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Replying to @abetusk

Here it is! I cleaned up the main script eventually — I can dig up that version if you want it — but the most useful thing here is at the bottom of the page: a patch to the Adafruit ht16k33 library that makes it work with the 8-digit modules. https://gist.github.com/joeycastillo/a2ef23566188c3e1bce9268421a7794d

(original)