아두이노 교육2일차 외부인터럽트

boolean ledFlag = LOW;

void setup()  {
  pinMode(12, OUTPUT);
  pinMode(2, INPUT_PULLUP);
  attachInterrupt(0, interrupt, FALLING);  // RISING, FALLING, CHANGE
  digitalWrite(12, LOW);
}

void loop()  {
}

void interrupt()  {
  ledFlag = !ledFlag;
  digitalWrite(12, ledFlag);
}