Countdown timer using Arduino, LCD 16x2 i2c & 4x3 Keypad, Arduino countdown Timer Millis

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Project Description:
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In today’s episode, you will learn how to make an advanced level Countdown timer based on the Arduino, 16x2 i2c LCD, 4x3 matrix keypad, and a one channel relay module. With the help of this Countdown timer, you can control different types of electrical loads like for example Light Bulbs, Heaters, Water Pumps, Washing Machines, Fans, etc. in fact, this countdown timer can be used anywhere where you need to control anything on the time basis.

As you can see, for the demonstration purposes, I have connected a 220Vac light bulb, which of course can be replaced with different types of other electrical loads. This countdown timer is very user-friendly. Let’s say I want to turn ON this Bulb for 10 seconds…Enter minutes as 0 and press the Asterisk key on the keypad… now, enter seconds and again press the asterisk key… as you can see the light Bulb has been turned ON. Now, this Bulb will remain ON for 10 seconds…As you can see the light just turned OFF… Now let’s say I want to Turn ON this light for 1 minute and 25 seconds, simply enter the minutes and seconds, and that’s it…

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Arduino Nano USB-C Type ( recommended):

ESP32 WiFi + Bluetooth Module for iOT Projects (recommended), more IO pins, improved speed, and supports a Lipo Battery:

LCD 16x2 i2c:

4x3 Keypad Arduino:

One-Channel Relay Module:

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DISCLAIMER: This video and description contain affiliate links, which means that if you click on one of the product links, I will receive a small commission. This helps support the channel and allows me to continue to make videos like this. Thank you for your support!
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[حسنينطه-ذض]

thank you so much .. i used your code in my project and it works perfectly

[davem]

Superb write up, is there any way of changing into days and hours instead of mins and seconds ??

[kimjushuasalon]

Can you make 3 Bulb control for different timer?

[vishnuk.b]

How to do the same with fixed timings such as 5 min, 15 min, 30 min and 45 min, by using 1x4 keypad and by trigerring the external push switch to start, pause and clear ?

[ulrichgrobbelaar]

Hi there, I'm running into a problem. I'm using my code where I use a delay. After every second the code subtracts one and displays it on the LCD. It counts down perfectly, but when it reaches the single didgets (9, 8, 7, 6, 5, 4, 3, 2, 1) it displays (90, 80, 70, 60, 50, 40, 30, 20, 10). I believe it's a simple offset.

[infotechpkk]

How can i use 4*4 Keypad, Actually i Have no 4*3 Keypad 😞

[net]

congratulations for the project!
I was wondering if it is possible to integrate the blink without delay example sketch into your code instead of switching on the lamp

[shalongjohn]

Sir, Can you please upload the detailed video of hardware connection of this project?

[midhunr]

Can u add pause resume feature in this code

[tonyvarghese]

Sir how add buzzer after count down stops

[adrian]

Please provide link to download coding arduino ide, I want to make that project

[tonyvarghese]

Please give the link for downloading libraries for keypad and lcd

[rakeshgupta-nhhu]

How to control with matrix keypad LCD display, like press 1 -came - Kerala press 2 came Mumbai many more state name comes after press only number

[tonyvarghese]

Button type keypad pinout is same as membrane type keypad

[Deckardrick]

This is way out of my league. Do you accept commissions? Serious inquiry

[TON-vzpe]

Hi, Do you have an email ID ? I would like to buy from you.