#include <Servo.h> // import the Servo library
Servo servo;  // create servo object to control a servo

#define SECONDS 5 // seconds servo will be at 180 degrees
#define SLOWER 15 // value to slow servo movement
int buttonPin = 2; // declare a button pin
int servoPin  = 3; // declare the servo pin
int ledPin1   = 4; // add an LED on pin 4
int ledPin2   =12; // add an LED on pin 12

void setup() {
  Serial.begin(115200);
  pinMode(buttonPin, INPUT_PULLUP);
  pinMode(ledPin1, OUTPUT);
  pinMode(ledPin2, OUTPUT);
  servo.attach(servoPin); // attach the servo instance to the servo PWM pin
  servo.write(0); // rotate the servo to 90 degrees.
}

void loop() {
  digitalWrite(ledPin2, HIGH); // turn LED ON
  if (!digitalRead(buttonPin)) { // is the button pressed?
    delay(50); // this is a quck way to debounce the button ringing noise
    if (digitalRead(buttonPin)) { // is the button released?

      digitalWrite(ledPin2, LOW); // turn LED OFF

      for (int i = 0; i < 180; i++) {
        servo.write(i); // rotate the servo to 180 degrees
        delay(SLOWER);
      }

      digitalWrite(ledPin1, HIGH); // turn LED ON
      for (int i = 0; i < SECONDS; i++) {
        Serial.print(5 - i);
        delay(1000); // one second
      }
      digitalWrite(ledPin1, LOW); // turn LED OFF
      Serial.println("0");

      for (int i = 0; i < 180; i++) {
        servo.write(180 - i); // rotate the servo to 0 degrees
        delay(SLOWER);
      }
    }
  }
}