I constructed this a week or two ago, but only just now got a chance to photograph it with a real camera. This represents the first theoretically useful circuit I built with the Arduino platform. It utilizes the 7 segment decoding program along with a real time clock (RTC), blinking out the time one digit at a time. The RTC speaks a serial protocol called I2C so only two pins on the microcontroller are needed to read the time.
This is part of a project I’ll be building on soon, but it’s mostly still in the proof-of-concept phase.