#include <Servo.h>
Servo servo1;
int trigPin = 6;
int echoPin = 5;
long distance;
long duration;

void setup()
{
servo1.attach(11);
pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);// put your setup code here, to run once:
}

void loop() {
ultra();
servo1.write(0);
if(distance <= 10){
servo1.write(90);
}
}

void ultra(){
digitalWrite(trigPin, LOW);
delayMicroseconds(2);
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);
duration = pulseIn(echoPin, HIGH);
distance = duration*0.034/2;
}