int rLED = 1;
int ledState = LOW;

volatile boolean interruptButton = false; 

unsigned long previousMillis = 0; 

const long intervalOn = 200;
const long intervalOff = 100;

void setup()
{
  attachInterrupt(2, interruptFunction, FALLING);
  pinMode(rLED, OUTPUT);
  digitalWrite (rLED, LOW);
}

void loop()
{
  if (interruptButton == true) 
   {
    digitalWrite (rLED, LOW);
   } 
  else 
{
    previousMillis = millis();
    while ((millis() - previousMillis) <= intervalOn)
  {
    ledState = HIGH;
    digitalWrite (rLED, ledState);
  }
  
   previousMillis = millis();
   while ((millis() - previousMillis) <= intervalOff)
  {
    ledState = LOW;
    digitalWrite (rLED, ledState);
  }
}
}

void interruptFunction()
{
  if (interruptButton == false)
  {
    interruptButton = true;
  }
  else
  {
    interruptButton = false;
  } 
}