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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 version Alternative: CV from something else use a modified version of the work other than the SPDT switch, needed a nut behind the panel module h_wall(h, l, th=thickness) { module label(string, size=4, halign="center", height=thickness+1, font=default_label_font) { color([1,0,0]) linear_extrude(height) text(string, size, halign=halign, font=font_for_label); } //module title(string, size=9.

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