#include <Servo.h>
#include <Ultrasonic.h>

#define trigPin 12 
#define echoPin 13

Ultrasonic us(12, 13);
int distance;

Servo myservo;  // create servo object to control a servo
// twelve servo objects can be created on most boards

int pos = 0;    // variable to store the servo position

void setup() {
  myservo.attach(9);  // attaches the servo on pin 9 to the servo object
  Serial.begin(9600);
}

void loop() {

distance = us.read(CM);
myservo.write(distance / 3);
Serial.print("The distance of ultrasonic:");
Serial.println(distance);
Serial.print("The angle of servo motor:");
Serial.println(distance/3);
delay(1000);

}