RFID Alarm Clock using Mega 2560

This post teaches you how to implement a very interesting Alarm Clock using the RFID module, IR module, 4-digit 7-segment display, Arduino Mega 2560, and a Passive Buzzer. The project video has a complete implementation right from component details, to connections and wiring, boxing as a stand-alone clock to the code explanation. ⏰ Github Project Code Link.

The Working

1. The IR module is used to set the number of hours you wish to sleep. The total time is set on the 7-segment 4 digit display.
2. The display initially begins with 4 dashes ( — —: — — ). As you set the time using the IR remote, you can see the numbers being displayed one by one. Presently the code is set for Mins: Secs format, but it can easily be changed for Hrs: Mins format, as explained in the project video as well as the code.
3. Once the time is set, the countdown timer starts and you can peacefully go to sleep. 😴 The timer is continuously displayed on the segment display. This helps when you get up in the middle of the night and wish to know how many hours you still have left to sleep. We know how much that few extra mins count. 😉
4. As soon as the timer reaches 0, the passive buzzer starts playing the set tone. In the project implementation, it’s the Mario song, which can also be changed. 🎵