#include <ESP32Servo.h>

const int servoPin = 18;
Servo servo;

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

void loop() {
  // put your main code here, to run repeatedly:
  servo.write(0);
  delay(1000);
  servo.write(90);
  delay(1000);
  servo.write(180);
  delay(1000); 
}