#include <ESP32Servo.h>
Servo myservo;

int servoPin = 19;

void setup() 
{

myservo.attach(servoPin); 

}

void loop() 
{

myservo.write(90);
delay(1000);
myservo.write(180);
delay(1000);
myservo.write(0);
delay(1000);

}