[Dushyant] debugged the clock with a regular Arduino, but when it came time to finish the project, he used an ATmega328 to create an Arduino compatible board from scratch.

[John] at tronixstuff had a different idea and set out to test the internal EEPROM of an ATmega328. [John]’s build is just an Arduino and LCD shield that writes the number 170 to memory on one ...

Watch this video on YouTube. “The Arduino Nano is a small, complete, and breadboard-friendly board based on the ATmega328 (Arduino Nano 3.x).