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Nice work! Do you foresee any problems finding pens for it?
I was referring more to support your decision of going with 100 strips of 40 vs 40 strips of 100. You could still update 8 rows (groups of 8 * 100 = 800 LEDs) on each data line but your frame rate would be lower since the strip will not update until the data for ALL the LEDs in the strip has been sent. Shorter strips allow a higher frame rate. I wasn't implying to use 100 GPIO pins! I'm sure you get this but it might not be obvious to other readers.
It should be noted that the time to update a line of 100 LEDs would be 2.5 times as long as updating a line of 40 LEDs which would significantly reduce your frame rate.
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Nice & clean looking result. Suggestion for the AC connection: The AC plug on the Apple adapter can slide off and exposes another connector into the adapter. This looks like an IEC C7 plug would fit in. You could use the smaller C7 plug to replace the extension cord segment (that you didn't use) and then plug right into the adapter.
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