/*
 Controlling a servo position using a potentiometer (variable resistor)
 by Michal Rinott <http://people.interaction-ivrea.it/m.rinott>

 modified on 8 Nov 2013
 by Scott Fitzgerald
 http://www.arduino.cc/en/Tutorial/Knob
*/

#include <Servo.h>

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

int potpin = 0;  // analog pin used to connect the potentiometer
int val;    // variable to read the value from the analog pin

void setup() {
  myservo.attach(9);  // attaches the servo on pin 9 to the servo object
    Serial.begin(9600);
  Serial.setTimeout(50);
  Serial.println("start");
}

void loop() {
  val = analogRead(potpin);            // reads the value of the potentiometer (value between 0 and 1023)
  val = map(val, 0, 1023, 0, 180);     // scale it to use it with the servo (value between 0 and 180)
  //myservo.write(val);                  // sets the servo position according to the scaled value


   if (Serial.available()) {
    String str = Serial.readString();
    int x;
    Serial.println(str);
       
    switch (str[0]) {
    case 'x':
     { Serial.println("xxx");
     str.remove(0,2);
     Serial.println(str);
     x=str.toInt();
     Serial.println(x);
     myservo.write(x);
     }
      break;
    case 2:
      //выполняется когда  var равно 2
      break;
    default:
      // выполняется, если не выбрана ни одна альтернатива
      // default необязателен
  break;
  
  }




  }


  delay(150);                           // waits for the servo to get there
}