#include <ESP32Servo.h>
const int servopin = 15;
Servo servo;
int  pos = 0;

void setup(){
  Serial.begin(115200);
  Serial.println("hello, ESP32");
  servo.attach(servopin,500, 2400);
}

void loop(){
  for (pos = 0; pos<=180; pos +=1){
    servo.write(pos);
    delay(15);
    
  }
  for (pos = 180; pos >=0; pos -=1){
    servo.write(pos);
    delay(15);
  }
}