#include <ESP32Servo.h>
int servoPin = 4;

Servo myservo;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  myservo.attach(4);
}

void loop() {
  myservo.write(0);
  delay(500);
  myservo.write(150);
  delay(500);
}