Add initial OpenSCAD case files

openscad/.gitignore

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+*.stl
+pcb.scad

openscad/Makefile

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+.PHONY: all clean
+
+all: case.stl
+
+pcb.scad: generate.py ../kicad/Digital\ Audio\ Switch.kicad_pcb
+	python3 $< > $@
+
+case.stl: case.scad pcb.scad
+	openscad -o $@ case.scad
+
+clean:
+	rm -f case.stl pcb.scad

openscad/case.scad

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+$fn = 50;
+
+use <pcb.scad>;
+
+color("green", 0.5)
+translate([0,0,10])
+    pcb(1.6);
+
+mounting_supports(h=10,r=4);

openscad/generate.py

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+import sexpdata as s
+
+
+def cadr(x):
+    return s.car(s.cdr(x))
+
+
+def cddr(x):
+    return s.cdr(s.cdr(x))
+
+
+with open("../kicad/Digital Audio Switch.kicad_pcb", "r") as f:
+    kicad_pcb = s.load(f)
+
+
+# Assumes the board is cut out with a single rectangle
+[rect] = [
+    s.cdr(x)
+    for x in kicad_pcb
+    if s.car(x) == s.Symbol("gr_rect") and [s.Symbol("layer"), "Edge.Cuts"] in s.cdr(x)
+]
+[[start_x, start_y]] = [s.cdr(x) for x in rect if s.car(x) == s.Symbol("start")]
+[[end_x, end_y]] = [s.cdr(x) for x in rect if s.car(x) == s.Symbol("end")]
+[start_x, start_y, end_x, end_y] = [
+    min(start_x, end_x),
+    min(start_y, end_y),
+    max(start_x, end_x),
+    max(start_y, end_y),
+]
+width = end_x - start_x
+height = end_y - start_y
+print(
+    f"""
+module board() {{
+    square([{width}, {height}]);
+}}
+    """.strip()
+)
+
+footprints = [
+    s.cdr(x)
+    for x in kicad_pcb
+    if s.car(x) == s.Symbol("footprint") and s.car(s.cdr(x)).startswith("MountingHole:")
+]
+
+holes = []
+for hole in footprints:
+    [[hole_x, hole_y]] = [s.cdr(x) for x in hole if s.car(x) == s.Symbol("at")]
+    pads = [cddr(x) for x in hole if s.car(x) == s.Symbol("pad")]
+    for pad in pads:
+        [[pad_x, pad_y]] = [s.cdr(x) for x in pad if s.car(x) == s.Symbol("at")]
+        drills = [cadr(x) for x in pad if s.car(x) == s.Symbol("drill")]
+        for diameter in drills:
+            # print([hole_x + pad_x, hole_y + pad_y, diameter])
+            pos_x = (hole_x + pad_x) - start_x
+            pos_y = (hole_y + pad_y) - start_y
+            holes.append((pos_x, pos_y, diameter))
+
+print("module mounting_holes() {")
+for pos_x, pos_y, diameter in holes:
+    print(f"translate([{pos_x}, {pos_y}]) circle(d={diameter});")
+print("}")
+
+print("module mounting_posts(r, h) {")
+for pos_x, pos_y, diameter in holes:
+    print(
+        " ".join(
+            [
+                f"translate([{pos_x}, {pos_y}]) ",
+                f"linear_extrude(h)",
+                f"circle(d={diameter} + (r * 2));",
+            ]
+        )
+    )
+
+print("}")
+
+print(
+    """
+module pcb(h=1) {
+    linear_extrude(h)
+    difference() {
+        board();
+        mounting_holes();
+    }
+}
+
+module mounting_supports(r, h) {
+    difference() {
+        mounting_posts(r=r, h=h);
+        linear_extrude(h+1) mounting_holes();
+    }
+}
+"""
+)

openscad/requirements.txt

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+sexpdata