This Instructable will teach you how to make a Pong game controlled by an arduino controller

Step 1: Arduino Code

Serial Call and Response Language: Wiring/Arduino This program sends an ASCII A (byte of value 65) on startup and repeats that until it gets some data in. Then it waits for a byte in the serial port, and sends three sensor values whenever it gets a byte in. Thanks to Greg Shakar and Scott Fitzgerald for the improvements The circuit: * potentiometers attached to analog inputs 0 and 1 * pushbutton attached to digital I/O 2 Created 26 Sept. 2005 by Tom Igoe modified 24 April 2012 by Tom Igoe and Scott Fitzgerald This example code is in the public domain. http://www.arduino.cc/en/Tutorial/SerialCallRespo... */

int firstSensor = 0; // first analog sensor

int secondSensor = 1; // second analog sensor

int thirdSensor = 0; // digital sensor

int inByte = 0; // incoming serial byte

char letter = Serial.read();

void setup()
{

// start serial port at 9600 bps:

Serial.begin(9600);

while (!Serial) {

; // wait for serial port to connect. Needed for Leonardo only
}

pinMode(2, INPUT); // digital sensor is on digital pin 2
establishContact(); // send a byte to establish contact until receiver

// responds

}

void loop()
{

// if we get a valid byte, read analog ins:

if (Serial.available() > 0) {
// get incoming byte:

inByte = Serial.read();
// read first analog input, divide by 4 to make the range 0-255:

firstSensor = analogRead(A0)/4;

// delay 10ms to let the ADC recover:
delay(10);

// read second analog input, divide by 4 to make the range 0-255:
secondSensor = analogRead(1)/4;

// read switch, map it to 0 or 255L
thirdSensor = map(digitalRead(2), 0, 1, 0, 255);

// send sensor values:
Serial.write(firstSensor);

Serial.write(secondSensor);
Serial.write(thirdSensor);

while (Serial.available() > 0) {
Serial.read(); //now do something with this byte

}

}
} void establishContact()

{ while (Serial.available() <= 0) { Serial.print('A');

// send a capital A delay(300);

}
}

Step 2: Processing Pong Code

// This example code is in the public domain.

import processing.serial.*; int bgcolor; // Background color int fgcolor; // Fill color Serial myPort; // The serial port int[] serialInArray = new int[3]; // Where we'll put what we receive int serialCount = 0; // A count of how many bytes we receive int xpos, ypos; // Starting position of the ball boolean firstContact = false; // Whether we've heard from the // microcontroller boolean gameStart = false; boolean hit = false; float x = 500; float y = 260; float speedX = random(3, 5); float speedY = random(3, 5); int leftColor = 128; int rightColor = 128; int diam; int rectSize = 50; float diamHit; int score1 = 0; int score2 = 0; int sound = 0; void setup() { myPort = new Serial(this, Serial.list()[0], 9600); size(1000, 520); // Stage size noStroke(); // No border on the next thing drawn // Set the starting position of the ball (middle of the stage) xpos = width/2; ypos = height/2; // Print a list of the serial ports, for debugging purposes: println(Serial.list()); // I know that the first port in the serial list on my mac // is always my FTDI adaptor, so I open Serial.list()[0]. // On Windows machines, this generally opens COM1. // Open whatever port is the one you're using. String portName = Serial.list()[0];

noStroke(); smooth(); ellipseMode(CENTER); } void draw() { background(0); rect (width-20, xpos-rectSize/2, 5, rectSize); rect (20, ypos-rectSize/2, 5, rectSize); textSize(20); text("Player1: "+score1,width/4,30); text("Player2: "+score2,width/1.5,30); fill(255); diam = 10; ellipse(x, y, diam, diam); if((x > width-21 && x < width -15 && y < xpos+rectSize/2 && y > xpos-rectSize/2) ||((x < 21 && x > 15 && y > ypos-rectSize/2 && y < ypos+rectSize/2) ) ) { hit = true; } else {

hit = false; }

if (gameStart) {

x = x + speedX; y = y + speedY;

// if ball hits movable bar, invert X direction and apply effects if((x > width-21 && x < width -15 && y < xpos+rectSize/2 && y > xpos-rectSize/2) ||((x < 21 && x > 15 && y > ypos-rectSize/2 && y < ypos+rectSize/2) ) ) { speedX = speedX * -1; x = x + speedX; rightColor = 0; fill(random(0,128),random(0,128),random(0,128)); diamHit = random(75,150); ellipse(x,y,diamHit,diamHit); } // resets things if you lose if (x > width) { gameStart = false; score1++; x = width/2; y = height/2; speedX = random(3, 5); speedY = random(3, 5); rectSize = 50; } if (x <0) { gameStart = false; score2++; x = width/2; y = height/2; speedX = random(3, 5); speedY = random(3, 5); rectSize = 50; }

// if ball hits up or down, change direction of Y if ( y > height || y < 0 ) { speedY = speedY * -1; y = y + speedY; } if (score1==3 || score2==3){ score1=0; score2=0; }

} } void mousePressed() { gameStart = !gameStart; }

void serialEvent(Serial myPort) { // read a byte from the serial port: int inByte = myPort.read(); // if this is the first byte received, and it's an A, // clear the serial buffer and note that you've // had first contact from the microcontroller. // Otherwise, add the incoming byte to the array: if (firstContact == false) { if (inByte == 'A') { myPort.clear(); // clear the serial port buffer firstContact = true; // you've had first contact from the microcontroller myPort.write('A'); // ask for more } } else { // Add the latest byte from the serial port to array: serialInArray[serialCount] = inByte; serialCount++; // If we have 3 bytes: if (serialCount > 2 ) { xpos = serialInArray[0]*2; ypos = serialInArray[1]*2; println(xpos + "t" + ypos + "t" + hit); // Send a capital A to request new sensor readings: if (hit = true){ myPort.write('B');

} else{ myPort.clear(); myPort.write('A'); } // Reset serialCount: serialCount = 0;

} } }