7-segment display with shift register. Common anode/cathode, any (eh, sort of) number of digits. Kind of framebuffer. Display has to be connected thru shift register, e.g. 4094. More details and picture in header file.

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LED7segmDual4094.cpp 6280 Revisions Annotate
LED7segmDual4094.h 2143 Revisions Annotate