challenge-bot.com Git - challenge-bot/blob - 3d-printables/sonar-table-top-holder-data.scad

   1 /*
   2   Copyright (C) 2015 Daniel Watson
   3   See the end of the file for license conditions.
   4 */
   5 // challenge-bot
   6 // GNU AGPLv3 (or later at your option)
   7 // project available here:
   8 // https://challenge-bot.com/
   9
  10 /*
  11   this holds an hc-sr04 sonar sensor to a 3/16 inch deck.
  12   http://fritzing.org/projects/hc-sr04-project
  13   it can hold the sonar sensor either facing down, or forwards.
  14   when facing down, it can detect if it passes over the edge of a table.
  15   when facing forwards, it can detect and follow something in front of it.
  16  */
  17
  18 $fn = 60;
  19
  20 // 3/16 inch in mm deck_depth = 4.7625;
  21 // 1/4 inch in mm = 6.35
  22 // subtract a little to be a squeeze fit
  23 deck_depth = 4.7625 - 0.4;
  24 // sonar sensor measurements taken with calipers:
  25 //  10.82 in between, 42.33 outside, 15.82 diameter
  26 // measured diameter of 15.82 with calipers,
  27 //  but when printed ends up being too small, so add some
  28 sonar_diameter = 15.82 + 0.5;
  29 sonar_radius = sonar_diameter / 2;
  30 sonar_height = 13.8;
  31 between_sonar_centers = sonar_diameter + 10.82;
  32 // the sonar cylinders are placed on the pcb at slightly different positions
  33 //  from one sensor to the next, so this allows for that variance.
  34 between_sonar_centers_variance = 2;
  35 // keep at least this much plastic surrounding the sonar cylinder on all sides
  36 buffer = 3;
  37 sonar_holder_length = buffer + between_sonar_centers + sonar_diameter + buffer;
  38 sonar_holder_width = buffer + sonar_diameter + buffer;
  39 // sonar_holder_depth is deck_depth minus a little bit to make arm fit
  40 //  into deck holder
  41 sonar_holder_depth = deck_depth - 0.7875;
  42
  43 deck_holder_length = sonar_holder_depth * 2 + deck_depth + 15;
  44 module sonar_holder_2d() {
  45   difference() {
  46     square([sonar_holder_length, sonar_holder_width]); } }
  47
  48 module sonars() {
  49   translate([between_sonar_centers / 2, 0, 0]) {
  50     hull() {
  51       cylinder(r = sonar_radius, h = sonar_height);
  52       // for the variance with which the physical sonar cylinders are placed
  53       translate([ -between_sonar_centers_variance, 0, 0]) {
  54         cylinder(r = sonar_radius, h = sonar_height); } } }
  55   translate([-between_sonar_centers / 2, 0, 0]) {
  56     cylinder(r = sonar_radius, h = sonar_height); } }
  57
  58 module sonar_holder() {
  59   elbow_length = deck_depth - 0.2;
  60   rounded_corner_radius = buffer;
  61   difference() {
  62     cube([sonar_holder_length, sonar_holder_width, sonar_holder_depth]);
  63     translate([sonar_holder_length / 2, sonar_holder_width / 2, -0.05]) {
  64       sonars(); }
  65     translate([sonar_holder_length,
  66                sonar_holder_width,
  67                0]) {
  68       corner_rounder(rounded_corner_radius,
  69                      sonar_holder_depth,
  70                      "bottom-right"); } }
  71   translate([sonar_holder_length, 0, 0]) {
  72     cube([elbow_length, deck_depth, sonar_holder_depth]);
  73     translate([elbow_length, 0, 0]) {
  74       linear_extrude(height = sonar_holder_depth) {
  75         polygon([[                 0, 0],
  76                  [sonar_holder_depth, 0],
  77                  [sonar_holder_depth, sonar_holder_width / 2],
  78                  [                 0, sonar_holder_width / 2
  79                                       + sonar_holder_depth]]); }
  80       translate([0, (sonar_holder_width + sonar_holder_depth) / 2, 0]) {
  81         cube([sonar_holder_depth / 2,
  82               (sonar_holder_width - sonar_holder_depth) / 2 + 0.8,
  83               sonar_holder_depth]); }
  84       translate([-1.7, sonar_holder_width + 0.8, 0]) {
  85         linear_extrude(height = sonar_holder_depth) {
  86           polygon([[                           0, 0],
  87                    [sonar_holder_depth / 2 + 1.7, 4],
  88                    [sonar_holder_depth / 2 + 1.7, 0]]); } } } } }
  89
  90 module corner_rounder_2d(radius, corner_name = "top-left") {
  91   rotate_for_corner = (corner_name == "top-left") ? 0 :
  92                       ((corner_name == "top-right") ? -90 :
  93                        ((corner_name == "bottom-left") ? 90 :
  94                         ((corner_name == "bottom-right") ? 180 :
  95                          1 / 0)));
  96   rotate(rotate_for_corner) {
  97     difference() {
  98       square(radius);
  99       translate([radius, radius]) {
 100         circle(radius); } } } }
 101
 102 module corner_rounder(radius, height, corner_name = "top-left") {
 103   linear_extrude(height = height) {
 104     corner_rounder_2d(radius, corner_name); } }
 105
 106 /*
 107   This file is part of challenge-bot.
 108
 109   Challenge-bot is free software: you can redistribute it and/or modify
 110   it under the terms of the GNU Affero General Public License as published by
 111   the Free Software Foundation, either version 3 of the License, or
 112   (at your option) any later version.
 113
 114   GNU Affero Emacs is distributed in the hope that it will be useful,
 115   but WITHOUT ANY WARRANTY; without even the implied warranty of
 116   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 117   GNU Affero General Public License for more details.
 118
 119   You should have received a copy of the GNU Affero General Public License
 120   along with challenge-bot.  If not, see <http://www.gnu.org/licenses/>.
 121 */