How to Make Arduino Clock using 7-Segment Display

Hello, welcome back with another interesting Arduino Uno project is here. The Arduino Clock, You can easily build an Arduino clock using few components. The brain of this project is ATMEGA 328P programming IC. So we are going to programming this IC and use it as a fantastic Arduino based Digital clock.

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Contents

Components Required

Arduino Uno or Programmed ATMEGA 328 IC
16 Mhz crystal
22pf ceramic capacitor
Push button
7805 Regulator IC
LED
Common Anode 7-Segment Display
10K, 330 R resistors
9v or 12v Battery

4 Bit Seven Segment Connection for Arduino Clock

First you need to build a 4 bit seven segment display by connecting all pins as per the circuit diagram given in the schematics given in below. The seven segment display is common anode type. So if you are buying this display please confirm it first. Pin A, B, C, D E, F, G are represented in the image for connection. The numbering from 1 to 4 is powering the 7 segment display. Those pins are goes to the arduino uno or ATMEGA328P IC pins. Buy 7 segment common anode display

4 bit seven segment display connection — 4-Bit Seven Segment Display Connection

Arduino Clock Circuit Diagram

The Arduino clock works with 12Hrs setup mode. Their is two push switch is available in the circuit diagram. The push switch is act as the control of adjusting the time on the display. By pressing these switch you can easily change the numbers on the display. Buy ATMEGA328P with pre Bootloader Installed

A 9v battery connected with the circuit diagram, You can replace this battery with 12v battery without any issues. The 7805 regulator IC provides only 5V to the microcontroller and also the seven segment display, so their is no worries about over voltage or any voltage fluctuation in the external power source.

Arduino Clock Programming Code

//*** Solderingmind.com ***

#include "SevSeg.h"
 SevSeg Display;  
 const unsigned long period = 1000;  
 const unsigned long led_period = 500;  
 unsigned long startMillis;  
 unsigned long led_startMillis;  
 unsigned long currentMillis;  
 unsigned long led_currentMillis;  
 
 const int hrs_btn = A5;  
 const int min_btn = A4;  
 const int ledPin = 13;  
 
 int Hrs = 12;  
 int Min = 0;  
 int Sec = 0;  
 int Time;  
 int ledState = LOW;  
 void setup()  
 {  
 pinMode(hrs_btn, INPUT_PULLUP);  
 pinMode(min_btn, INPUT_PULLUP);  
 pinMode(ledPin, OUTPUT);  
 byte numDigits = 4;  
 
 byte digitPins[] = {A3,A2,A1,A0};  
 byte segmentPins[] = {2,3,4,5,6,7,8};  
 
 bool resistorsOnSegments = true;  
 bool updateWithDelaysIn = true;  
  
 byte hardwareConfig = COMMON_ANODE;
   
 Display.begin(hardwareConfig, numDigits, digitPins, segmentPins, resistorsOnSegments);  
 Display.setBrightness(100);  
 }  
 void loop()  
 {  
 currentMillis = millis();  
 if (currentMillis - startMillis >= period)  
 {  
 Sec = Sec + 1;  
 startMillis = currentMillis;  
 }  
 led_currentMillis = millis();  
 if (led_currentMillis - led_startMillis >= led_period)  
 {  
 led_startMillis = led_currentMillis;  
 if (ledState == LOW)  
 {  
 ledState = HIGH;  
 if (digitalRead(hrs_btn) == LOW)  
 {  
 Hrs = Hrs + 1;  
 }  
 if (digitalRead(min_btn) == LOW)  
 {  
 Min = Min + 1;  
 Sec = 0;  
 }  
 }  
 else  
 {  
 ledState = LOW;  
 }  
 digitalWrite(ledPin, ledState);  
 }  
 if (Sec == 60)  
 {  
 Sec = 0;  
 Min = Min + 1;  
 }  
 if (Min == 60)  
 {  
 Min = 0;  
 Hrs = Hrs + 1;  
 }  
 if (Hrs == 13)  
 {  
 Hrs = 1;  
 }  
 Time = Hrs * 100 + Min;  
 Display.setNumber(Time);  
 Display.refreshDisplay();  
 }