int ultrasonicsignal = 13;
int light = 11;

int distancelevelone = 20;
int distanceleveltwo = 40;
int distancelevelthree = 60;
int distancelevelfour = 80;
int distancelevelfive = 100;

int procent20 = 204;
int procent40 = 153;
int procent60 = 102;
int procent80 = 51;
int procent100 = 0;

float pingTime;
float distance;

void setup() {
  Serial.begin(9600);
  pinMode(ultrasonicsignal, OUTPUT);
}

void loop() {
  pinMode(ultrasonicsignal, OUTPUT);
  digitalWrite(ultrasonicsignal, LOW);
  delayMicroseconds(5);
  digitalWrite(ultrasonicsignal, HIGH);
  delayMicroseconds(5);
  digitalWrite(ultrasonicsignal, LOW);

  pinMode(ultrasonicsignal, INPUT);
  pingTime = pulseIn(ultrasonicsignal, HIGH);

  distance = pingTime/29,41176470588235/2;

  if (distance <= distancelevelone){ // Full styrka
    analogWrite(light, procent100);
  }
  else if (distance <= distancelevelone && distance > distanceleveltwo){
   analogWrite(light, procent80);
  }
  else if (distance > distanceleveltwo && distance < distancelevelthree){
  analogWrite(light, procent60);
  }
  else if (distance > distancelevelthree && distance < distancelevelfour){
  analogWrite(light, procent40);
  }
  else if (distance > distancelevelfour && distance < distancelevelfive){
  analogWrite(light, procent20);
  }
  Serial.println("Avstandet ar: ");
  Serial.print(distance);
  Serial.println(" centimeter");
  delay(1000);
}