 32x8 LED Matrix STOP Sign with Flashing Effect
// Uses 4x 8x8 LED Matrix (MAX7219) modules

#include <LedControl.h>

// Pin connections: DIN=12, CLK=11, CS=10, 4 modules
LedControl lc = LedControl(12, 11, 10, 4);

// Large STOP sign pattern (32x8 - octagon shape)
// Solid filled octagon
byte stopSign[8][4] = {
  {B00011111, B11111111, B11111111, B11111000},  // Row 0 - top
  {B01111111, B11111111, B11111111, B11111110},  // Row 1
  {B11111111, B11111111, B11111111, B11111111},  // Row 2
  {B11111111, B11111111, B11111111, B11111111},  // Row 3
  {B11111111, B11111111, B11111111, B11111111},  // Row 4
  {B11111111, B11111111, B11111111, B11111111},  // Row 5
  {B01111111, B11111111, B11111111, B11111110},  // Row 6
  {B00011111, B11111111, B11111111, B11111000}   // Row 7 - bottom
};

// STOP text pattern - simplified and readable
// Using block letters: S T O P
byte stopText[8][4] = {
  {B00011111, B11111111, B11111111, B11111000},  // Row 0
  {B01111111, B11111111, B11111111, B11111110},  // Row 1
  {B11110111, B01110111, B01110111, B01111111},  // Row 2 -  S   T   O   P
  {B11110101, B01010101, B01010101, B01111111},  // Row 3 -  S   T   O   P
  {B11110111, B01010101, B01010111, B01111111},  // Row 4 -  S   T   O   P
  {B11110001, B01010101, B01010101, B01111111},  // Row 5 -  S   T   O   P
  {B01111111, B11111111, B11111111, B11111110},  // Row 6
  {B00011111, B11111111, B11111111, B11111000}   // Row 7
};

// Octagon outline only
byte stopOutline[8][4] = {
  {B00011111, B11111111, B11111111, B11111000},  // Row 0
  {B01111111, B00000000, B00000000, B11111110},  // Row 1
  {B11100000, B00000000, B00000000, B00000111},  // Row 2
  {B11000000, B00000000, B00000000, B00000011},  // Row 3
  {B11000000, B00000000, B00000000, B00000011},  // Row 4
  {B11100000, B00000000, B00000000, B00000111},  // Row 5
  {B01111111, B00000000, B00000000, B11111110},  // Row 6
  {B00011111, B11111111, B11111111, B11111000}   // Row 7
};

void setup() {
  // Initialize all 4 matrix modules
  for (int i = 0; i < 4; i++) {
    lc.shutdown(i, false);      // Wake up display
    lc.setIntensity(i, 8);      // Set brightness (0-15)
    lc.clearDisplay(i);         // Clear display
  }
}

void displayPattern(byte pattern[8][4]) {
  // Display pattern across 4 modules (32 columns total)
  // Module indexing: 3=leftmost, 2, 1, 0=rightmost (reverse order in chain)
  for (int row = 0; row < 8; row++) {
    // Module 3 (leftmost) - bits 31-24
    lc.setRow(3, row, pattern[row][0]);
    // Module 2 - bits 23-16
    lc.setRow(2, row, pattern[row][1]);
    // Module 1 - bits 15-8
    lc.setRow(1, row, pattern[row][2]);
    // Module 0 (rightmost) - bits 7-0
    lc.setRow(0, row, pattern[row][3]);
  }
}

void clearAll() {
  for (int i = 0; i < 4; i++) {
    lc.clearDisplay(i);
  }
}

void loop() {
  // Show filled octagon STOP sign
  displayPattern(stopSign);
  delay(600);
  
  // Show STOP text
  displayPattern(stopText);
  delay(600);
  
  // Show outline only
  displayPattern(stopOutline);
  delay(600);
  
  // Flash effect - all off
  clearAll();
  delay(400);
  
  // Show filled again
  displayPattern(stopSign);
  delay(600);
  
  // Show text again
  displayPattern(stopText);
  delay(600);
  
  // All off
  clearAll();
  delay(400);
}