Scottish Terrier companion bot

#include <Servo.h>

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

int pos = 75;    // initial servo position in degrees
int rand_sleep_ms = 500; // sleep duration between two head turns
int rand_destination = 75; // destination servo position in degrees
int dir = 0; // direction left(0) or right(1)
  
void setup() {
  myservo.attach(9);  // attaches the servo on pin 9 to the servo object
}

void loop() {
  // Define the movement
  rand_sleep_ms = random(500, 4000);

  dir = ~dir;
  
  if(dir == 0){
    rand_destination = random(50, 75);
  }
  else{
    rand_destination = random(75, 100);
  }
 

  // Execute the movement
  if(pos<rand_destination){
    for (pos = pos; pos <= rand_destination; pos += 1) { // head turn to the right
      // in steps of 1 degree
      myservo.write(pos);              // tell servo to go to position in variable 'pos'
      delay(15);                       // waits 15 ms for the servo to reach the position
    }
  }
  else{
    for (pos = pos; pos >= rand_destination; pos -= 1) { // head turn to the left
      // in steps of 1 degree
      myservo.write(pos);              // tell servo to go to position in variable 'pos'
      delay(15);                       // waits 15 ms for the servo to reach the position
    }
  }

  delay(rand_sleep_ms);
}