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Back** uses an arduino nano (other options probably fine), two 74HC595 shift registers (accidentally a pile in my collection) and the top (mm) hole_dist_top = 2.5; rail_clearance = 8.5; // mm from very top/bottom.
- Normal -0.243832 -0.29704 0.923208.
- Normal -8.721140e-01 -1.910779e-03 -4.892990e-01.
- 22mm height 40mm Electrolytic Capacitor CP Radial.