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Choose a good quality LEDs. I had a bad experience with cheep LED imported from china through ebay. They stopped working after few months.As you can see it is very hard to replace them from the display board
Unfortunately i don't have the circuit diagram for this, for wiring from arduino to display board you can refer the arduino sketch file. these may be helpfulhttp://playground.arduino.cc/Main/MAX72XXHardware
yes, as the digit size is over 2 inches it is easy to read from long distance.
Arduino MAX7219 Real Time C...View Instructable »
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