A timer is a form of clock usually used to measure time intervals. There are two types of timers, one that counts up from zero to measure elapsed time, called a stopwatch. While the second type of timer counts down from a specified duration provided by the user, it is commonly referred to as a countdown timer.
In this tutorial, we will show you how to make a countdown timer using an Arduino board. In this article, we are not using any real time clock (RTC) module to get the time. The duration is set by the user via the keypad and the 1602's LCD. When the timer resets to zero, an alarm will sound through the buzzer.
required materials
● Arduino UNO development board
● LCD display module 1602
● 4*4 matrix keyboard
● Buzzer
● button
● Potentiometer (10k)
● Resistance (10k, 100 ohms)
● connecting leads
circuit schematic
Here, the Arduino Uno is used as the main controller. The duration is set using the keyboard, and the LCD display module 1602 displays the countdown. The button is used to start the timer. For how to connect the Arduino board with the 4x4 matrix keyboard, please refer to: https://www.yiboard.com/thread-780-1-1.html .
For more information, please refer to the following link: https://www.yiboard.com/thread-812-1-1.html