#include <Servo.h>
Servo servo;
const int trigPin = 10;
const int echoPin = 9;
long duration;
int distance;

void setup() {
  servo.attach(5);
  servo.write(0);
pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output
pinMode(echoPin, INPUT); // Sets the echoPin as an Input
Serial.begin(9600); // Starts the serial communication
}
void loop() {
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);
delay(10);

{  if(distance>10&&distance<20)
    servo.write(90); 
    delay(3000);
    servo.write(0);
  }
 { if(distance>0&&distance<10)
    servo.write(180);
    delay(3000);
    servo.write(0); 
  }
}