#include <ESP32Servo.h>
Servo myservo;
float pos = 0.0;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
myservo.attach(15);
}

void loop() {
  // put your main code here, to run repeatedly:
  for (pos = 0; pos <= 180; pos++) {
      myservo.write(pos);
     delay(20);
  }
    for (pos = 180; pos >= 0; pos--) {
      myservo.write(pos);
     delay(20);
  }
}