#include <SevSeg.h>

// Create SevSeg object
SevSeg sevseg;

// Define pins for the 7-segment display

#define digit3 11
#define digit4 12
#define segmentA 4
#define segmentB 5
#define segmentC 6
#define segmentD 7
#define segmentE 8
#define segmentF 9
#define segmentG 10

// Define time variables
unsigned long previousMillis = 0;
const long interval = 1000;  // Update every 1 second
int countdownSeconds = 15;   // Initial countdown value

void setup() {
  // Initialize SevSeg
  byte numDigits = 2;
  byte digitPins[] = {digit3, digit4};
  // bool resistorsOnSegments = true;
  byte hardwareConfig = COMMON_CATHODE;
  byte segmentPins[] = {4, 5, 6, 7, 8, 9, 10};
  sevseg.begin(hardwareConfig, numDigits, digitPins, segmentPins);

  // Set brightness (optional)
  sevseg.setBrightness(100);
}

void loop() {
  // Get the current time
  unsigned long currentMillis = millis();

  // Check if one second has passed
  if (currentMillis - previousMillis >= interval) {
    // Update the timer
    updateTimer();
    
    // Save the current time for the next iteration
    previousMillis = currentMillis;
  }

  // Display the countdown on the 7-segment display
  sevseg.setNumber(countdownSeconds, 0);
  sevseg.refreshDisplay();
}

void updateTimer() {
  // Decrease the countdown by one second
  countdownSeconds--;

  // Check if the countdown has reached zero
  if (countdownSeconds < 0) {
    // Reset the countdown
    countdownSeconds = 15;
  }
}