#include <ESP32Servo.h>

Servo myservo;  // create servo object to control a servo
int pos = 0;    // variable to store the servo position

void setup() {
myservo.setPeriodHertz(50);    // standard 50 hz servo
myservo.attach(20, 500, 2400);  // attaches the servo on GPI20 to the servo object
      // and sets min and max microseconds (the 544 and 2400 are defaults for 0 and 180 degrees)
}

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