They have provided me with some other information about these signs. I'd like to report that, as of May 21, , the official software download on Digoo's website downloads an empty. And once I've done all that it's just more PC side scripting. A circuit supplies current for a row at a time and ground connections, or current sinks, determine which LEDs turn on for each row. Pinouts for LED-matrix modules vary somewhat by manufacturer.
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