//Set pin
const int ledRed = 3;
const int ledYel = 5;
const int ledGrn = 7;
int cdly = 2000; int i;

void setup() {
  // Set pin sebagai ouput
pinMode(ledRed, OUTPUT);
pinMode(ledYel, OUTPUT);
pinMode(ledGrn, OUTPUT);
}

void loop() {
// menyalakan LED
digitalWrite(ledRed, HIGH);
digitalWrite(ledYel, HIGH);
digitalWrite(ledGrn, HIGH); 
delay (cdly);
digitalWrite(ledRed, LOW);
digitalWrite(ledYel, LOW);
digitalWrite(ledGrn, LOW); 
delay (cdly);
cdly = cdly - 250;
if (cdly <= 250){
  cdly = 250;
}
}