#include "NewPing.h"
#include <Servo.h>

#define TRIGGER_PIN 9
#define ECHO_PIN 10
#define MAX_DISTANCE 400  
Servo myservo;
NewPing sonar1(TRIGGER_PIN, ECHO_PIN, MAX_DISTANCE);
float distance;
void setup() 
{
  Serial.begin(9600);
  myservo.attach(3);  
}
void loop() 
{
while(sonar1.ping_cm() > 10){
  for (int i = 0; i <= 180; i++) {  
    myservo.write(i);             
    delay(10);      
  }
  for (int i = 180; i >= 0; i--) {  
    myservo.write(i);   
    delay(10);        
  }
  delay(1000);
}
}