Recently, we published an entry-level Arduino project with a single seven-segment LED display ... the same anode connection points. And each of the four digits in the module have their own common ...

The following idea reuses one ofthese approaches to drive a maximumnumber of seven-segment LED displays,and it may be useful in designing a lowcomponent-count, low-power, and lowcostLED-display module ...

A while back, [limpfish] bought a few four-digit ... eight common cathode seven segment displays. There’s a problem with this plan, though: the LEDs received from eBay are common anode.