Published December 4, 2022 © CC BY

7 Segment Led Clock

This is a simple seven segment clock using leds and controlled by an arduino

AdvancedFull instructions provided2 hours167

Things used in this project

Hardware components

LED (generic)

Arduino Micro

PHPoC Bread Board

Resistor 10k ohm

C&K Switches PTS 645 Series Switch

Flic Smart Button Flic 2: The Perfect Button

Software apps and online services

Arduino IDE

Hand tools and fabrication machines

Soldering iron (generic)

Solder Wire, Lead Free

Solder Flux, Soldering

Story

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Pcb Manufacturing

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4 layers

6 layers

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3d printing

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Parts Needed

Arduino nano

Leds

Board

Wires

Soldeing iron

Switch

Female Headers

The clock is made using arduino and other components as mentioned the files and all pictures are attached below

the control of the clock is done by arduino or you can use 74HC595 Drivers for easy control

In this case, I used it to simulate an analog clock without its hands, with very interesting results. The hours and minutes are placed around the center of matrix giving a familiar look of analog clocks. The code I have developed applies a little of trigonometry (sine and cosine) to calculate the coordinates of hours and minutes to be shown into LED matrix. With that I saved many lines of coding.

Every time you reset or restart the Arduino, the time mode will change.

The first four digits at left of display show the hours and minutes in decimal numbers. The next three digits show the hours, minutes and seconds in binary notation and the last digit at right inform the weekday.

About the code, I had to develop a way to use the "LedControl" library to turn conventional 7-Seg decimal display into a Binary display. The solution is to use "setRow" function that is usually applied for dot matrix display.

1 / 5

24-hour clock display need six seven segment displays. But for building digital clock we have to use only a single microcontroller. The problem we face is the lack of input pins on the microcontroller. In Arduino UNO it contain ATMEGA328p microcontroller which has 23 input pins only. Whereas for making clock we require six displays. As one display would take 8 pins and so three SSD would take 24 pins. For making the connections we have to use multiplexing all the seven segment displays.

The display should be such that SU will count from 0 to 9 for every second, ST will count 0 to 5 for every 10 seconds. Similarly, MU for every 60 seconds and for MT for every 10minutes. HU should also be same as SU and MU but for every 60 minutes and MT for every 10 hours. Keep in mind when the display shows 23:59:59 it should reset to 00:00:00 and again run. For making the digital clock first we need to execute the program for a single display to run decade counter in a seven segment displays The breadboard can be divided into 5 segments. In each of the green segments the pins are internally connected so as to have the same voltage. Similarly, in the central segments the pins in each column are internally connected in the same fashion as the blue columns

Code

Code

#include <TimeLib.h>
int digit1 = 10;
int digit2 = 11; 
int digit3 = 12; 
int digit4 = 13; 

int segA = 8;//Display pin A
int segB = 7;//splay pin b
int segC = 6; //Display pin c
int segD = 5; //Display pin d
int segE = 4; //Display pin e
int segF = 3; //Display pin f
int segG = 2; //Display pin g
int segDP = 9;// Display pin dot

byte SW0 = A0;
byte SW1 = A1;
byte SW2 = A2;

void setup() {

  pinMode(segA, OUTPUT);
  pinMode(segB, OUTPUT);
  pinMode(segC, OUTPUT);
  pinMode(segD, OUTPUT);
  pinMode(segE, OUTPUT);
  pinMode(segF, OUTPUT);
  pinMode(segG, OUTPUT);
  pinMode(segDP, OUTPUT);

  pinMode(digit1, OUTPUT);
  pinMode(digit2, OUTPUT);
  pinMode(digit3, OUTPUT);
  pinMode(digit4, OUTPUT);

 Serial.begin(9600);

  pinMode(SW0, INPUT);  
  pinMode(SW1, INPUT);  
  pinMode(SW2, INPUT);  

  digitalWrite(SW0, HIGH); 
  digitalWrite(SW1, HIGH);
  digitalWrite(SW2, HIGH);
}

void loop() {
   digitalWrite(segDP, HIGH);
   int hr = hour();
  int timp = ( (hr>12)?(hr%12):hr)*100+minute();
  Serial.println(timp);
  
   for(int i = 250 ; i >0  ; i--) {
     if (timp > 100) displayNumber01(timp);
     else displayNumber02(timp);
   }

   for(int i = 250 ; i >0  ; i--) {
     if (timp > 100) displayNumber03(timp);
     else displayNumber04(timp);
   }

  if (!(digitalRead(SW0))) set_time();
}

void set_time()   {
  byte minutes1 = 0;
  byte hours1 = 0;
  byte minutes = minute();
  byte hours = hour();

  while (!digitalRead(SW0)) 
  {
    minutes1=minutes;
    hours1=hours;

  while (!digitalRead(SW1)) 
    {
     minutes++;

    if (minutes > 59) minutes = 0;
     for(int i = 20 ; i >0  ; i--) {
       int timp= hours*100+minutes;
     if (timp > 1000) displayNumber01(timp);
     else displayNumber02(timp);
     }

   delay(150);
    }

    while (!digitalRead(SW2))
    {
     hours++;

     if (hours > 12) hours = 0;

     for(int i = 20 ; i >0  ; i--) {
     int timp= hours*100+minutes;
     if (timp > 1000) displayNumber01(timp);
     else displayNumber02(timp);
     }

     delay(150);
    }

     for(int i = 20 ; i >0  ; i--) {
     displayNumber01(hours*100+minutes);
     }
     setTime(hours,minutes,0,0,0,0);
   delay(150);

  }

}

void displayNumber01(int toDisplay) {
#define DISPLAY_BRIGHTNESS  500

#define DIGIT_ON  HIGH
#define DIGIT_OFF  LOW

  for(int digit = 4 ; digit > 0 ; digit--) {

  
    switch(digit) {
    case 1:
     digitalWrite(digit1, DIGIT_ON);
     digitalWrite(segDP, LOW);
      break;
   case 2:
      digitalWrite(digit2, DIGIT_ON);
      digitalWrite(segDP, LOW);
      break;
    case 3:
      digitalWrite(digit3, DIGIT_ON);
      digitalWrite(segDP, LOW);
      break;
    case 4:
      digitalWrite(digit4, DIGIT_ON);
      digitalWrite(segDP, LOW);
      break;
    }
    lightNumber(toDisplay % 10);
    toDisplay /= 10;
    delayMicroseconds(DISPLAY_BRIGHTNESS);

  
    lightNumber(10);

    
    digitalWrite(digit1, DIGIT_OFF);
    digitalWrite(digit2, DIGIT_OFF);
    digitalWrite(digit3, DIGIT_OFF);
    digitalWrite(digit4, DIGIT_OFF);
}
}

void displayNumber02(int toDisplay) {
#define DISPLAY_BRIGHTNESS  500

#define DIGIT_ON  HIGH
#define DIGIT_OFF  LOW

  for(int digit = 4 ; digit > 0 ; digit--) {

   
    switch(digit) {
    case 1:
     lightNumber(10);
     digitalWrite(segDP, LOW);
     break;
   case 2:
      digitalWrite(digit2, DIGIT_ON);
      digitalWrite(segDP, LOW);
      break;
    case 3:
      digitalWrite(digit3, DIGIT_ON);
      digitalWrite(segDP, LOW);
      break;
    case 4:
      digitalWrite(digit4, DIGIT_ON);
      digitalWrite(segDP, LOW);
      break;
    }
    lightNumber(toDisplay % 10);
    toDisplay /= 10;
    delayMicroseconds(DISPLAY_BRIGHTNESS);

    
    lightNumber(10);

    
    digitalWrite(digit1, DIGIT_OFF);
    digitalWrite(digit2, DIGIT_OFF);
    digitalWrite(digit3, DIGIT_OFF);
    digitalWrite(digit4, DIGIT_OFF);
}
}

void displayNumber03(int toDisplay) {
#define DISPLAY_BRIGHTNESS  500

#define DIGIT_ON  HIGH
#define DIGIT_OFF  LOW

  for(int digit = 4 ; digit > 0 ; digit--) {

    
    switch(digit) {
    case 1:
     digitalWrite(digit1, DIGIT_ON);
     digitalWrite(segDP, HIGH);
      break;
   case 2:
      digitalWrite(digit2, DIGIT_ON);
      digitalWrite(segDP, HIGH);
      break;
    case 3:
      digitalWrite(digit3, DIGIT_ON);
      digitalWrite(segDP, HIGH);
      break;
    case 4:
      digitalWrite(digit4, DIGIT_ON);
      digitalWrite(segDP, HIGH);
      break;
    }
    lightNumber(toDisplay % 10);
    toDisplay /= 10;
    delayMicroseconds(DISPLAY_BRIGHTNESS);

    
    lightNumber(10);

   
    digitalWrite(digit1, DIGIT_OFF);
    digitalWrite(digit2, DIGIT_OFF);
    digitalWrite(digit3, DIGIT_OFF);
    digitalWrite(digit4, DIGIT_OFF);
}
}

void displayNumber04(int toDisplay) {
#define DISPLAY_BRIGHTNESS  500

#define DIGIT_ON  HIGH
#define DIGIT_OFF  LOW

  for(int digit = 4 ; digit > 0 ; digit--) {

    
    switch(digit) {
    case 1:
     lightNumber(10);
     digitalWrite(segDP, HIGH);
     break;
   case 2:
      digitalWrite(digit2, DIGIT_ON);
      digitalWrite(segDP, HIGH);
      break;
    case 3:
      digitalWrite(digit3, DIGIT_ON);
      digitalWrite(segDP, HIGH);
      break;
    case 4:
      digitalWrite(digit4, DIGIT_ON);
      digitalWrite(segDP, HIGH);
      break;
    }
    lightNumber(toDisplay % 10);
    toDisplay /= 10;
    delayMicroseconds(DISPLAY_BRIGHTNESS);

    lightNumber(10);

    digitalWrite(digit1, DIGIT_OFF);
    digitalWrite(digit2, DIGIT_OFF);
    digitalWrite(digit3, DIGIT_OFF);
    digitalWrite(digit4, DIGIT_OFF);
}
}

void lightNumber(int numberToDisplay) {

#define SEGMENT_ON  LOW
#define SEGMENT_OFF HIGH

  switch (numberToDisplay){

  case 0:
    digitalWrite(segA, SEGMENT_ON);
    digitalWrite(segB, SEGMENT_ON);
    digitalWrite(segC, SEGMENT_ON);
    digitalWrite(segD, SEGMENT_ON);
    digitalWrite(segE, SEGMENT_ON);
    digitalWrite(segF, SEGMENT_ON);
    digitalWrite(segG, SEGMENT_OFF);
    break;

  case 1:
    digitalWrite(segA, SEGMENT_OFF);
    digitalWrite(segB, SEGMENT_ON);
    digitalWrite(segC, SEGMENT_ON);
    digitalWrite(segD, SEGMENT_OFF);
    digitalWrite(segE, SEGMENT_OFF);
    digitalWrite(segF, SEGMENT_OFF);
    digitalWrite(segG, SEGMENT_OFF);
    break;

  case 2:
    digitalWrite(segA, SEGMENT_ON);
    digitalWrite(segB, SEGMENT_ON);
    digitalWrite(segC, SEGMENT_OFF);
    digitalWrite(segD, SEGMENT_ON);
    digitalWrite(segE, SEGMENT_ON);
    digitalWrite(segF, SEGMENT_OFF);
    digitalWrite(segG, SEGMENT_ON);
    break;

  case 3:
    digitalWrite(segA, SEGMENT_ON);
    digitalWrite(segB, SEGMENT_ON);
    digitalWrite(segC, SEGMENT_ON);
    digitalWrite(segD, SEGMENT_ON);
    digitalWrite(segE, SEGMENT_OFF);
    digitalWrite(segF, SEGMENT_OFF);
    digitalWrite(segG, SEGMENT_ON);
    break;

  case 4:
    digitalWrite(segA, SEGMENT_OFF);
    digitalWrite(segB, SEGMENT_ON);
    digitalWrite(segC, SEGMENT_ON);
    digitalWrite(segD, SEGMENT_OFF);
    digitalWrite(segE, SEGMENT_OFF);
    digitalWrite(segF, SEGMENT_ON);
    digitalWrite(segG, SEGMENT_ON);
    break;

  case 5:
    digitalWrite(segA, SEGMENT_ON);
    digitalWrite(segB, SEGMENT_OFF);
    digitalWrite(segC, SEGMENT_ON);
    digitalWrite(segD, SEGMENT_ON);
    digitalWrite(segE, SEGMENT_OFF);
    digitalWrite(segF, SEGMENT_ON);
    digitalWrite(segG, SEGMENT_ON);
    break;

  case 6:
    digitalWrite(segA, SEGMENT_ON);
    digitalWrite(segB, SEGMENT_OFF);
    digitalWrite(segC, SEGMENT_ON);
    digitalWrite(segD, SEGMENT_ON);
    digitalWrite(segE, SEGMENT_ON);
    digitalWrite(segF, SEGMENT_ON);
    digitalWrite(segG, SEGMENT_ON);
    break;

  case 7:
    digitalWrite(segA, SEGMENT_ON);
    digitalWrite(segB, SEGMENT_ON);
    digitalWrite(segC, SEGMENT_ON);
    digitalWrite(segD, SEGMENT_OFF);
    digitalWrite(segE, SEGMENT_OFF);
    digitalWrite(segF, SEGMENT_OFF);
    digitalWrite(segG, SEGMENT_OFF);
    break;

  case 8:
    digitalWrite(segA, SEGMENT_ON);
    digitalWrite(segB, SEGMENT_ON);
    digitalWrite(segC, SEGMENT_ON);
    digitalWrite(segD, SEGMENT_ON);
    digitalWrite(segE, SEGMENT_ON);
    digitalWrite(segF, SEGMENT_ON);
    digitalWrite(segG, SEGMENT_ON);
    break;

  case 9:
    digitalWrite(segA, SEGMENT_ON);
    digitalWrite(segB, SEGMENT_ON);
    digitalWrite(segC, SEGMENT_ON);
    digitalWrite(segD, SEGMENT_ON);
    digitalWrite(segE, SEGMENT_OFF);
    digitalWrite(segF, SEGMENT_ON);
    digitalWrite(segG, SEGMENT_ON);
    break;

  
  case 10:
    digitalWrite(segA, SEGMENT_OFF);
    digitalWrite(segB, SEGMENT_OFF);
    digitalWrite(segC, SEGMENT_OFF);
    digitalWrite(segD, SEGMENT_OFF);
    digitalWrite(segE, SEGMENT_OFF);
    digitalWrite(segF, SEGMENT_OFF);
    digitalWrite(segG, SEGMENT_OFF);
    break;

  }
}

7 Segment Led Clock

Things used in this project

Hardware components

Software apps and online services

Hand tools and fabrication machines

Story

Pcb Manufacturing

----------

2 layers

4 layers

6 layers

PCBA Services

3d printing

-------------------

Parts Needed

Arduino nano

Leds

Board

Wires

Soldeing iron

Switch

Female Headers

Every time you reset or restart the Arduino, the time mode will change.

Schematics

Schematics

Code

Code

Credits

the_electro_artist

Comments

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7 Segment Led Clock

7 Segment Led Clock

Things used in this project

Hardware components

Software apps and online services

Hand tools and fabrication machines

Story

Pcb Manufacturing

----------

2 layers

4 layers

6 layers

PCBA Services

3d printing

-------------------

Parts Needed

Arduino nano

Leds

Board

Wires

Soldeing iron

Switch

Female Headers

Every time you reset or restart the Arduino, the time mode will change.

Schematics

Schematics

Code

Code

Credits

the_electro_artist

Comments

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