how many 7 segment LEDs can a arduino run?

Forum 2005-2010 (read only) General Frequently-Asked Questions
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I don't know if size/brightness does matter:
But if you want to show just much numbers, maybe an LCD 2x16 is more suitable?
For the 3x13$ you get a nice LCD. For an LCD you normally need 6 digipins, no matter of coulumn and row of the LCD.