void setup() {
  // put your setup code here, to run once:
  pinMode(A0, INPUT);
  Serial.begin(115200);
}

void loop() {
  // put your main code here, to run repeatedly:
  static byte newPWM, normalPWM = 200;
  static byte remainingPWM = 255 - normalPWM;
  static int addedPWM, lastDistance, distance;
  static int maxDistance = 80, minDistance = 10;

  distance = map(analogRead(A0), 800, 0, maxDistance, minDistance);

  if (lastDistance != distance) {
    lastDistance = distance;
    
    //makes sure that we dont exceed limits
    if(distance <= maxDistance && distance >= minDistance) {
      addedPWM = map(distance, maxDistance, minDistance, 0, remainingPWM);
      newPWM = normalPWM + addedPWM;
      
      Serial.print("Distance: ");
      Serial.println(distance);
      Serial.print("PWM Val: ");
      Serial.println(newPWM);
    }
  }
}