/* Copyright (C) 2015 Daniel Watson See the end of the file for license conditions. */ // challenge-bot // GNU AGPLv3 (or later at your option) // project available here: // https://challenge-bot.com/ /* this holds an hc-sr04 sonar sensor to a 3/16 inch deck. http://fritzing.org/projects/hc-sr04-project it can hold the sonar sensor either facing down, or forwards. when facing down, it can detect if it passes over the edge of a table. when facing forwards, it can detect and follow something in front of it. */ $fn = 60; include // 3/16 inch in mm deck_depth = 4.7625; // 1/4 inch in mm = 6.35 // subtract a little to be a squeeze fit deck_depth = 4.7625 - 0.4; // sonar sensor measurements taken with calipers: // 10.82 in between, 42.33 outside, 15.82 diameter // measured diameter of 15.82 with calipers, // but when printed ends up being too small, so add some sonar_diameter = 15.82 + 0.4; sonar_radius = sonar_diameter / 2; sonar_height = 13.8; between_sonar_centers = sonar_diameter + 10.82; // the sonar cylinders are placed on the pcb at slightly different positions // from one sensor to the next, so this allows for that variance. between_sonar_centers_variance = 2; // keep at least this much plastic surrounding the sonar cylinder on all sides buffer = 3; sonar_holder_length = buffer + between_sonar_centers + sonar_diameter + buffer; sonar_holder_width = buffer + sonar_diameter + buffer; // sonar_holder_depth is deck_depth minus a little bit to make arm fit // into deck holder sonar_holder_depth = deck_depth - 0.7875; deck_holder_length = sonar_holder_depth * 2 + deck_depth + 15; module deck_holder() { oshw_height = 0.75; deck_holder_width = sonar_holder_width - deck_depth; deck_holder_height = sonar_holder_depth * 2 + deck_depth; linear_extrude(height = deck_holder_width) { difference() { square([deck_holder_length, deck_holder_height]); translate([sonar_holder_depth - 0.15, sonar_holder_depth - 0.15]) { /* This file is part of challenge-bot. Challenge-bot is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. GNU Affero Emacs is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details. You should have received a copy of the GNU Affero General Public License along with challenge-bot. If not, see . */ square(deck_depth + 0.3); } translate([deck_holder_height, sonar_holder_depth - 0.3]) { square([deck_holder_length - (deck_holder_height), deck_depth + 0.6]); } } } translate([deck_holder_length - oshw_dy * 0.05, 0, deck_holder_width / 2]) scale([0.1, 1, 0.1]) rotate(v = [1, 0, 0], a = 90) rotate(90) linear_extrude(height = 0.5) oshw(); translate([deck_holder_length - oshw_dy * 0.05, deck_holder_height + 0.5, deck_holder_width / 2]) rotate(v = [1, 0, 0], a = 90) rotate(90) scale([0.1, 0.1, 1]) linear_extrude(height = 0.5) oshw(); }