/**********************************************************************************
Declaer Variable
***********************************************************************************/

#define Delay_T1 (500)                  // Delay Time 1
#define Sprintln(a) (Serial.println(a))
#define Sprint(a)   (Serial.print(a))

const byte ledPin  = 13;              //Declaer Variable pin = Pni number 13
const byte interruptPin = 2;          //Interrupt Pin 2
volatile int state = LOW;             //Intitial State == LOW (0)
volatile int prev_state = LOW;             //Intitial State == LOW (0)


unsigned long 
last_time_1 = 0,        //Counter timer 1 
Timer_T1    = 5;      //Delay Timer number 1


/**********************************************************************************
Function Name:   setup Loop
Description:  Hardware setup loop control 
Parameters:   void
Return value: void
***********************************************************************************/
void setup() 
{
  Serial.begin(115200);     //Start serial debuging
  
  pinMode(ledPin, OUTPUT);                      //Set pon mode

  pinMode(interruptPin, INPUT_PULLUP);          //Set Interrupt pin

  attachInterrupt(digitalPinToInterrupt(interruptPin), blink, FALLING);  //Attach Interrupt
}
/**********************************************************************************
Function Name:   Main Loop
Description:  
Parameters:   void
Return value: void
***********************************************************************************/
void loop() 
{
  digitalWrite(ledPin,state);
  Sprint("state : ");
  Sprintln(state);
  delay(1000);
}
/**********************************************************************************
Function Name:   blink
Description:  
Parameters:   void 
Return value: void
***********************************************************************************/
void blink()
{
  if((millis()-last_time_1) >= Timer_T1)          //Call timer interrupt millis() for check event time 250 mS
  {
    last_time_1 = millis();                       //Update current timer

    state ^= 1;   //Invest  variable stat

  }
}
/**********************************************************************************
***********************************************************************************/