#include <ESP32Servo.h>

Servo myServo;  // create servo object

void setup() {
  myServo.attach(19);  // attach servo to pin 9
}

void loop() {
  myServo.write(0);    // move to 0°
  delay(1000);

  myServo.write(90);   // move to 90°
  delay(1000);

  myServo.write(180);  // move to 180°
  delay(1000);
}