LCD Pong Game

#include <Wire.h>

#include <LiquidCrystal_I2C.h>

// Set the LCD address to 0x27 for a 16 chars and 2 line display

LiquidCrystal_I2C lcd(0x27, 16, 2);

int ballX = 7, ballY = 0;

int ballDirX = 1, ballDirY = 1;

int paddle1Pos, paddle2Pos;

void setup() {

 lcd.begin(); // Use lcd.init() for newer I2C libraries

 lcd.backlight();

 pinMode(A0, INPUT);

 pinMode(A1, INPUT);

 pinMode(7, OUTPUT);

 pinMode(8,OUTPUT);

 digitalWrite(7, HIGH);

 digitalWrite(8,HIGH);

}

void loop() {

 // 1. Read Potentiometers for both players

 // Map 0-1023 to 0-1 (the two rows of the LCD)

 paddle1Pos = map(analogRead(A0), 0, 1023, 0, 1);

 paddle2Pos = map(analogRead(A1), 0, 1023, 0, 1);

  // 2. Move Ball

 ballX += ballDirX;

 ballY += ballDirY;

 // 3. Wall Collisions (Top and Bottom)

 if (ballY <= 0 || ballY >= 1) {

   ballDirY = -ballDirY;

 }

 // 4. Paddle Collisions (Left and Right)

  // Player 1 (Left side - Column 0)

 if (ballX == 0) {

   if (ballY == paddle1Pos) {

     ballDirX = -ballDirX; // Bounce!

   } else {

     resetGame(); // Missed!

   }

 }

 // Player 2 (Right side - Column 15)

 if (ballX == 15) {

   if (ballY == paddle2Pos) {

     ballDirX = -ballDirX; // Bounce!

   } else {

     resetGame(); // Missed!

   }

 }

 // 5. Render

 lcd.clear();

  // Draw Paddle 1

 lcd.setCursor(0, paddle1Pos);

 lcd.print("|");

  // Draw Paddle 2

 lcd.setCursor(15, paddle2Pos);

 lcd.print("|");

  // Draw Ball

 lcd.setCursor(ballX, ballY);

 lcd.print("o");

  delay(200); // Game speed (lower is faster)

}

void resetGame() {

 ballX = 7;

 ballY = 0;

 ballDirX = -ballDirX; // Send it to the person who just scored

 lcd.clear();

 lcd.setCursor(5, 0);

 lcd.print("OUT!");

 delay(1000);

}