“Here’s a simple guide on how to create your own count down timer. The purpose of this guide is to get familiar with IR receiver, LCD, active buzzer, potentiometer and LED. This design uses the Arduino UNO R3 board, but any of the Arduino boards with at least 7 digital i/o pins and 1 analog pin would be fine. This timer that you are going to build will count down the time you input in seconds. Once the time reaches 0, the LED lights up and buzzer will sound off. It continues to react until reset by remote or manually resetting the Arduino.”