// Free Ebook Arduino
// www.elangsakti.com
// coder elangsakti
// Inisialisasi Pin LED
const int pinLED1 = 8;
const int pinLED2 = 9;
const int pinLED3 = 10;
const int pinLED4 = 11;
void setup() {
 // pin LED sebagai output
 pinMode(pinLED1, OUTPUT);
 pinMode(pinLED2, OUTPUT);
 pinMode(pinLED3, OUTPUT);
 pinMode(pinLED4, OUTPUT);
}
void loop() {
 digitalWrite(pinLED1, LOW);
 digitalWrite(pinLED2, LOW);
 digitalWrite(pinLED3, LOW);
 digitalWrite(pinLED4, LOW);
 delay(1000);
 digitalWrite(pinLED1, HIGH);
 delay(1000);
 digitalWrite(pinLED2, HIGH);
 delay(1000);
 digitalWrite(pinLED3, HIGH);
 delay(1000);
 digitalWrite(pinLED4, HIGH);
 delay(1000);
}