#include <Servo.h> // servo library

Servo practical; // define servo object
int value; // define variable to read value from analog pin

void setup() {
  // put your setup code here, to run once:
  practical.attach(5); // connect servo object to servo
}

void loop() {
  // put your main code here, to run repeatedly:
  value = analogRead(A0); // get potentiometer value 0 - 1023
  value = map(value, 0, 1023, 0, 180); // scale down value to rotate servo from 0 to 180
  practical.write(value); // update servo position to scaled down value
  delay(15); // wait 15 miliseconds for servo to reach the position
}