#include <Servo.h>

const int trigPin = 11;
const int echoPin = 10;

long duration;
int distance;

Servo servo;

void setup() {
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  Serial.begin(9600);
  servo.attach(13);
}

void loop() {
  for (int i = 15; i <= 165; i++) {
    servo.write(i);
    delay(30);
    distance = calcdistance();
    Serial.print(i);
    Serial.print(",");
    Serial.print(distance);
    Serial.print(".");
  }
  for (int i = 165; i > 15; i--) {
    servo.write(i);
    delay(30);
    distance = calcdistance();
    Serial.print(i);
    Serial.print(",");
    Serial.print(distance);
    Serial.print(".");
  }
}

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