#include <Servo.h>
const int trigPin = 12;
const int echoPin = 14;

Servo myservo;  // create servo object to control a servo

//define sound velocity in cm/uS
#define SOUND_VELOCITY 0.034

long duration;
float distanceCm;

void setup() {
  Serial.begin(115200); // Starts the serial communication
  pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output
  pinMode(echoPin, INPUT); // Sets the echoPin as an Input

  myservo.attach(2);  // attaches the servo on GIO2 to the servo object
}

void loop() {
  getdistance();
  if (distanceCm < 10){
    rotateServo(100);
  }
  else{
    rotateServo(10);
  }
  delay(100);
}


void getdistance() {
  // Clears the trigPin
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  // Sets the trigPin on HIGH state for 10 micro seconds
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  
  // Reads the echoPin, returns the sound wave travel time in microseconds
  duration = pulseIn(echoPin, HIGH);
  
  // Calculate the distance
  distanceCm = duration * SOUND_VELOCITY/2;
  
  
  // Prints the distance on the Serial Monitor
  Serial.print("Distance (cm): ");
  Serial.println(distanceCm);
 
  
  delay(100);
}


void rotateServo(int pos){
  myservo.write(pos);
  delay(1000);
}