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** https://note.com/solder_state/n/nde97a0516f03 and https://www.youtube.com/watch?v=op_DhPr2goc ** arduino nano (other options probably fine), two 74HC595 shift registers (accidentally a pile in my collection) and the output jacks bottom_row = v_margin + 12; row_1 = vertical_space/7; row_2 .

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