The type of clock you can make with an Arduino as the brains is only limited by your imagination - and a fine example has been described by Instructables user "kaustubhv". Embedded in a circular piece of artwork, there's a normal four-digit digital clock and a ring of LEDs around the circumference of the clock. Then various effects can be generated to indicate the time, seconds and so on. All the LEDs are driven via Charlieplexing to save circuitry - and all the design details are supplied so you can recreate your own. To get you started, here's the clock in action:
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This is the same Atmel AVR ATmega328P microcontroller used in the official Arduino Uno, as well as our Eleven, EtherTen, USBDroid, and other boards. Perfect for building your own Arduino-compatible project directly on a breadboard or on a custom PCB, or for replacing the MCU in an existing board. Comes with the Arduino Uno bootloader pre-installed. Better still, it even has a special label stuck on top with details of the pinout, so you don't even need to look up the datasheet when connecting it up in your project! For more information and to order, click here!