====== LED 깜박이기 ======

<code c>
#define LED_PIN 13
void setup() {
    pinMode(LED_PIN, OUT);
}

void loop() {
    digitalWrite(LED_PIN, HIGH);
    delay(1000);
    digitalWrite(LED_PIN, LOW);
    delay(1000);
}
</code>


http://donghee8.com/dropbox/docs/workshop/BYTT/bytt-physicalcomp.html