This new product is simple but very useful. The Digit Shield lets you easily add four 7-segment displays to your Arduino. You may have seen a similar shield in the past, but this one is less that half the cost
(only $22.95), open source, and very easy to use because I provided a library with a simple API.
All the details are at http://nootropicdesign.com/digitshield/
+ An easy-to-use open source library makes it very simple to display integers and floating point numbers.
+ Multiplexing of digits is implemented using a timer overflow interrupt handler for flicker-free display.
+ Only uses 4 Arduino pins (2,3,4,5).
+ All through-hole parts for easy kit assembly. Also available fully assembled/tested.
+ Available in two display colors: cool, crisp green or blazing red-orange!shieldlist.org
offers a bounty (a Freetronics protoshield) for newly-reported shields. I have not reported this new shield because I wanted to give someone else a chance to collect the bounty. Who will report it first?