things/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 = 26.6 / 2;
   8 cyl_h = 8; // above pcb, max 13.8;
   9
  10 pcb_x = 45.6 + 1.0;
  11 pcb_y = 20.2 + 0.7;
  12 xtal_h = 5;
  13 pcb_supp = 3; // side support thickness
  14 pcb_h = 8; // 1.2 + space for connector etc
  15 pcb_thick = 2.5;
  16
  17 cyl_base = pcb_x/2 + wall - cyl_x;
  18
  19 conn_x = 10 + 0.5;
  20 conn_y = 15;
  21
  22 cable_w = 7;
  23 cable_h = 4;
  24
  25 screw_head = 7.5;
  26 screw_d = 4;
  27 screw_base = 2*wall;
  28
  29 clip_r = 1;
  30 clip_h = 8;
  31
  32 module sensor() {
  33         hull() {
  34                 // space above pcb
  35                 translate([-pcb_x/2, -pcb_y/2, -eps])
  36                         cube([pcb_x, pcb_y, pcb_h-pcb_thick+eps]);
  37                 // connector
  38                 translate([-conn_x/2, pcb_y/2-eps, -eps])
  39                         cube([conn_x, conn_y+eps, pcb_h-pcb_thick+eps]);
  40         }
  41         // cable protrusion
  42         translate([-cable_w/2, pcb_y/2+conn_y-eps, -eps])
  43                 cube([cable_w, 2*wall + eps, cable_h]);
  44
  45         // cylinders
  46         for (x = [-1, 1]) translate([cyl_x*x, 0, pcb_h - eps])
  47                 cylinder(r = cyl_r, h = cyl_h + 2+wall + eps);
  48         // pcb
  49         translate([-pcb_x/2, -pcb_y/2, pcb_h-pcb_thick-eps])
  50                 cube([pcb_x, pcb_y, pcb_thick+eps]);
  51         // space below the pcb (xtal, etc)
  52         translate([-pcb_x/2+pcb_supp, -pcb_y/2, pcb_h-pcb_thick - eps])
  53                 cube([pcb_x - 2*pcb_supp, pcb_y, xtal_h+pcb_thick+eps]);
  54 };
  55 module case_body() {
  56         hull() {
  57                 // pcb
  58                 translate([-pcb_x/2-wall, -pcb_y/2-wall, 0])
  59                         cube([pcb_x+2*wall, pcb_y+2*wall, pcb_h+wall]);
  60
  61                 // cylinders
  62                 for (x = [-1, 1]) translate([cyl_x*x, 0, pcb_h + cyl_h])
  63                         cylinder(r = cyl_base, h = wall);
  64
  65                 translate([0, 8, pcb_h + cyl_h])
  66                         cylinder(r = cyl_base, h = wall);
  67
  68                 // connector
  69                 translate([-conn_x/2-wall, pcb_y/2-wall, 0])
  70                         cube([conn_x+2*wall, conn_y+2*wall, pcb_h-pcb_thick+wall]);
  71                 // screw mounts
  72                 for (x = [1, -1]) scale([x, 1, 1])
  73                         translate([pcb_x/2+wall, -screw_head/2-wall, 0])
  74                                 cube([screw_head, screw_head+2*wall, screw_base]);
  75         }
  76 }
  77
  78 module case() {
  79         difference() {
  80                 case_body();
  81                 difference() {
  82                         sensor();
  83                         // pcb clip
  84                         translate([-clip_h/2, -pcb_y/2, pcb_h-pcb_thick-clip_r/2])
  85                         rotate([0, 90, 0])
  86                         cylinder(r=clip_r, h = clip_h, $fn = 4);
  87                 }
  88                 // mount holes
  89                 for (x = [-1, 1]) scale([x, 1, 1]) {
  90                         translate([pcb_x/2+wall, -screw_head/2, screw_base])
  91                                 cube([screw_head+eps, screw_head, infty]);
  92                         // screw hole
  93                         translate([pcb_x/2+wall+screw_head/2-screw_d/2, -screw_head/2, -eps])
  94                                 cube([screw_d, screw_head, infty]);
  95                 }
  96                 // text
  97                 translate([0, 3.5, pcb_h + cyl_h + eps])
  98                         rotate([0, 0, 90])
  99                         linear_extrude(height=wall)
 100                         text("CVT FI", font="DejaVu Sans:style=Bold", size=5,
 101                                 halign="center", valign="center");
 102         }
 103 }
 104
 105 rotate([180, 0, 0]) // rotate it for easier print
 106         case();