Published October 24, 2020 © GPL3+

Arduino seven segment clock

Arduino ds1307 7-segment clock

AdvancedFull instructions provided4,265

Things used in this project

Hardware components

Arduino Nano R3

Texas Instruments Shift Register- Serial to Parallel

Resistor 10k ohm

Resistor 100 ohm

General Purpose Transistor NPN

Solderless Breadboard Full Size

Jumper wires (generic)

Seeed Studio Pi RTC (DS1307)

7 Segment LED Display, InfoVue

Software apps and online services

Arduino IDE

Story

about the project :-

I have designed a new arduino clock which displays the time on seven segment displays.I combined an arduino and ds1307 RTC module to complete the task

Hardware list :-

Arduino nano

Seven segment display(common anode) *6

SN74HC595 shift register * 2

Bc547 Transistors(n p n)*6

DS1307 RTC module

10k pullup register

100E resistor

breadboard and jumper wires

DS1307 RTC :-

to communicate with RTC module I have installed #include <RTClib.h> library from the library manager RTC modules talks with arduino through I2C communication to join the I2C bus between Master and Slave we connect Arduino analog pin A4 to SDA pin of RTC and A5 pin of arduino to SCL pin of RTC and add 10k pullup registers.

Shift register :-

I have used SN74HC595 shift registers because it can be controlled by arduino very easily I have used one shift register to control the 7 segments of the displays and another shift register is used for multiplexing.multiplexing is a technique of displaying different numbers on the displays and matrix.

seven segment display :-

for this project we need 6 7-segment display to display the time I am using common anode type display

Wiring :- just complete the wiring the help of my circuit and after you are done check all the connections again to reduce the errors

Code :-

copy my code and paste it on your Arduino editor and upload it to your arduino board and your clock is ready

Awesome

Success!

Author - Ramji Patel Jhansi

pictures:-

1 / 11

Code

Arduino 7segment clock code

#include <Wire.h>
#include <RTClib.h>

RTC_DS1307 RTC;

int HOUR, MINUT, SECOND;
int latchPin = 4; //pin 12 on the 595 o3 3
int dataPin = 2; //pin 14 on the 595 or 4
int clockPin = 3; //pin 11 on the 595 or 2
int shift = 256;
int units, tens, hundreds, thousands,tenthousand,lakh;
int times = 1;
const int alarmHour = 17;
const int alarmMinute = 26;

void setup() {
  Serial.begin(9600);
  pinMode(latchPin, OUTPUT);
  pinMode(dataPin, OUTPUT);
  pinMode(clockPin, OUTPUT);
  pinMode(13, OUTPUT);
  Wire.begin();
  RTC.begin();
  if (!RTC.isrunning())
  {
    RTC.adjust(DateTime(__DATE__, __TIME__));
  }
}

void loop() {
  
  DateTime now = RTC.now();
  HOUR = now.hour();
  MINUT = now.minute();
  SECOND = now.second();
  //Serial.println(MINUT);
  if (HOUR < 10)
  {
    tenthousand = HOUR;
    lakh  = HOUR/10;
  }
  else if (HOUR >=  10 && HOUR < 24)
  {
    tenthousand = HOUR % 10;
    lakh = HOUR / 10;
  }
  if (MINUT <= 9)
  {
    hundreds = MINUT;
    thousands = MINUT/10;
  }

  else if (MINUT > 9 && MINUT <= 60)
  {
    hundreds = MINUT % 10;
    thousands = MINUT / 10;
  }
   if (SECOND <= 9)
  {
    units = SECOND;
    tens = SECOND/10;
  }

  else if (SECOND > 9 && SECOND <= 60)
  {
    units = SECOND % 10;
    tens = SECOND / 10;
  }

  switch (hundreds)
  {
    case 0:
      //0
      digitalWrite(latchPin, LOW);
      shiftOut(dataPin, clockPin, MSBFIRST, shift * 8  >> 8 );
      shiftOut(dataPin, clockPin, MSBFIRST, 0B01000000 );
      digitalWrite(latchPin, HIGH);
      break;
    case 1:
      //1
      digitalWrite(latchPin, LOW);
      shiftOut(dataPin, clockPin, MSBFIRST, shift * 8  >> 8 );
      shiftOut(dataPin, clockPin, MSBFIRST, 0B01111001);
      digitalWrite(latchPin, HIGH);
      break;
    case 2:
      //2
      digitalWrite(latchPin, LOW);
      shiftOut(dataPin, clockPin, MSBFIRST, shift * 8  >> 8 );
      shiftOut(dataPin, clockPin, MSBFIRST, 0B00100100);
      digitalWrite(latchPin, HIGH);
      break;
    case 3:
      //3
      digitalWrite(latchPin, LOW);
      shiftOut(dataPin, clockPin, MSBFIRST, shift * 8 >> 8 );
      shiftOut(dataPin, clockPin, MSBFIRST, 0B00110000);
      digitalWrite(latchPin, HIGH);
      break;
    case 4:
      //4
      digitalWrite(latchPin, LOW);
      shiftOut(dataPin, clockPin, MSBFIRST, shift * 8 >> 8 );
      shiftOut(dataPin, clockPin, MSBFIRST, 0B00011001);
      digitalWrite(latchPin, HIGH);
      break;
    case 5:
      //5
      digitalWrite(latchPin, LOW);
      shiftOut(dataPin, clockPin, MSBFIRST, shift * 8 >> 8 );
      shiftOut(dataPin, clockPin, MSBFIRST, 0B00010010);
      digitalWrite(latchPin, HIGH);
      break;
    case 6:
      //6
      digitalWrite(latchPin, LOW);
      shiftOut(dataPin, clockPin, MSBFIRST, shift * 8   >> 8 );
      shiftOut(dataPin, clockPin, MSBFIRST, 0B00000010);
      digitalWrite(latchPin, HIGH);
      break;
    case 7:
      //7
      digitalWrite(latchPin, LOW);
      shiftOut(dataPin, clockPin, MSBFIRST, shift * 8  >> 8 );
      shiftOut(dataPin, clockPin, MSBFIRST, 0B01111000);
      digitalWrite(latchPin, HIGH);
      break;
    case 8:
      //8
      digitalWrite(latchPin, LOW);
      shiftOut(dataPin, clockPin, MSBFIRST, shift * 8  >> 8 );
      shiftOut(dataPin, clockPin, MSBFIRST, 0B00000000);
      digitalWrite(latchPin, HIGH);
      break;
    case 9:
      //9
      digitalWrite(latchPin, LOW);
      shiftOut(dataPin, clockPin, MSBFIRST, shift * 8  >> 8 );
      shiftOut(dataPin, clockPin, MSBFIRST, 0B00010000);
      digitalWrite(latchPin, HIGH);
      break;
  }
  delay(times);


  switch (thousands)
  {
    case 0:
      //0
      digitalWrite(latchPin, LOW);
      shiftOut(dataPin, clockPin, MSBFIRST, shift * 4  >> 8 );
      shiftOut(dataPin, clockPin, MSBFIRST, shift * 4 + 192 );
      digitalWrite(latchPin, HIGH);
      break;
    case 1:
      //1
      digitalWrite(latchPin, LOW);
      shiftOut(dataPin, clockPin, MSBFIRST, shift * 4   >> 8 );
      shiftOut(dataPin, clockPin, MSBFIRST, shift * 4 + 249);
      digitalWrite(latchPin, HIGH);
      break;
    case 2:
      //2
      digitalWrite(latchPin, LOW);
      shiftOut(dataPin, clockPin, MSBFIRST, shift * 4   >> 8 );
      shiftOut(dataPin, clockPin, MSBFIRST, shift * 4 + 164);
      digitalWrite(latchPin, HIGH);
      break;
    case 3:
      //3
      digitalWrite(latchPin, LOW);
      shiftOut(dataPin, clockPin, MSBFIRST, shift * 4   >> 8 );
      shiftOut(dataPin, clockPin, MSBFIRST, shift * 4 + 176);
      digitalWrite(latchPin, HIGH);
      break;
    case 4:
      //4
      digitalWrite(latchPin, LOW);
      shiftOut(dataPin, clockPin, MSBFIRST, shift * 4 >> 8 );
      shiftOut(dataPin, clockPin, MSBFIRST, shift * 4 + 153);
      digitalWrite(latchPin, HIGH);
      break;
    case 5:
      //5
      digitalWrite(latchPin, LOW);
      shiftOut(dataPin, clockPin, MSBFIRST, shift * 4   >> 8 );
      shiftOut(dataPin, clockPin, MSBFIRST, shift * 4 + 146);
      digitalWrite(latchPin, HIGH);
      break;
    
  }
  delay(times);

  switch (tenthousand)
  {
    case 0:
      //0
      digitalWrite(latchPin, LOW);
      shiftOut(dataPin, clockPin, MSBFIRST, shift * 2  >> 8 );
      shiftOut(dataPin, clockPin, MSBFIRST, shift * 2 + 64 );
      digitalWrite(latchPin, HIGH);
      break;
    case 1:
      //1
      digitalWrite(latchPin, LOW);
      shiftOut(dataPin, clockPin, MSBFIRST, shift * 2  >> 8 );
      shiftOut(dataPin, clockPin, MSBFIRST, shift * 2 + 121);
      digitalWrite(latchPin, HIGH);

      break;
    case 2:
      //2
      digitalWrite(latchPin, LOW);
      shiftOut(dataPin, clockPin, MSBFIRST, shift * 2  >> 8 );
      shiftOut(dataPin, clockPin, MSBFIRST, shift * 2 + 36);
      digitalWrite(latchPin, HIGH);
      break;
    case 3:
      //3
      digitalWrite(latchPin, LOW);
      shiftOut(dataPin, clockPin, MSBFIRST, shift * 2 >> 8 );
      shiftOut(dataPin, clockPin, MSBFIRST, shift * 2 + 48);
      digitalWrite(latchPin, HIGH);
      break;
    case 4:
      //4
      digitalWrite(latchPin, LOW);
      shiftOut(dataPin, clockPin, MSBFIRST, shift * 2 >> 8 );
      shiftOut(dataPin, clockPin, MSBFIRST, shift * 2 + 25);
      digitalWrite(latchPin, HIGH);
      break;
    case 5:
      //5
      digitalWrite(latchPin, LOW);
      shiftOut(dataPin, clockPin, MSBFIRST, shift * 2   >> 8 );
      shiftOut(dataPin, clockPin, MSBFIRST, shift * 2 + 18);
      digitalWrite(latchPin, HIGH);
      break;
    case 6:
      //6
      digitalWrite(latchPin, LOW);
      shiftOut(dataPin, clockPin, MSBFIRST, shift * 2   >> 8 );
      shiftOut(dataPin, clockPin, MSBFIRST, shift * 2 + 2);
      digitalWrite(latchPin, HIGH);
      break;
    case 7:
      //7
      digitalWrite(latchPin, LOW);
      shiftOut(dataPin, clockPin, MSBFIRST, shift * 2  >> 8 );
      shiftOut(dataPin, clockPin, MSBFIRST, shift * 2 + 120);
      digitalWrite(latchPin, HIGH);
      break;
    case 8:
      //8
      digitalWrite(latchPin, LOW);
      shiftOut(dataPin, clockPin, MSBFIRST, shift * 2  >> 8 );
      shiftOut(dataPin, clockPin, MSBFIRST, shift * 2 + 0);
      digitalWrite(latchPin, HIGH);
      break;
    case 9:
      //9
      digitalWrite(latchPin, LOW);
      shiftOut(dataPin, clockPin, MSBFIRST, shift * 2  >> 8 );
      shiftOut(dataPin, clockPin, MSBFIRST, shift * 2 + 16);
      digitalWrite(latchPin, HIGH);
      break;

  }
  delay(times);
 
  switch (lakh)
  {
    case 0:
      //0
      digitalWrite(latchPin, LOW);
      shiftOut(dataPin, clockPin, MSBFIRST, shift   >> 8 );
      shiftOut(dataPin, clockPin, MSBFIRST, shift  + 192 );
      digitalWrite(latchPin, HIGH);
      //delay(500);
      break;
    case 1:
      //1
      digitalWrite(latchPin, LOW);
      shiftOut(dataPin, clockPin, MSBFIRST, shift   >> 8 );
      shiftOut(dataPin, clockPin, MSBFIRST, shift  + 249);
      digitalWrite(latchPin, HIGH);
      //delay(500);
      break;
    case 2:
      //2
      digitalWrite(latchPin, LOW);
      shiftOut(dataPin, clockPin, MSBFIRST, shift   >> 8 );
      shiftOut(dataPin, clockPin, MSBFIRST, shift  + 164);
      digitalWrite(latchPin, HIGH);
      //delay(500);
      break;
    case 3:
      //3
      digitalWrite(latchPin, LOW);
      shiftOut(dataPin, clockPin, MSBFIRST, shift  >> 8 );
      shiftOut(dataPin, clockPin, MSBFIRST, shift  + 176);
      digitalWrite(latchPin, HIGH);
      //delay(500);
      break;
    case 4:
      //4
      digitalWrite(latchPin, LOW);
      shiftOut(dataPin, clockPin, MSBFIRST, shift  >> 8 );
      shiftOut(dataPin, clockPin, MSBFIRST, shift  + 153);
      digitalWrite(latchPin, HIGH);
      //delay(500);
      break;
    case 5:
      //5
      digitalWrite(latchPin, LOW);
      shiftOut(dataPin, clockPin, MSBFIRST, shift    >> 8 );
      shiftOut(dataPin, clockPin, MSBFIRST, shift  + 146);
      digitalWrite(latchPin, HIGH);
      //delay(500);
      break;
    case 6:
      //6
      digitalWrite(latchPin, LOW);
      shiftOut(dataPin, clockPin, MSBFIRST, shift    >> 8 );
      shiftOut(dataPin, clockPin, MSBFIRST, shift  + 130);
      digitalWrite(latchPin, HIGH);
      //delay(500);
      break;
    case 7:
      //7
      digitalWrite(latchPin, LOW);
      shiftOut(dataPin, clockPin, MSBFIRST, shift   >> 8 );
      shiftOut(dataPin, clockPin, MSBFIRST, shift  + 248);
      digitalWrite(latchPin, HIGH);
      //delay(500);
      break;
    case 8:
      //8
      digitalWrite(latchPin, LOW);
      shiftOut(dataPin, clockPin, MSBFIRST, shift   >> 8 );
      shiftOut(dataPin, clockPin, MSBFIRST, shift  + 128);
      digitalWrite(latchPin, HIGH);

      break;
    case 9:
      //9
      digitalWrite(latchPin, LOW);
      shiftOut(dataPin, clockPin, MSBFIRST, shift   >> 8 );
      shiftOut(dataPin, clockPin, MSBFIRST, shift  + 152);
      digitalWrite(latchPin, HIGH);
      break;
  }
  delay(times);
  //alarm section
  
  switch (units)
  {
    case 0:
    {
       digitalWrite(latchPin, LOW);
      shiftOut(dataPin, clockPin, MSBFIRST, 0B00100000 );
      shiftOut(dataPin, clockPin, MSBFIRST, 0B11000000);
      digitalWrite(latchPin, HIGH);
      break;
    }
   case 1:
    {
       digitalWrite(latchPin, LOW);
      shiftOut(dataPin, clockPin, MSBFIRST, 0B00100000 );
      shiftOut(dataPin, clockPin, MSBFIRST, 0B11111001);
      digitalWrite(latchPin, HIGH);
      break;
    }
    case 2:
    {
       digitalWrite(latchPin, LOW);
      shiftOut(dataPin, clockPin, MSBFIRST, 0B00100000 );
      shiftOut(dataPin, clockPin, MSBFIRST, 0B10100100);
      digitalWrite(latchPin, HIGH);
      break;
    }
    case 3:
    {
       digitalWrite(latchPin, LOW);
      shiftOut(dataPin, clockPin, MSBFIRST, 0B00100000 );
      shiftOut(dataPin, clockPin, MSBFIRST, 0B10110000);
      digitalWrite(latchPin, HIGH);
      break;
    }
    case 4:
    {
       digitalWrite(latchPin, LOW);
      shiftOut(dataPin, clockPin, MSBFIRST, 0B00100000 );
      shiftOut(dataPin, clockPin, MSBFIRST,0B10011001 );
      digitalWrite(latchPin, HIGH);
      break;
    }
    case 5:
    {
       digitalWrite(latchPin, LOW);
      shiftOut(dataPin, clockPin, MSBFIRST, 0B00100000 );
      shiftOut(dataPin, clockPin, MSBFIRST, 0B10010010);
      digitalWrite(latchPin, HIGH);
      break;
    }
    case 6:
    {
       digitalWrite(latchPin, LOW);
      shiftOut(dataPin, clockPin, MSBFIRST, 0B00100000 );
      shiftOut(dataPin, clockPin, MSBFIRST, 0B00000010);
      digitalWrite(latchPin, HIGH);
      break;
    }
    case 7:
    {
       digitalWrite(latchPin, LOW);
      shiftOut(dataPin, clockPin, MSBFIRST, 0B00100000 );
      shiftOut(dataPin, clockPin, MSBFIRST, 0B11111000);
      digitalWrite(latchPin, HIGH);
      break;
    }
    case 8:
    {
       digitalWrite(latchPin, LOW);
      shiftOut(dataPin, clockPin, MSBFIRST, 0B00100000 );
      shiftOut(dataPin, clockPin, MSBFIRST, 0B10000000);
      digitalWrite(latchPin, HIGH);
      break;
    }
    case 9:
    {
       digitalWrite(latchPin, LOW);
      shiftOut(dataPin, clockPin, MSBFIRST, 0B00100000 );
      shiftOut(dataPin, clockPin, MSBFIRST, 0B00010000);
      digitalWrite(latchPin, HIGH);
      break;
    }
  }
  delay(times);
  
  
     switch (tens)
  {
    case 0:
    {
       digitalWrite(latchPin, LOW);
      shiftOut(dataPin, clockPin, MSBFIRST, 0B00010000 );
      shiftOut(dataPin, clockPin, MSBFIRST, 0B11000000);
      digitalWrite(latchPin, HIGH);
      break;
    }
   case 1:
    {
       digitalWrite(latchPin, LOW);
      shiftOut(dataPin, clockPin, MSBFIRST, 0B00010000 );
      shiftOut(dataPin, clockPin, MSBFIRST, 0B11111001);
      digitalWrite(latchPin, HIGH);
      break;
    }
    case 2:
    {
       digitalWrite(latchPin, LOW);
      shiftOut(dataPin, clockPin, MSBFIRST, 0B00010000 );
      shiftOut(dataPin, clockPin, MSBFIRST, 0B10100100);
      digitalWrite(latchPin, HIGH);
      break;
    }
    case 3:
    {
       digitalWrite(latchPin, LOW);
      shiftOut(dataPin, clockPin, MSBFIRST, 0B00010000 );
      shiftOut(dataPin, clockPin, MSBFIRST, 0B10110000);
      digitalWrite(latchPin, HIGH);
      break;
    }
    case 4:
    {
       digitalWrite(latchPin, LOW);
      shiftOut(dataPin, clockPin, MSBFIRST, 0B00010000);
      shiftOut(dataPin, clockPin, MSBFIRST,0B10011001 );
      digitalWrite(latchPin, HIGH);
      break;
    }
    case 5:
    {
       digitalWrite(latchPin, LOW);
      shiftOut(dataPin, clockPin, MSBFIRST, 0B00010000 );
      shiftOut(dataPin, clockPin, MSBFIRST, 0B10010010);
      digitalWrite(latchPin, HIGH);
      break;
    }
    case 6:
    {
       digitalWrite(latchPin, LOW);
      shiftOut(dataPin, clockPin, MSBFIRST, 0B00010000 );
      shiftOut(dataPin, clockPin, MSBFIRST, 0B00000010);
      digitalWrite(latchPin, HIGH);
      break;
    }
    case 7:
    {
       digitalWrite(latchPin, LOW);
      shiftOut(dataPin, clockPin, MSBFIRST, 0B00010000 );
      shiftOut(dataPin, clockPin, MSBFIRST, 0B11111000);
      digitalWrite(latchPin, HIGH);
      break;
    }
    case 8:
    {
       digitalWrite(latchPin, LOW);
      shiftOut(dataPin, clockPin, MSBFIRST, 0B00010000 );
      shiftOut(dataPin, clockPin, MSBFIRST, 0B10000000);
      digitalWrite(latchPin, HIGH);
      break;
    }
    case 9:
    {
       digitalWrite(latchPin, LOW);
      shiftOut(dataPin, clockPin, MSBFIRST, 0B00010000 );
      shiftOut(dataPin, clockPin, MSBFIRST, 0B00010000);
      digitalWrite(latchPin, HIGH);
      break;
    }
  }
  if (HOUR == alarmHour && MINUT == alarmMinute)
  {
    digitalWrite(13, HIGH);
  }
  else
  {
    digitalWrite(13, LOW);
  }

}

Credits

Ramji Patel

26 projects • 18 followers

Myself Ramji Patel. I am an Engineering student and pursuing my B-Tech from Institute of engineering and rural Technology Prayagraj, India.

Arduino seven segment clock

Things used in this project

Hardware components

Software apps and online services

Story

about the project :-

DS1307 RTC :-

Shift register :-

seven segment display :-

Code :-

Success!

Author - Ramji Patel Jhansi

Schematics

Arduino 7 segment display

Code

Arduino 7segment clock code

Credits

Ramji Patel

Comments

Embed the widget on your own site

Arduino seven segment clock

Arduino seven segment clock

Things used in this project

Hardware components

Software apps and online services

Story

about the project :-

DS1307 RTC :-

Shift register :-

seven segment display :-

Code :-

Success!

Author - Ramji Patel Jhansi

Schematics

Arduino 7 segment display

Code

Arduino 7segment clock code

Credits

Ramji Patel

Comments

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