hc-sr04.scad

   1 eps = 0.01;
   2 infty = 100;
   3
   4 wall = 1.5;
   5
   6 cyl_r = 8 + 0.5;
   7 cyl_x = 27 / 2;
   8 cyl_h = 10; // above pcb, max 13.8;
   9
  10 pcb_x = 45 + 0.5;
  11 pcb_y = 20 + 0.5;
  12 xtal_h = 4;
  13 pcb_supp = 3;
  14 pcb_h = 5; // 1.2 + space for connector etc
  15
  16 cyl_base = pcb_x/2 + wall - cyl_x;
  17
  18 conn_x = 12.5;
  19 conn_y = 10;
  20
  21 cable_w = 5;
  22 cable_h = 2;
  23
  24 mount_h = 3;
  25 screw_sp = 5;
  26
  27 module sensor() {
  28         hull() {
  29                 // pcb and the space above it
  30                 translate([-pcb_x/2, -pcb_y/2, -eps])
  31                         cube([pcb_x, pcb_y, pcb_h+eps]);
  32                 // connector
  33                 translate([-conn_x/2, pcb_y/2-eps, -eps])
  34                         cube([conn_x, conn_y+eps, pcb_h+eps]);
  35         }
  36         // cable protrusion
  37         translate([-cable_w/2, pcb_y/2+conn_y-eps, -eps])
  38                 cube([cable_w, 2*wall + eps, cable_h]);
  39
  40         // cylinders
  41         for (x = [-1, 1]) translate([cyl_x*x, 0, pcb_h - eps])
  42                 cylinder(r = cyl_r, h = cyl_h + 2+wall + eps);
  43         // space below the pcb (xtal, etc)
  44         translate([-pcb_x/2+pcb_supp, -pcb_y/2, pcb_h - eps])
  45                 cube([pcb_x - 2*pcb_supp, pcb_y, xtal_h+eps]);
  46 };
  47 module case_body() {
  48         hull() {
  49                 // pcb
  50                 translate([-pcb_x/2-wall, -pcb_y/2-wall, 0])
  51                         cube([pcb_x+2*wall, pcb_y+2*wall, pcb_h+wall]);
  52
  53                 // cylinders
  54                 for (x = [-1, 1]) translate([cyl_x*x, 0, pcb_h + cyl_h])
  55                         cylinder(r = cyl_base, h = wall);
  56
  57                 translate([0, 7, pcb_h + cyl_h])
  58                         cylinder(r = cyl_base, h = wall);
  59
  60                 // connector
  61                 translate([-conn_x/2-wall, pcb_y/2-wall, 0])
  62                         cube([conn_x+2*wall, conn_y+2*wall, pcb_h+wall]);
  63         }
  64         for (x = [0, 180]) rotate([0, 0, x]) hull() {
  65                 // eps-wide cube
  66                 translate([pcb_x/2-eps, -4/2-wall, pcb_h + cyl_h + wall -eps])
  67                         cube([eps, 4+2*wall, eps]);
  68                 // bottom plate
  69                 translate([pcb_x/2+wall, -screw_sp/2-wall, 0])
  70                         cube([screw_sp+wall, screw_sp+2*wall, wall]);
  71         }
  72 }
  73
  74 difference() {
  75         case_body();
  76         # sensor();
  77         // mount holes
  78         for (x = [0, 180]) rotate([0, 0, x]) {
  79                 translate([pcb_x/2+wall, -screw_sp/2, wall])
  80                         cube([screw_sp +wall+eps, screw_sp, pcb_h + cyl_h + eps]);
  81                 translate([pcb_x/2+1+wall, -3/2, -eps])
  82                         cube([3, 3, wall + 2*eps]);
  83         }
  84         // text
  85         translate([0, 3, pcb_h + cyl_h + eps])
  86                 rotate([0, 0, 90])
  87                 linear_extrude(height=wall)
  88                 text("CVT FI", font="DejaVu Sans:style=Bold", size=5,
  89                         halign="center", valign="center");
  90
  91 }
  92