#include <SevSeg.h>

SevSeg sevseg;
int seconds = 0; 
unsigned long previousMillis = 0; 
const long interval = 1000; 

void setup() {
  byte numDigits = 4;
  byte digitPins[] = {2, 3, 4, 5}; 
  byte segmentPins[] = {6, 7, 8, 9, 10, 11, 12, 13}; 

  sevseg.begin(COMMON_CATHODE, numDigits, digitPins, segmentPins);
  sevseg.setBrightness(90); 
}

void loop() {
  unsigned long currentMillis = millis(); 

  if (currentMillis - previousMillis >= interval) {
    previousMillis = currentMillis; 
    seconds++; 

    if (seconds > 9999) {
      seconds = 0;
    }

    sevseg.setNumber(seconds); 
  }

  sevseg.refreshDisplay(); 
}