Published May 15, 2025 © Apache-2.0

MiniTimekeeper

NanoClock shows real-time using Arduino Nano, DS1307, and TM1637, with buzzer alerts — simple, smart, and perfect for beginners.

IntermediateShowcase (no instructions)24 hours77

Things used in this project

Hardware components

TinyCircuits TinyShield Real-Time Clock

Story

The goal of this project is to build an accurate digital clock using an Arduino Nano that displays the time in hours and minutes (HH:MM).To achieve this, a precise Real-Time Clock (RTC) module, the DS3231, is used. This module keeps track of time even during power outages, thanks to its built-in battery. The Arduino reads the time data from the module and displays it on a 4-digit TM1637 display.

An important feature has also been added to the clock design:The two dots between the hours and minutes blink every second, turning on and off to indicate the passage of time.

Let me know if you want a shorter or more technical version too!

clock

bread board
#include <Wire.h>
#include <RTClib.h>
#include <TM1637Display.h>
#define CLK 2   
#define DIO 3  

RTC_DS3231 rtc;
TM1637Display display(CLK, DIO);

void setup() {
  Wire.begin();
  display.setBrightness(7); 

  if (!rtc.begin()) {
    while (1);  
  }

  
   rtc.adjust(DateTime(2025, 5, 13, 19, 34, 0));
}

void loop() {
  DateTime now = rtc.now();

  int hour = now.hour();
  int minute = now.minute();


  int displayTime = hour * 100 + minute;


  bool showDots = now.second() % 2;

ه
  display.showNumberDecEx(displayTime, showDots ? 0b01000000 : 0, true);

  delay(1000);
}

Credits

Narin Jvnmrdn

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MiniTimekeeper

Things used in this project

Hardware components

Story

Code

clock

Credits

Narin Jvnmrdn

Comments

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MiniTimekeeper

MiniTimekeeper

Things used in this project

Hardware components

Story

Code

clock

Credits

Narin Jvnmrdn

Comments

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