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Thanks for the feedback. I found that Adafruit has backpacks that are specifically for the 4 digit 7 segment LED displays using 4 pins. The link is http://www.adafruit.com/products/881 . She has the same backpack with 4 colors.I'm not aware of a "backpack" for 7 segment LED displays. But you can easily use a shift register to drive the displays. This will cost you 3 pins on the Netduino, but gains you a virtually limitless number of pins. You can either use 4 8 bit shift registers like the ever popular 74xx595, or two 16 bit shift registers like the 74xx676. They do have 32 bit shift registers, but I can only seem to find them in surface mount.
-dan
The pinouts are ... I2C for the SCL, SDA and it also uses VCC and GND. There is some example code and libraries for the Arduino; but, conversion to C# is a job that I am not yet up to.
I guess unless someone can let me know how to use the Arduino code, I'll have to use the 16 bit shift registers.
Thanks again
