/*******************************************************************************
  Nintendo DS touchscreen module test program
      It reads the touchscreen via the analog I/O and broadcasts the reading
      over the serial connection. If the screen is touched, an LED will light.

  Hardware:
  Nintendo DS touchscreen module setup as follows:

     Analog pins
      | |
      Y X
      | |
  5v  | |  GND
   \  | |  /
  +---------+
  | I I I I |  <---Nintendo DS touchscreen ribbon cable (connector side up)
  | I I I I |
  | | | | | |

*******************************************************************************/

int X_PIN = 6;  //This analog pin reads the X direction
int Y_PIN = 7;  //This analog pin reads the Y direction
int LEDpin = 15;  //A PWM port for our LED

int currentX = 0;
int currentY = 0;

void setup(){
  Serial.begin(9600);  //Set serial to 9600 bps
}

void loop(){
  currentX = (1023-analogRead(X_PIN));  //This flips the X direction
  currentY = analogRead(Y_PIN);
  Serial.print("X = ");
  Serial.print(currentX);
  Serial.print(" Y = ");
  Serial.println(currentY);

  //Let's make the LED blink when we press the pad...
  if(currentX > 0 && currentY > 0)  //If it's touched...
    analogWrite(LEDpin, 255);
  if(currentX < 3 && currentY < 3)  //If it's released...
    analogWrite(LEDpin, 0);
}