#include <Servo.h>



Servo servo;  // 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
int targetPos = 0;
String str = "";

void setup() {
  // put your setup code here, to run once:
  
  Serial.begin(9600);
/* attaches the servo on pin 9 
   to the servo object */
  servo.attach(9);  
  Serial.write("Ready!\n");
}


void loop() {
  // put your main code here, to run repeatedly:

  if(Serial.available()) {
    targetPos = Serial.parseInt();
    Serial.flush();
    Serial.print("new target pos: " );
    Serial.print(targetPos);
    Serial.write("\n");
  }

  // for (pos = 0; pos <= 180; pos += 1) { // goes from 0 degrees to 180 degrees
  //   // in steps of 1 degree
  //   servo.write(pos);              // tell servo to go to position in variable 'pos'
  //   delay(15);                       // waits 15ms for the servo to reach the position
  // }
  // for (pos = 180; pos >= 0; pos -= 1) { // goes from 180 degrees to 0 degrees
  //   servo.write(pos);              // tell servo to go to position in variable 'pos'
  //   delay(15);                       // waits 15ms for the servo to reach the position
  // }

  if(pos < targetPos) {
    ++pos;
    servo.write(pos);
    Serial.print(pos);
    Serial.write("\n");


  }
  else if(pos > targetPos) {
    --pos;
    servo.write(pos);
    Serial.print(pos);
    Serial.write("\n");
  }
  servo.write(pos);
  delay(150);
}