#include <Servo.h>
Servo myServando;
const int trigPin=9;
const int echoPin=10;
const int servoPin=3;
long duration;
int distance;
void setup() {
  pinMode(trigPin,OUTPUT);
  pinMode(echoPin,INPUT);
  myServando.attach(servoPin);
  Serial.begin(9600);

}

void loop() {
 ultra();
 myServando.write(0);
 if(distance < 15 && distance >5){
 myServando.write(90);
 }
 else if(distance <30 && distance >16){
  myServando.write(180);
 }
}

void ultra(){

  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distance= duration*0.034/2;
  Serial.print("Distance: ");
  Serial.println(distance);
}