digispark-with-cable.scad

   1 // -*- C -*-
   2
   3 include <utils.scad>
   4
   5 //tongue_w = 11.92 + 0.4;
   6
   7 usb_w = 12.01 + 0.19;
   8 usb_wall_w = 0.51;
   9 usb_tongue_d = 8.97 - 0.2;
  10 usb_tongue_w_slop = +0.5;
  11 usb_wall_h = 4.54 - 2.04;
  12 usb_ceil_th = 0.425;
  13
  14 side_wall_th = 1.5;
  15
  16 board_l = 17.56 + 0.2;
  17 board_w = 19.14 + 0.2;
  18 board_th = 1.92 + 0.1;
  19
  20 sw_to_edge = board_w/2 + 0.1;
  21
  22 front_wall_th = 0.75;
  23 // egress_w = 8.0;
  24
  25 wall_y_min = -board_l - side_wall_th; // XXXX remove
  26 main_y_min = -board_l - side_wall_th;
  27 ceil_y_min = wall_y_min - 5;;
  28
  29 small_walls = [
  30                [ [0, 0], [-sw_to_edge, -1.0] ],
  31                [ [sw_to_edge-4.5, -4.5], [sw_to_edge, -5.7] ],
  32 //             [ [3.0, -11.72],              [sw_to_edge, -13.38] ],
  33                [ [-sw_to_edge+3.85, -14.90], [sw_to_edge, -13.38] ],
  34                ];
  35 chip_cutout = [[ -sw_to_edge + 4.20,    -3.75 ],
  36                [ -sw_to_edge + 11.95,  -11.90 ]];
  37
  38 strain_w = 2.0 + 0.5;
  39 strain_t = 1.0 + 0.5;
  40 strain_pitch_across = 5;
  41 strain_pitch_along = 10;
  42 strain_groove_d = 2;
  43 strain_groove_w = 3;
  44
  45 fit_gap_z = 0.5;
  46
  47 // calculated
  48
  49 top_top_z = usb_wall_h;
  50 top_base_z = -board_th;
  51
  52 strain_0_y_c = main_y_min - strain_w/2;
  53 strain_1_y_c = strain_0_y_c - strain_pitch_along;
  54 total_y_min = strain_1_y_c - strain_w/2 - side_wall_th;
  55
  56 bottom_wall_top_z = (top_top_z + top_base_z) * 0.5 - fit_gap_z/2;
  57 cover_wall_top_z  = (top_top_z + top_base_z) * 0.5 + fit_gap_z/2;
  58
  59 bop_side_wall_x = +board_w/2 + side_wall_th;
  60
  61 module BothSides(){
  62   for (m=[0,1]) {
  63     mirror([m,0]) {
  64       children();
  65     }
  66   }
  67 }
  68 module FrontWallsPlan(slop) {
  69   BothSides(){
  70     rectfromto([ -board_w/2 - side_wall_th,    0             ],
  71                [ -usb_w/2 - slop,              front_wall_th ]);
  72   }
  73 }
  74 module TopSmallWallsPlan() {
  75   for (m=[0,1]) {
  76     mirror([m,0]) {
  77       rectfromto([ -usb_w/2,              -0.01        ],
  78                  [ -usb_w/2 + usb_wall_w, usb_tongue_d ]);
  79     }
  80   }
  81   FrontWallsPlan(0);
  82   for (w=small_walls) {
  83     rectfromto(w[0], w[1]);
  84   }
  85 }
  86 module TopCeilPlan() {
  87   difference(){
  88     BothSides(){
  89       rectfromto([ -usb_w/2,              -0.01        ],
  90                  [ 0.1,                   usb_tongue_d ]);
  91       rectfromto([ -board_w/2 - side_wall_th, 0            ],
  92                  [ 0.1,                       ceil_y_min   ]);
  93     }
  94     rectfromto(chip_cutout[0], chip_cutout[1]);
  95   }
  96 }
  97 module TopMainWallsPlan() {
  98   BothSides(){
  99     rectfromto([ -board_w/2 - side_wall_th, 0          ],
 100                [ -board_w/2,                wall_y_min ]);
 101   }
 102   FrontWallsPlan(usb_tongue_w_slop);
 103   rectfromto([ -board_w/2 - side_wall_th + 0, -      board_l   ],
 104              [ +board_w/2 + side_wall_th,            total_y_min ]);
 105 }
 106
 107 module Top(){ ////toplevel
 108   difference(){
 109     union(){
 110       linextr(0, usb_wall_h)
 111         TopSmallWallsPlan();
 112       linextr(usb_wall_h - usb_ceil_th, usb_wall_h)
 113         TopCeilPlan();
 114       linextr(-board_th, usb_wall_h)
 115         TopMainWallsPlan();
 116     }
 117
 118     for (y_c = [strain_0_y_c, strain_1_y_c]) {
 119       for (x_c = [-1,+1] * strain_pitch_across/2) {
 120         translate([x_c, y_c, 0])
 121           linextr(-20, 20)
 122           square([ strain_t, strain_w ], center=true);
 123       }
 124     }
 125     linextr_y_xz(total_y_min-1, main_y_min)
 126       translate([0, top_base_z])
 127       scale([1, strain_groove_d/strain_groove_w])
 128       circle(strain_groove_w/2, $fn = 8);
 129   }
 130 }
 131
 132 module BottomMainElevation(){ ////toplevel
 133   difference(){
 134 //    rectfromto([
 135   }
 136 }
 137 module Bottom(){ ////toplevel
 138 }