Arduino Based Countdown Timer | Without RTC | Arduino Project

In this project, we will build a simple countdown timer using Arduino without the need for a Real-Time Clock (RTC) module. The timer can be customized for different time durations and controlled through buttons or a keypad. The project showcases how you can utilize the internal timer of the Arduino to keep track of time, making it a cost-effective solution.

Component List
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Arduino Nano Board
16x2 LCD Display
10k Resister
Push Button
Buzzer
5v 1 Channel relay Module
230v LED Blub
Zero PCB
Wire
USB Cable
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Project Buy Link
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Full Working Project :-
📱Number:- [phone]
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Time Stamps
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[therealncer]

This is excellent and exactly what I have been trying to create. I have an issue though as when I push the start button the timer doesnt count down. I can no longer adjust the time or change the ss, mm or hh though it simply doesnt count down. I have tried for hours to fix this with no luck so if you have any ideas please let me know. Thank you.

[qurrotateknologi]

THIS PROJECT WAS WHAT I WAS LOOKING FOR SINCE I WAS 10, AND I WAS THINKING OF MAKING A SIMPLE BOMB

[TON-vzpe]

This works like a charm. But is this timer accurate ? Will it work properly for an hour ?. Just asking. All other videos on this topic are too much scrap and complex. Sometime the code doesn't fit for all models. But this is good.

[AeroRcBoullosa]

Gracias, funcione perfectamente y muy bien, lo adaptare a mi proyecto de Reloj Temporizador de cocina

[asadulhuq]

While the project is 2 years old till today I am very much interested about this project. The project is really very interesting. Just one thing remains unsolved to me. Can you please give me a link where I may get the include file "Countiner.h"? Thanks.

[BrownToiletIsh]

Can I use any kind of LCD here? Also, can you please help me to find a similar lcd like this? But mine has to be JHD162a, 659m10, and the rohs must be 1930

[sp_service]

in this video which ardunio design software is used for simulation and making design online for this project...plz mention software name

[arduinorobotics]

And which circuit maker software u used?

[ricardopaz]

Good afternoon, you have it with a 4-digit 7-segment display
Thank you

[divyanshsao]

Can we loop/ restart input time delay with 5 sec rest

[akash]

Sir, how to program
After one hour auto Start for 6 second

[umiturgutaswwsa]

Can you make a video to present the codes?I want to understand it.

[toksgagik]

where the code for the timer works, I do not have anything showing on the LCD. any thought where to look for my error? The LCD Pot seems to adjust contrast as well. since i am newer, i may be missing something obvious.

[ledc]

Thanks, Please make a StopWatch timer.

[ederparolezi]

Thank you very much, it's been very useful

[rushabhpatel]

Can you please help me with code for countdown timer with timing resolution up to 1 millisecond?

[chunz]

what if i have sensors? the code doesnt work,

[arnabkaran]

Pease give me library for #include "Countimer.h" sir!

[arduinorobotics]

Bhai apke pass toh bhaiut components hai

[rushisuryawanshi]

Bhai wo countimer.h library kaise install kar