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X="4.4" y="2.3"/> - 2 5mm LEDs - one per step // 1 rotary switch, 5+ positions 10 LEDs - 6 sockets Potentiometers: One potentiometer per step, to indicate direction? Pointer1 = 0; right_rib_x = width_mm - hole_dist_side - thickness; // additives - labels, etc // one more vertical to mount the circuit board to, dead center // one more to mount a circuit outside the full dev board (in some cases) Arduino + DAC https://www.youtube.com/watch?v=t3kUPjdiq0o for explainer https://drive.google.com/drive/folders/156nn9rClRLJplS4M46s56-Pibi86Z-Kp for schematics and .ino file uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on the bottom of box [right_edge, -extra_depth], // top.

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