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 cable_space_z = 6;
  46 bottom_floor_th = 1.5;
  47
  48 fit_gap_z = 0.5;
  49
  50 // calculated
  51
  52 top_top_z = usb_wall_h;
  53 top_base_z = -board_th;
  54 bottom_base_z = top_base_z - cable_space_z - bottom_floor_th;;
  55
  56 front_y_max = front_wall_th;
  57
  58 strain_0_y_c = main_y_min - strain_w/2;
  59 strain_1_y_c = strain_0_y_c - strain_pitch_along;
  60 total_y_min = strain_1_y_c - strain_w/2 - side_wall_th;
  61
  62 bottom_wall_top_z = (top_top_z + top_base_z) * 0.5 - fit_gap_z/2;
  63 cover_wall_top_z  = (top_top_z + top_base_z) * 0.5 + fit_gap_z/2;
  64
  65 top_side_wall_x = +board_w/2 + side_wall_th;
  66
  67 module BothSides(){
  68   for (m=[0,1]) {
  69     mirror([m,0]) {
  70       children();
  71     }
  72   }
  73 }
  74 module FrontWallsPlan(slop) {
  75   BothSides(){
  76     rectfromto([ -board_w/2 - side_wall_th,    0             ],
  77                [ -usb_w/2 - slop,              front_wall_th ]);
  78   }
  79 }
  80 module TopSmallWallsPlan() {
  81   for (m=[0,1]) {
  82     mirror([m,0]) {
  83       rectfromto([ -usb_w/2,              -0.01        ],
  84                  [ -usb_w/2 + usb_wall_w, usb_tongue_d ]);
  85     }
  86   }
  87   FrontWallsPlan(0);
  88   for (w=small_walls) {
  89     rectfromto(w[0], w[1]);
  90   }
  91 }
  92 module TopCeilPlan() {
  93   difference(){
  94     BothSides(){
  95       rectfromto([ -usb_w/2,              -0.01        ],
  96                  [ 0.1,                   usb_tongue_d ]);
  97       rectfromto([ -board_w/2 - side_wall_th, 0            ],
  98                  [ 0.1,                       ceil_y_min   ]);
  99     }
 100     rectfromto(chip_cutout[0], chip_cutout[1]);
 101   }
 102 }
 103 module TopMainWallsPlan() {
 104   BothSides(){
 105     rectfromto([ -board_w/2 - side_wall_th, 0          ],
 106                [ -board_w/2,                wall_y_min ]);
 107   }
 108   FrontWallsPlan(usb_tongue_w_slop);
 109   rectfromto([ -board_w/2 - side_wall_th + 0, -      board_l   ],
 110              [ +board_w/2 + side_wall_th,            total_y_min ]);
 111 }
 112
 113 module Top(){ ////toplevel
 114   difference(){
 115     union(){
 116       linextr(0, usb_wall_h)
 117         TopSmallWallsPlan();
 118       linextr(usb_wall_h - usb_ceil_th, usb_wall_h)
 119         TopCeilPlan();
 120       linextr(-board_th, usb_wall_h)
 121         TopMainWallsPlan();
 122     }
 123
 124     for (y_c = [strain_0_y_c, strain_1_y_c]) {
 125       for (x_c = [-1,+1] * strain_pitch_across/2) {
 126         translate([x_c, y_c, 0])
 127           linextr(-20, 20)
 128           square([ strain_t, strain_w ], center=true);
 129       }
 130     }
 131     linextr_y_xz(total_y_min-1, main_y_min)
 132       translate([0, top_base_z])
 133       scale([1, strain_groove_d/strain_groove_w])
 134       circle(strain_groove_w/2, $fn = 8);
 135   }
 136 }
 137
 138 module BottomMainElevation(){ ////toplevel
 139   difference(){
 140     rectfromto([ -top_side_wall_x, bottom_base_z ],
 141                [ +top_side_wall_x, top_base_z    ]);
 142   }
 143 }
 144 module Bottom(){ ////toplevel
 145   linextr_y_xz(total_y_min, front_y_max)
 146     BottomMainElevation();
 147 }
 148
 149 module BottomDemo(){ ////toplevel
 150   Bottom();
 151   translate([0, 0, 0.25]) %Top();
 152 }