#include <Servo.h>.

const int trigPin = 10;
const int echoPin = 11;

long duration;
int distance;
long filterdistance[4];
Servo myServo;
long filter;
int a=0;

void setup() {
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  Serial.begin(9600);
  myServo.attach(12);
}
void loop() {
    distance = calculateDistance();
    myServo.write(i);

  while(a=0){

    if(distance<100){
  myServo.write(distance);
  delay(30);
  distance = calculateDistance();
    }

    else{
        myServo.write(100);

                distance = calculateDistance();
    }
  }

}

int calculateDistance(){

    for(int i=0;i<5;i++){

  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  // Sets the trigPin on HIGH state for 10 micro seconds
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH); // Reads the echoPin, returns the sound wave travel time in microseconds
  filterdistance[i]= duration*0.034/2;
  filter=filter+filterdistance[i];

  }
  distance=filter/5;

  return distance;
}