apolodies if duplicate post - searched "16 x 7-segment display" got nothing :-)
does arduino mega, pins, allow multiplexing of 16 x 7 segment displays without having use shift register?
this job (at first, anyway...)
as see it, need 8 outputs leds in displays, 16 more common cathode/anodes displays.
that mean 24 outputs - mega has 54 i/o pins, seem enough. every tutorial see online has board using shift registers drive displays - programming issue, or tutorials waht teach use of shift registers?
so, use mega drive 16 x 7 (or
segment displays?
thanks,
roger.
does arduino mega, pins, allow multiplexing of 16 x 7 segment displays without having use shift register?
this job (at first, anyway...)
as see it, need 8 outputs leds in displays, 16 more common cathode/anodes displays.
that mean 24 outputs - mega has 54 i/o pins, seem enough. every tutorial see online has board using shift registers drive displays - programming issue, or tutorials waht teach use of shift registers?
so, use mega drive 16 x 7 (or
segment displays?thanks,
roger.
you need 2 max7219s.
(it not matter whether displays common anode or common cathode; programming easier common cathode.)
doing other way involves ridiculous amount of mucking transistors achieve reasonable driving current. simple that.
(it not matter whether displays common anode or common cathode; programming easier common cathode.)
doing other way involves ridiculous amount of mucking transistors achieve reasonable driving current. simple that.
Arduino Forum > Using Arduino > LEDs and Multiplexing > Can I drive 16 x 7-segment (or 8 with DP) displays, with no shift register?
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