#include <SevSeg.h>
SevSeg sevseg;

byte ledMerah = 11;
byte ledKuning = 12;
byte ledHijau = 13;

void setup() {
  byte numDigits = 2;
  byte digitPins[] = {2, 3};
  byte segmentPins[] = {4, 5, 6, 7, 8, 9, 10};
  bool resistorsOnSegments = true; // 'false' means resistors are on digit pins
  byte hardwareConfig = COMMON_ANODE; // See README.md for options
  bool updateWithDelays = false; // Default 'false' is Recommended
  bool leadingZeros = true; // Use 'true' if you'd like to keep the leading zeros
  bool disableDecPoint = true; // Use 'true' if your decimal point doesn't exist or isn't connected

  sevseg.begin(hardwareConfig, numDigits, digitPins, segmentPins, resistorsOnSegments,
               updateWithDelays, leadingZeros, disableDecPoint);
  sevseg.setBrightness(90);

  pinMode(ledMerah, OUTPUT);
  pinMode(ledKuning, OUTPUT);
  pinMode(ledHijau, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  static unsigned long timer = millis();
  static int seconds = 20;

  if (millis() - timer >= 1000) {
    timer += 1000;
    seconds--; // 1000 milliSeconds is equal to 1 Second

    if (seconds == 0) {
      sevseg.setChars("--");
      return;
    } else if (seconds == -1) {
      seconds = 20;
    }
    sevseg.setNumber(seconds, 0);
    Serial.print("Seconds = ");
    Serial.println(seconds);
  }

  sevseg.refreshDisplay(); // Must run repeatedly
}