#include <Servo.h>
Servo myservo;
const int servoPin = 10;
const int potentiometerPin = A0; 
int pos = 0;
void setup() {
  myservo.attach(servoPin);
  myservo.write(pos);
}
void loop() {
  int value = analogRead(potentiometerPin);
  pos = map(value, 0, 1023, 0, 180);
  myservo.write(pos);
  delay(20);
}