#include <TM1637.h>

const int CLK = 2;
const int DIO = 4;

unsigned long previousMillis = 0;
const long interval = 1000;  // Interval between countdown updates in milliseconds (1 second)
int minutes = 70;           // Initial minutes value
int seconds = 0;

TM1637 tm(CLK, DIO);

void setup() {
  tm.init();
  tm.set(BRIGHT_TYPICAL);
}

void updateCountdown() {
  unsigned long currentMillis = millis();
  if (currentMillis - previousMillis >= interval) {
    previousMillis = currentMillis;

    if (seconds > 0) {
      seconds--;  // Decrement seconds
    } else {
      if (minutes > 0) {
        minutes--;     // Decrement minutes if seconds reach 0
        seconds = 59;  // Reset seconds to 59
      } else {
        // Countdown finished, you can reset it or stop the countdown
        minutes = 0;
        seconds = 0;
      }
    }

    // Display minutes and seconds on the TM1637
    tm.display(0, (minutes / 10) % 10); // Tens place of minutes
    tm.display(1, minutes % 10);        // Ones place of minutes
    tm.display(2, (seconds / 10) % 10); // Tens place of seconds
    tm.display(3, seconds % 10);        // Ones place of seconds

    tm.point(true);
  }
}

void loop() {
  updateCountdown();
}