volatile int ledState; 
volatile int ledState1; 
void setup() 
{ 
  pinMode(13, OUTPUT); 
   pinMode(12, OUTPUT); 
  pinMode(5, INPUT_PULLUP); 
   pinMode(4, INPUT_PULLUP); 
  Serial.begin(9600); 
  Serial.println("STM");
  attachInterrupt(digitalPinToInterrupt(5), blinkLed, RISING); 
  attachInterrupt(digitalPinToInterrupt(4), blinkLed1, RISING); 
} 
void loop() 
{ 
  // nothing here!

} 
void blinkLed()
 { 
  ledState = digitalRead(5); 
  Serial.println(ledState); 
  if(ledState == 0) 
  { 
    digitalWrite(13, HIGH);
  } 
  else 
  { 
    digitalWrite(13, LOW);
  }
}
void blinkLed1()
 { 
  ledState1 = digitalRead(4); 
  Serial.println(ledState1); 
  if(ledState1 == 0) 
  { 
    digitalWrite(12, HIGH);
  } 
  else 
  { 
    digitalWrite(12, LOW);
  }
}