16x2 LCD Space Shooter game!

#include <LiquidCrystal.h>



// Matches your Pin Setup: RS, EN, D4, D5, D6, D7
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

// Pins (Adjusted to match your Pong button pins)
const int btnMove = 8;   // Button to switch rows
const int btnShoot = 7;  // Button to fire
const int buzzer = 10;   // Optional: Connect to Pin 10 and GND

// Player Variables
int playerRow = 0;

// Bullet Variables
int bulletCol = -1; 
int bulletRow = -1;

// Enemy Variables
int enemyCol = 15;
int enemyRow = 0;

// Game State
int score = 0;
int wave = 1;
int enemiesInWave = 0;
int gameSpeed = 350; // Milliseconds between enemy moves
unsigned long lastMoveTime = 0;

void setup() {
  lcd.begin(16, 2);
 
  
  pinMode(btnMove, INPUT_PULLUP);
  pinMode(btnShoot, INPUT_PULLUP);
  pinMode(buzzer, OUTPUT);

  lcd.clear();
  lcd.print("SPACE SHOOTER");
  lcd.setCursor(0, 1);
  lcd.print("GET READY!");
  delay(2000);
}

void loop() {
  // 1. INPUT: Move Player (Toggle between Row 0 and Row 1)
  if (digitalRead(btnMove) == LOW) {
    playerRow = !playerRow; 
    delay(200); // Simple debounce
  }

  // 2. INPUT: Shoot Bullet
  if (digitalRead(btnShoot) == LOW && bulletCol == -1) {
    bulletCol = 1; // Start right in front of ship
    bulletRow = playerRow;
    tone(buzzer, 1000, 50); // Short beep
  }

  // 3. LOGIC: Move Bullet
  if (bulletCol != -1) {
    bulletCol++;
    if (bulletCol > 15) bulletCol = -1; // Remove if off-screen
  }

  // 4. LOGIC: Move Enemy based on gameSpeed
  if (millis() - lastMoveTime > gameSpeed) {
    enemyCol--;
    lastMoveTime = millis();

    // Check if Enemy hit the player
    if (enemyCol == 0 && enemyRow == playerRow) {
      gameOver();
    }

    // If enemy escapes to the left
    if (enemyCol < -1) { 
      gameOver();
    }
  }

  // 5. LOGIC: Collision Detection (Bullet hits Enemy)
  // We check if bullet is at enemyCol or enemyCol + 1 because enemy is "<}"
  if (bulletRow == enemyRow && (bulletCol == enemyCol || bulletCol == enemyCol + 1)) {
    bulletCol = -1; // Remove bullet
    score++;
    enemiesInWave++;
    tone(buzzer, 500, 50);
    spawnEnemy();

    // Wave Progression Logic (10 enemies per wave)
    if (enemiesInWave >= 10) {
      nextWave();
    }
  }

  drawGame();
  delay(50); // Small delay for stability
}

void drawGame() {
  lcd.clear();
  
  // Draw Player Ship
  lcd.setCursor(0, playerRow);
  lcd.print(">");

  // Draw Bullet
  if (bulletCol != -1) {
    lcd.setCursor(bulletCol, bulletRow);
    lcd.print("-");
  }

  // Draw Enemy (The <} character)
  if (enemyCol >= 0 && enemyCol <= 15) {
    lcd.setCursor(enemyCol, enemyRow);
    lcd.print("<}");
  }
}

void spawnEnemy() {
  enemyCol = 15;
  enemyRow = random(0, 2);
}

void nextWave() {
  wave++;
  enemiesInWave = 0;
  gameSpeed = gameSpeed - 50; // Make it faster
  if (gameSpeed < 100) gameSpeed = 100; // Speed cap

  if (wave > 6) {
    victory();
  } else {
    lcd.clear();
    lcd.setCursor(4, 0);
    lcd.print("WAVE ");
    lcd.print(wave);
    delay(1500);
  }
}

void gameOver() {
  lcd.clear();
  lcd.print("GAME OVER!");
  lcd.setCursor(0, 1);
  lcd.print("Score: ");
  lcd.print(score);
  tone(buzzer, 150, 1000);
  while(1); // Stop the game
}

void victory() {
  lcd.clear();
  lcd.print("VICTORY!");
  lcd.setCursor(0, 1);
  lcd.print("GALAXY SAVED!");
  while(1);
}