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  • Yes, I think it's just execution speed. Not using constants (use 1, not high) and stuff like that helps... As does minimising whitespace! Just stick that function in a minifier and see if it helps :)

    Unravelling updateRow would just reduce the overhead of executing functions and checking for the next thing to execute - I think it might help a bit.

    For 5v, can't you just use the jumper that powers the 5v like from VBat, and then power off USB? That should help a lot - and I don't think you should need any resistors?


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