#include <Arduino.h>                  //Just in case
#include <Servo.h>                    //Standard AVR 8bit Servo library
#define LED LED_BUILTIN               //Pin 13 is the Inbuilt LED
#define PERIOD 3000UL                 //5 second time period
#define HOME 40                       //Servo HOME position
#define POS1 140                      //Servo second position 
bool run = 0;                         //Run sequence flag
uint32_t previousMillis = 0;          //Capture current clock to start the timer
Servo servo;                          //Create a Servo object

void falling (void){                  //Interrupt statement
  detachInterrupt(0);                 //Detach interrupt while a timer is running
  run = true;                         //Run flag is true now
  servo.write(POS1);                  //Move servo
  digitalWrite(LED, HIGH);            //Turn on the LED for a ON visual
  previousMillis = millis();          //Starts out timer
}

void setup() {
  pinMode(LED, OUTPUT);                           //Creates the LED Pin as Output
  pinMode(2, INPUT_PULLUP);                       //Use the internal "PULLUP" for Active LOW (falling)
  servo.attach(14);                               //Attach servo to A0 (D14)
  servo.write(HOME);                              //Move servo to start position
  attachInterrupt(0, falling, FALLING);           //Attach interrupt and wait for it to trigger
}

void loop() {
  if(run){                                        //Only when TRUE we look inside
    if(millis() - previousMillis >= PERIOD){      //5 second timer when run is true
      servo.write(HOME);                          //Move servo home after 5 seconds
      run = false;                                //Clear run flag
      digitalWrite(LED, LOW);                     //Turn off LED
      attachInterrupt(0, falling, FALLING);       //re-attach interrupt for new trigger watch
    }
  }
}