#define ledRed 2
#define ledYel 3

unsigned long previousMillisRed = 0;
unsigned long previousMillisBlue = 0;

const unsigned long intervalMerahNyala = 5000;
const unsigned long intervalMerahMati = 5000;

const unsigned long intervalYelNyala = 5000;
const unsigned long intervalYelMati = 10000;

bool ledStateRed = 1;
bool ledStateYel = 1;

unsigned long currentMillis;

void setup() {
  pinMode(ledRed, OUTPUT);
  pinMode(ledYel, OUTPUT);
  digitalWrite(ledRed, ledStateRed);
  digitalWrite(ledYel, ledStateYel);
}

void loop() {
  currentMillis = millis();

  if (ledStateRed == 1 && currentMillis - previousMillisRed >= intervalMerahNyala) {
    ledStateRed = 0;
    digitalWrite(ledRed, ledStateRed);
    previousMillisRed = currentMillis;
  } 
  else if (ledStateRed == 0 && currentMillis - previousMillisRed >= intervalMerahMati) {
    ledStateRed = 1;
    digitalWrite(ledRed, ledStateRed);
    previousMillisRed = currentMillis;
  }

  if (ledStateYel == 1 && currentMillis - previousMillisBlue >= intervalYelNyala) {
    ledStateYel = 0;
    digitalWrite(ledYel, ledStateYel);
    previousMillisBlue = currentMillis;
  } 
  else if (ledStateYel == 0 && currentMillis - previousMillisBlue >= intervalYelMati) {
    ledStateYel = 1;
    digitalWrite(ledYel, ledStateYel);
    previousMillisBlue = currentMillis;
  }
}