#include <ESP32Servo.h>

Servo myservo;  
int potpin =26 ;  
int val;    

void setup() {
  myservo.attach(18);
}

void loop() {
  val = analogRead(potpin);            
  val = map(val, 0, 1023, 0, 180);     
  myservo.write(val);                  
  delay(50);                          
}