#include <ESP32Servo.h>

Servo myservo;  // create servo object to control a servo
int servo_angle = 0;    // variable to store the servo position
#define SERVOPIN 14     // Recommended PWM GPIO pins on the ESP32 include 2,4,12-19,21-23,25-27,32-33 

void setup() {
  // put your setup code here, to run once:
  myservo.attach(SERVOPIN);   // attaches the servo on pin 18 to the servo object
                              // using default min/max of 1000us and 2000us
                              // different servos may require different min/max settings
                              // for an accurate 0 to 180 sweep
}

void loop() {
  for (servo_angle = 0; servo_angle <= 180; servo_angle += 10) { // goes from 0 degrees to 180 degrees in steps of 1 degree
    myservo.write(servo_angle);                                 // tell servo to go to position in variable 'pos'
    delay(50);                                                  // waits 15ms for the servo to reach the position
  }
  for (servo_angle = 180; servo_angle >= 0; servo_angle -= 10) { // goes from 180 degrees to 0 degrees
    myservo.write(servo_angle);                                 // tell servo to go to position in variable 'pos'
    delay(50);                                                  // waits 15ms for the servo to reach the position
  }
}