#include <TM1637Display.h>
// Countdown Timer
unsigned long COUNTDOWN_TIME = 190; // 3:10 minutes in seconds
// Pins for TM1637 display module
#define CLK_PIN 2
#define DIO_PIN 3

TM1637Display display(CLK_PIN, DIO_PIN);

int addButton = 6;
unsigned long startTime;
unsigned long currentTime;
unsigned long elapsedTime;

//----------------------------------------------------------------------
void setup() {
  display.setBrightness(7); // Set the brightness of the display (0-7)
  display.clear(); // Clear the display
  startTime = millis(); // Record the starting time
  pinMode(addButton, INPUT_PULLUP);
}
//----------------------------------------------------------------------
void loop() {
  if (digitalRead(addButton) == LOW)
  {
    delay(30);
    if (digitalRead(addButton) == LOW)
    {
      COUNTDOWN_TIME = COUNTDOWN_TIME + 30;
      while(digitalRead(addButton) == LOW){}
    }
  }
  currentTime = millis(); // Get the current time
  elapsedTime = (currentTime - startTime) / 1000; // Calculate elapsed time in seconds

  if (elapsedTime <= COUNTDOWN_TIME) {
    unsigned long remainingTime = COUNTDOWN_TIME - elapsedTime;

    // Display remaining time in Minutes:Seconds format
    unsigned int minutes = remainingTime / 60;
    unsigned int seconds = remainingTime % 60;
    display.showNumberDecEx(minutes * 100 + seconds, 0b01000000, true);

    if (remainingTime == 0) {
      // Start blinking when countdown reaches 00:00
      while (true) {
        display.showNumberDecEx(0, 0b01000000, true); // Display "00:00"
        delay(500);
        display.clear(); // Clear the display
        delay(500);
      }
    }
  }
}








/*#include <Arduino.h>
  #include <TM1637Display.h>

  // Module connection pins (Digital Pins)
  #define CLK 2
  #define DIO 3


  TM1637Display display(CLK, DIO);

  void setup()
  {
  display.setBrightness(0x0f);
  display.showNumberDec(1200);
  }

  void loop()
  {
  }*/