#include <Servo.h>


int servo = 3;
int potmeter = A5;  
float val = 0;

Servo myServo;

void setup() {
  Serial.begin(9600);
  pinMode(potmeter, INPUT);
  myServo.attach(servo);  // attaches the servo on pin 9 to the servo object
}

void loop() {
  val = analogRead(potmeter);            // reads the value of the potentiometer (value between 0 and 1023)
  float mapval = map(val, 0, 1023, 0, 180);     // scale it to use it with the servo (value between 0 and 180)
  myServo.write(mapval);                  // sets the servo position according to the scaled value
  // waits for the servo to get there
}