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Yet another fairly simple one, using Arduino (nano or uno) + MCP4725 (DAC). ** https://hkadesign.org.uk/monotronkb.html for yet another fairly simple one, using Arduino (nano or uno) + MCP4725 (DAC). ** https://hkadesign.org.uk/monotronkb.html for yet another version Alternative: CV from something else use a nut behind the front to indicate direction? Pointer1 = 0; right_rib_x = width_mm - thickness*2; union() { cube([board_width, board_height, thickness]); cylinder(thickness+standoff_height, r=standoff_radius, $fn=360); cylinder(h=thickness+standoff_height, r=standoff_radius, $fn=360); cube([cutout_width, cutout_height, thickness+3]); cylinder(h=thickness+standoff_height+3, r=hole_radius, $fn=360); vertex 0 -8.7482 5.33536 facet normal 0.0816481 -0.828735 0.553653 facet normal 3.551635e-001 2.707603e-004 9.348041e-001 facet normal -3.533242e-16 -1.018103e-15 -1.000000e+00 facet normal 0.757711 -0.648786 0.070359 facet normal -3.331021e-001 -5.832563e-001 7.408475e-001 facet normal -0.382438 0.0376556 0.923213 facet normal -0.257261 0.262755 0.929934 vertex -5.42659 4.99768 6.90571 facet normal -0.301695 0.851409 0.429048 facet normal 1.458075e-15 -1.388642e-15 -1.000000e+00 vertex -1.043265e+02 9.725134e+01 5.903821e+00 facet normal 2.508444e-15 1.449967e-15 -1.000000e+00 facet normal -3.267650e-001 -5.718388e-001 7.524793e-001 vertex 2.054227e+000 3.532473e+000 2.488700e+001 facet normal -0.0600064 0.144869 0.98763 vertex 4.57753 -0.177532 18.7299 vertex 3.96091 0.604356 18.8084 facet normal -0.449653 0.547907 0.705415 facet normal 4.709219e-01 -1.317076e-03 8.821739e-01 vertex -1.055569e+02 9.725134e+01 1.138097e+01 facet normal -0.946346 -0.307482 0.0994139 facet normal -0.956942 0.290279 -7.53346e-07 facet normal 1.304263e-001 -2.235998e-001 9.659152e-001 facet normal 0.0823699 -0.081813 0.993238 vertex -4.18518 5.59382 7.89166 facet normal -0.098413 -0.0148312 -0.995035 vertex -9.98521 -0.172147 0.0395563 facet normal -0.114117 -0.0998673 0.988435 facet normal -0.0623605 0.633165 0.771501 facet normal 0.989344 -0.0974275 0.108195 facet normal 0.098397 0.0148716 0.995036 facet normal 0.024206 0.106347 0.994034 facet normal 0.124621 -0.886065 0.446496 vertex 4.17623 5.20841 7.5439 facet normal 0.0808284 0.0827209 0.993289 vertex -4.3279 -5.83299 7.92316 facet normal -0.727323 0.241721 0.642318 facet normal 0.598691.

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