Published December 14, 2020 © MPL-2.0

First ever arduino digital watch without rtc module

Each time we make a watch using arduino to fetch time but I added some logic to arduino to accurately fetch time.

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First ever arduino digital watch without rtc module

Things used in this project

Hardware components

Arduino UNO

Alphanumeric LCD, 16 x 2

Rotary potentiometer (generic)

Solderless Breadboard Full Size

Jumper wires (generic)

Software apps and online services

Arduino IDE

fritzing

Hand tools and fabrication machines

Adafruit Soldering iron kit.

Story

Friends we have always used RTC module to fetch time but I tried my hands on this to make a watch without RTC module, I failed two times because two key reasons which were that arduino's processing speed which was causing wrong values for minutes when I wrote if seconds >59 minutes=minutes+1, and then when I wrote millis() function seconds were only increasing not decreasing to 0 when they became 60 or 24.

Then I was completely tired so I did the debugging part next day I added some functions which were so perfect that I was overjoyed and super excited ! because after all the testing it was working smoothly and with no bugs !

Watch the video and also like, share and subscribe if you liked it.

It was really tough for me to write code but still I will share the code with you if you found it helpful and if you made it successfully please share in comment box and slash the respect button as well so that my project becomes popular and more people can get ideas from my project.

Friends I forgot to tell you that you have to solder the lcd screen better output or else it may not work. If you see the code the watch will start from midnight time in IST so I have given instructions in code to change the minutes, hours, seconds according to your time.

Code

Code for the first ever watch without rtc.

//change the longest, middle and shortest value according to your time and then upload the code.

#include <LiquidCrystal.h>
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

//change the longest's value to change seconds.
int longest=0;

//change the middle's value to change minutes.
int middle=0;

//change the shortest's value to change hours.
int shortest=0;

void setup() {
  lcd.begin(16, 2);
  //Time here is displayed in IST.
  lcd.print("Time in IST -");
}

void loop() {
  if(longest<60){
    delay(1000);
    longest=longest+1;
  }
  else{
    longest=00;
  }
  
  if(longest>59){
    middle=middle+1;
  }
  else{
    middle=middle;
  }
  
  if(middle<60){
    middle=middle;
    shortest=shortest;
  }
  else{
    middle=0;
    shortest=shortest+1;
  }

  if(shortest<24){
    shortest=shortest;
  }
  else{
    shortest=0;
  }
    
  lcd.setCursor(0, 1);
  lcd.print(shortest);
  lcd.print(":");
  lcd.print(middle);
  lcd.print(":");
  lcd.print(longest);
  lcd.print("________");
  
}

Credits

akk47

7 projects • 9 followers

First ever arduino digital watch without rtc module

Things used in this project

Hardware components

Software apps and online services

Hand tools and fabrication machines

Story

Schematics

Scheamatics for watch without rtc

Code

Code for the first ever watch without rtc.

Credits

akk47

Comments

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First ever arduino digital watch without rtc module

First ever arduino digital watch without rtc module

Things used in this project

Hardware components

Software apps and online services

Hand tools and fabrication machines

Story

Schematics

Scheamatics for watch without rtc

Code

Code for the first ever watch without rtc.

Credits

akk47

Comments

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