#define JoyX A0

void setup() {
  Serial.begin(9600);
}

void loop() {
  if(analogRead(JoyX) < 525) {
    Serial.println(map(analogRead(JoyX),524,0,0,255));
  } else if(analogRead(JoyX) > 525) {
    Serial.println(map(analogRead(JoyX),526,1023,0,255));
  }delay(100);
}