int xPin = A0;
int yPin = A1;
int buttonPin = 2;

int xVal;
int yVal;
int buttonState;

int upLed = 10;
int downLed = 9;
int leftLed = 11;
int rightLed = 5;
int upBrightness = 0;
int downBrightness = 0;
int leftBrightness = 0;
int rightBrightness = 0;

void setup() {
  // put your setup code here, to run once:
  Serial.begin (9600);
  pinMode (xPin, INPUT);
  pinMode (yPin, INPUT);
  pinMode (buttonPin, INPUT_PULLUP);
  pinMode (upLed, OUTPUT);
  pinMode (downLed, OUTPUT);
  pinMode (leftLed, OUTPUT);
  pinMode (rightLed, OUTPUT);
  
}

void loop() {
  // put your main code here, to run repeatedly:
  xVal = analogRead (xPin);
  Serial.print ("xVal = ");
  Serial.println (xVal);
  yVal = analogRead (yPin);
  Serial.print ("yVal = ");
  Serial.println (yVal);
  buttonState = digitalRead (buttonPin);

  upBrightness = map(yVal, 513, 1023, 0, 255);
  downBrightness = map(yVal, 511, 0, 0, 255);
  leftBrightness = map(xVal, 513, 1023, 0,255);
  rightBrightness = map(xVal, 511, 0, 0, 255);

  if (yVal >= 513){
    analogWrite(upLed, upBrightness);
  }

  if (yVal <= 511){
    analogWrite(downLed, downBrightness);
  }

  if (xVal >= 513){
    analogWrite(leftLed, leftBrightness);
  }

  if (xVal <= 511){
    analogWrite(rightLed, rightBrightness);
  }

  if (buttonState == LOW){
    digitalWrite (upLed, HIGH);
    digitalWrite (downLed, HIGH);
    digitalWrite (leftLed, HIGH);
    digitalWrite (rightLed, HIGH);
  }

  if (buttonState == HIGH){
    digitalWrite (upLed, LOW);
    digitalWrite (downLed, LOW);
    digitalWrite (leftLed, LOW);
    digitalWrite (rightLed, LOW);
  }

}