#include <ESP32Servo.h>

Servo myservo; 

int potpin = 0;  

void setup() {
  myservo.attach(15);
   myservo.write(0);  
}

void loop() {

  myservo.write(0);
  delay(1000);                         
  myservo.write(90);
  delay(1000);                         
  myservo.write(180);
}