This chip can easily — and cheaply — control eight common cathode seven segment displays. There’s a problem with this plan, though: the LEDs received from eBay are common anode.

Here, a common cathode 7-segment LED display is connected to Arduino for displaying the digits. The code (Arduino sketch) allows push button increment of the counter from 0 to 9. The whole circuit can ...

The module used here is a self-contained, compact common-cathode module containing four 7-segment LED numeric displays. Each segment in the display module is multiplexed, meaning it shares the same ...