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 // calculated
  46
  47 strain_0_y_c = main_y_min - strain_w/2;
  48 strain_1_y_c = strain_0_y_c - strain_pitch_along;
  49 total_y_min = strain_1_y_c - strain_w/2 - side_wall_th;
  50
  51 module BothSides(){
  52   for (m=[0,1]) {
  53     mirror([m,0]) {
  54       children();
  55     }
  56   }
  57 }
  58 module FrontWallsPlan(slop) {
  59   BothSides(){
  60     rectfromto([ -board_w/2 - side_wall_th,    0             ],
  61                [ -usb_w/2 - slop,              front_wall_th ]);
  62   }
  63 }
  64 module TopSmallWallsPlan() {
  65   for (m=[0,1]) {
  66     mirror([m,0]) {
  67       rectfromto([ -usb_w/2,              -0.01        ],
  68                  [ -usb_w/2 + usb_wall_w, usb_tongue_d ]);
  69     }
  70   }
  71   FrontWallsPlan(0);
  72   for (w=small_walls) {
  73     rectfromto(w[0], w[1]);
  74   }
  75 }
  76 module TopCeilPlan() {
  77   difference(){
  78     BothSides(){
  79       rectfromto([ -usb_w/2,              -0.01        ],
  80                  [ 0.1,                   usb_tongue_d ]);
  81       rectfromto([ -board_w/2 - side_wall_th, 0            ],
  82                  [ 0.1,                       ceil_y_min   ]);
  83     }
  84     rectfromto(chip_cutout[0], chip_cutout[1]);
  85   }
  86 }
  87 module TopMainWallsPlan() {
  88   BothSides(){
  89     rectfromto([ -board_w/2 - side_wall_th, 0          ],
  90                [ -board_w/2,                wall_y_min ]);
  91   }
  92   FrontWallsPlan(usb_tongue_w_slop);
  93   rectfromto([ -board_w/2 - side_wall_th + 0, -      board_l   ],
  94              [ +board_w/2 + side_wall_th,            total_y_min ]);
  95 }
  96
  97 module Top(){ ////toplevel
  98   difference(){
  99     union(){
 100       linextr(0, usb_wall_h)
 101         TopSmallWallsPlan();
 102       linextr(usb_wall_h - usb_ceil_th, usb_wall_h)
 103         TopCeilPlan();
 104       linextr(-board_th, usb_wall_h)
 105         TopMainWallsPlan();
 106     }
 107
 108     for (y_c = [strain_0_y_c, strain_1_y_c]) {
 109       for (x_c = [-1,+1] * strain_pitch_across/2) {
 110         translate([x_c, y_c, 0])
 111           linextr(-20, 20)
 112           square([ strain_t, strain_w ], center=true);
 113       }
 114     }
 115     linextr_y_xz(total_y_min-1, main_y_min)
 116       translate([0, -board_th])
 117       scale([1, strain_groove_d/strain_groove_w])
 118       circle(strain_groove_w/2, $fn = 8);
 119   }
 120 }
 121
 122 module Bottom(){ ////toplevel
 123 }