DS1307 & TM1637 with Arduino

Making a Digital clock with Arduino boards.  

Components
• Arduino board
• DS1307 RTC Module  I2C (SDA and SCL)
• TM1637 7-segment I2C (CLK and DIO)

The DS1307 uses I2C Protocol to communicate with arduino.
There are a lot of examples on the Web to show how to use Wire library.
The Wire library  makes DS1307 RTC easier  to use for getting/setting the time.Driver IC: DS1307 real clock

SCL:  Analog 5  (clock line)
SDA:  Analog 4  (data line)
Voltage: +3.3V to +5V
GND:  GND of Arduino

Typically you want to use 2.2K or 2.4K resistors between each of the SDA and SCL pins and  +3.3v of arduino.

For my module, I do NOT need pull-up resistors.
The TM1637 also uses I²C Protocol to communicate with arduino.

Driver IC: TM1637 display 7-Segment
Voltage: +3.3V to +5V
Interface: I²C
CLK: Digital 9
DIO: Digital 8
GND:  GND of Arduino
8 adjustable luminance levels

The CLK and DIO on display can connect to any of arduino digital pins. I use for DIO pin the D8 and for CLK pin the D9 Pins.

Arduino libraries: RTClib

// DS1307 TM1637 7-segment with Arduino;
#include "TM1637.h";
// pins definitions for TM1637 and can be changed to other ports
#define CLK 2
#define DIO 3TM1637 
tm1637(CLK,DIO);
// Holds current clock 
timeRTC_DS1307 RTC;
DateTime theTime;
int8_t TimeDisp[] = {0xff, 0xff, 0xff, 0xff};
voidsetup() {  
  Serial.begin(9600);
  if (!RTC.begin()) {   
    Serial.println("Could not find RTC");    
    while(1);  
  }  
  if (!RTC.isrunning()) {
    Serial.println("RTC is NOT running!");    
    RTC.adjust(DateTime(F(__DATE__), F(__TIME__)));
  }
  tm1637.init();
  tm1637.set(2);
  // TYPICAL = 2, DARKEST = 0, BRIGHTEST = 7;
  tm1637.display(0,10);
  // show A B C D for testing;
  tm1637.display(1,11);
  tm1637.display(2,12);
  tm1637.display(3,13);
  delay(3000);
}
int hour, minute, second;
unsigned char ClockPoint = 1;
voidloop() {
  DateTime theTime = RTC.now();  second = theTime.second();
  // get seconds  minute = theTime.minute();
  // get minutes  TimeDisp[0] = minute / 10;
  TimeDisp[1] = minute % 10;
  TimeDisp[2] = second / 10;
  TimeDisp[3] = second % 10;
  tm1637.display(0,TimeDisp[0]);
  tm1637.display(1,TimeDisp[1]);
  tm1637.display(2,TimeDisp[2]);
  tm1637.display(3,TimeDisp[3]);
  Serial.print("Set to ");
  Serial.print(hour);
  Serial.print(":");
  Serial.print(minute);
  Serial.print(":");
  Serial.print(second);
  Serial.println();
  ClockPoint = (~ClockPoint) && 0x01;
  if(ClockPoint)
    tm1637.point(POINT_ON);
  else 
    tm1637.point(POINT_OFF);
  delay(1000);
}