#include <Servo.h>

Servo miServo;

int servoPin = D0;
int ledPin = D9;

void setup() {
  miServo.attach(servoPin);
  pinMode(ledPin, OUTPUT);
}

void loop() {
  miServo.write(0);
  digitalWrite(ledPin, HIGH);
  delay(2000);

  miServo.write(90);
  delay(2000);

  miServo.write(180);
  delay(2000);

  digitalWrite(ledPin, LOW);
  delay(2000);
}