8 digit 7 segment display

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there appears 2 different ways of sending data above display.

are there examples of both systems somewhere on how send data input display including how store data.

seems there example matrix systems , can find related generating number several times or counting , displaying.

use spi.
see:
http://forum.arduino.cc/index.php?topic=248078.0

http://www.gammon.com.au/forum/?id=11516

also 7 segment library.


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