/*
8mm LED
+--------------------------+
| Arduino | 8mm LED |
+--------------------------+
| GND | GND |
| 5V | VCC |
| IN | D9 |
+--------------------------+
*/
void setup() {
pinMode(9, OUTPUT);
}
void loop() {
digitalWrite(9, HIGH); // LED ON
delay(1000); // 1000 millisecond = 1초, 10000 milisecond = 10초
digitalWrite(9, LOW); // LED OFF
delay(1000);
}