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 + 0.4;
  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 binder_clip_attacher_length = 30; // not measured; just a rough estimate
  38 screw_hole = 2.2;
  39 sonar_holder_length = buffer + between_sonar_centers + sonar_diameter + buffer + binder_clip_attacher_length;
  40 sonar_holder_width = buffer + sonar_diameter + buffer;
  41 // sonar_holder_depth is deck_depth minus a little bit to make arm fit
  42 //  into deck holder
  43 sonar_holder_depth = deck_depth - 0.7875;
  44
  45 deck_holder_length = sonar_holder_depth * 2 + deck_depth + 15;
  46 module sonar_holder_2d() {
  47   difference() {
  48     square([sonar_holder_length, sonar_holder_width]); } }
  49
  50 module sonars() {
  51   translate([between_sonar_centers / 2, 0, 0]) {
  52     cylinder(r = sonar_radius, h = sonar_height); }
  53   // for the variance with which the physical sonar cylinders are placed
  54   translate([between_sonar_centers / 2 - between_sonar_centers_variance, 0, 0]) {
  55     cylinder(r = sonar_radius, h = sonar_height);
  56     translate([0, -sonar_radius, 0]) {
  57       cube([between_sonar_centers_variance, sonar_diameter, sonar_height]); } }
  58   translate([-between_sonar_centers / 2, 0, 0]) {
  59     cylinder(r = sonar_radius, h = sonar_height); } }
  60
  61 module sonar_holder() {
  62     difference() {
  63       difference() {
  64         cube([sonar_holder_length, sonar_holder_width, sonar_holder_depth]);
  65         translate([sonar_holder_length - between_sonar_centers, sonar_holder_width / 2, -0.05]) {
  66           sonars(); } }
  67       translate([binder_clip_attacher_length / 2, sonar_holder_width / 2], 0) {
  68       cylinder(r =  screw_hole, h = sonar_holder_depth); } } }
  69
  70 module attaching_piece() {
  71   linear_extrude(height = sonar_holder_depth) {
  72     difference() {
  73       square(sonar_holder_width, center = true);
  74       circle(screw_hole); } } }
  75
  76 /*
  77   This file is part of challenge-bot.
  78
  79   Challenge-bot is free software: you can redistribute it and/or modify
  80   it under the terms of the GNU Affero General Public License as published by
  81   the Free Software Foundation, either version 3 of the License, or
  82   (at your option) any later version.
  83
  84   GNU Affero Emacs is distributed in the hope that it will be useful,
  85   but WITHOUT ANY WARRANTY; without even the implied warranty of
  86   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  87   GNU Affero General Public License for more details.
  88
  89   You should have received a copy of the GNU Affero General Public License
  90   along with challenge-bot.  If not, see <http://www.gnu.org/licenses/>.
  91 */