//Set pin
const int ledRed = 7;
const int ledYel = 5;
const int ledGrn = 3;
int d ;
void setup() {
  // Set pin sebagai ouput
pinMode(ledRed, OUTPUT);
pinMode(ledYel, OUTPUT);
pinMode(ledGrn, OUTPUT);
}

void loop() {
//Pengaturan delay
for (d=2000; d=d-20)
// menyalakan LED Kanan


digitalWrite(ledRed, HIGH);
digitalWrite(ledYel, HIGH);
digitalWrite(ledGrn, HIGH);
delay (d);
digitalWrite(ledRed, LOW);
digitalWrite(ledYel, LOW);
digitalWrite(ledGrn, LOW);
delay (d);
}