/**********************************************
  *              joystick         ardunio uno
  *              Gnd----------------GND           
  *              +5V----------------5V
  *              VRx----------------A0
  *              VRy----------------A1
  *              SW-----------------D3
  *              
  *********************************************/
#define BUAD_RATE  9600
const int SW=3;
int FirstShotX , FirstShotY;
void setup() {
  pinMode(SW, INPUT);
  Serial.begin(BUAD_RATE);
  FirstShotX = 0;
  FirstShotY = 0;
}

void loop() {
  
 int z=digitalRead(SW);
 if(z==0)
 Serial.println("--------->Z");
  int sensorValue = analogRead(A0);
  if(FirstShotX == 0)
  {
    FirstShotX = sensorValue;
    Serial.print("FirstShotX = ");
    Serial.println(FirstShotX);
  }
  Serial.print("X = ");
  Serial.println(sensorValue - FirstShotX);
  sensorValue = analogRead(A1);
  if(FirstShotY == 0)
   {
      FirstShotY = sensorValue;
      Serial.print("FirstShotY = ");
      Serial.println(FirstShotY);
    }
  Serial.print("Y = ");
  Serial.println(sensorValue - FirstShotY);
  delay(200);
}