#include <Servo.h>
int BUTTON_PIN = 2;
int POTENTIOMETER_PIN = A0;

Servo servo;
int angle = 0; 

void setup(){
  pinMode(BUTTON_PIN, INPUT_PULLUP);
  servo.attach(9);
}
 void loop(){
  int potentiometerValue = analogRead(POTENTIOMETER_PIN);
  bool buttonState = digitalRead(BUTTON_PIN);

  angle = map(potentiometerValue, 0 ,1023,0 ,180);

  if(buttonState ==LOW) {
    servo.write(angle);
    delay(15); 
  }
 }