TM1637 4-Digit Display Clock Arduino Project

 This project shows you how to make a digital clock using a TM1637 4-digit 7-segment display with Arduino.

TM1637 4-Digit Display Clock Source Code

	// arduinogeeks.blogspot.com
	// Digital 24 hour time format clock by Arduino, TM1637 4 digit 7 segment display and DS32321 RTC
	// Add libraries: RTClib and TM1637
	#include "RTClib.h"
	#include <TM1637Display.h>
	// Define the connections pins for TM1637 4 digit 7 segment display
	#define CLK 8
	#define DIO 9
	// Create rtc and display object
	RTC_DS3231 rtc;
	TM1637Display display = TM1637Display(CLK, DIO);
	void setup() {
	// Begin serial communication at a baud rate of 9600
	Serial.begin(9600);
	// Wait for console opening
	delay(3000);
	// Check if RTC is connected correctly
	if (! rtc.begin()) {
	Serial.println("Couldn't find RTC");
	while (1);
	}
	// Check if the RTC lost power and if so, set the time:
	if (rtc.lostPower()) {
	Serial.println("RTC lost power, lets set the time!");
	// The following line sets the RTC to the date & time this sketch was compiled:
	rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
	// This line sets the RTC with an explicit date & time, for example to set
	// January 21, 2014 at 3am you would call:
	//rtc.adjust(DateTime(2014, 1, 21, 3, 0, 0));
	}
	// Set the display brightness (0-7):
	display.setBrightness(5);
	// Clear the display:
	display.clear();
	}
	void loop() {
	// Get current date and time
	DateTime now = rtc.now();
	// Create time format to display:
	int displaytime = (now.hour() * 100) + now.minute();
	// Print displaytime to the Serial Monitor
	Serial.println(displaytime);
	// Display the current time in 24 hour format with leading zeros enabled and a center colon:
	display.showNumberDecEx(displaytime, 0b11100000, true);
	// Remove the following lines of code if you want a static instead of a blinking center colon:
	delay(1000);
	display.showNumberDec(displaytime, true); // Prints displaytime without center colon.
	delay(1000);
	}

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