arduino tm1637 00:00

// tm1637_time.ino

#include "RTClib.h"

#include <TM1637Display.h>

#define CLK 13

#define DIO 12

RTC_DS3231 rtc;

TM1637Display display = TM1637Display(CLK, DIO);

void setup() {

  Serial.begin(9600);

  display.setBrightness(5);

  display.clear();

}

void loop() {

    DateTime now ;

    int displaytime, mm,ss;

    static int cnt;

    char str[10];

    while(1)

    {

      mm=(cnt/60) %60;

      ss=(cnt%60);

      displaytime = mm*100+ ss;

      Serial.print(displaytime);

      Serial.print("\t");

      sprintf(str,"%02d:%02d",mm,ss);Serial.println(str);

      display.showNumberDecEx (displaytime, 0b11100000, true);   delay(100);

      display.showNumberDec   (displaytime, true);               delay(100);

      cnt++;

    }

}