#include <TM1637Display.h>


// Countdown Timer
const unsigned long COUNTDOWN_TIME = 5; // 5 minutes in seconds = 3--


// Pins for TM1637 display module
#define CLK_PIN 2
#define DIO_PIN 3

int RELAY1 = 8; //POWER RELAY

TM1637Display display(CLK_PIN, DIO_PIN);


unsigned long startTime;
unsigned long currentTime;
unsigned long elapsedTime;



void setup() {

  pinMode(RELAY1, OUTPUT);
  pinMode(RELAY1, LOW); //light is OFF
  Serial.begin(9600);    


  display.setBrightness(7); // Set the brightness of the display (0-7)
  display.clear(); // Clear the display
  startTime = millis(); // Record the starting time
}


void loop() {

  currentTime = millis(); // Get the current time
  elapsedTime = (currentTime - startTime) / 1000; // Calculate elapsed time in seconds

  
  if (elapsedTime <= COUNTDOWN_TIME) {
    digitalWrite(RELAY1, HIGH); //lights ON  
    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);
        Serial.print("TIME: ");
        Serial.println(elapsedTime);
        
    if (remainingTime == 0) {
      // Start blinking when countdown reaches 00:00

      while (true) {
            //digitalWrite(RELAY1, HIGH); //lights ON
            digitalWrite(RELAY1, LOW); //lights OFF
 //         Serial.print("REAMAINING: ");
 //         Serial.println(elapsedTime);  
        
        display.showNumberDecEx(0, 0b01000000, true); // Display "00:00"
        delay(500);
        display.clear(); // Clear the display
        delay(500);
        Serial.print(elapsedTime);
        //input Ultrasonic here again
        exit(0);
        return loop();
      }
    }
  }
  delay(1000); // Wait for 1 second
}