Part of the readme reads :
These displays are powered directly through the Arduino output pins.
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COMMON_CATHODE - For common cathode displays without switches. These displays require a low voltage at the digit pin to illuminate the digit.
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COMMON_ANODE - For common anode displays without switches. These displays require a high voltage at the digit pin to illuminate the digit.
This is the wrong way round. A common cathode requires a high voltage at the pin, and low for a common anode.
Part of the readme reads :
This is the wrong way round. A common cathode requires a high voltage at the pin, and low for a common anode.