#include <Servo.h>

Servo myservo;

int p = 0;
int v;

void setup() {
  // put your setup code here, to run once:
  myservo.attach(3);
}

void loop() {
  // put your main code here, to run repeatedly:
  v = analogRead(p);
  v = map(v, 0, 1023, 0, 180);
  myservo.write(v);
  delay(15);
}