--- /dev/null
+// challenge-bot
+// GNU AGPLv3 (or later at your option)
+// project available at these locations:
+// https://gitorious.org/ozzloy/challenge-bot
+// https://github.com/waynegramlich/challenge-bot
+
+/*
+ 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;
+
+use <oshw.scad>
+// 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;
+
+oshw_dy = 120.366;
+oshw_dx = 133.888;
+
+// 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 sonars() {
+ translate([between_sonar_centers / 2, 0, 0]) {
+ cylinder(r = sonar_radius, h = sonar_height); }
+ // for the variance with which the physical sonar cylinders are placed
+ translate([between_sonar_centers / 2 - between_sonar_centers_variance, 0, 0]) {
+ cylinder(r = sonar_radius, h = sonar_height);
+ translate([0, -sonar_radius, 0]) {
+ cube([between_sonar_centers_variance, sonar_diameter, sonar_height]); } }
+ translate([-between_sonar_centers / 2, 0, 0]) {
+ cylinder(r = sonar_radius, h = sonar_height); } }
+
+module sonar_holder() {
+ elbow_length = deck_depth;
+ rounded_corner_radius = buffer;
+ difference() {
+ cube([sonar_holder_length, sonar_holder_width, sonar_holder_depth]);
+ translate([sonar_holder_length / 2, sonar_holder_width / 2, -0.05]) {
+ sonars(); }
+ translate([sonar_holder_length - rounded_corner_radius,
+ sonar_holder_width - rounded_corner_radius,
+ 0]) {
+ corner_rounder(rounded_corner_radius, sonar_holder_depth); } }
+ translate([sonar_holder_length, 0, 0]) {
+ cube([elbow_length, deck_depth, sonar_holder_depth]);
+ translate([elbow_length, 0, 0]) {
+ linear_extrude(height = sonar_holder_depth) {
+ polygon([[ 0, 0],
+ [sonar_holder_depth, 0],
+ [sonar_holder_depth, sonar_holder_width / 2],
+ [ 0,
+ sonar_holder_width / 2 + sonar_holder_depth]]); }
+ translate([0, (sonar_holder_width + sonar_holder_depth) / 2, 0]) {
+ cube([sonar_holder_depth / 2,
+ (sonar_holder_width - sonar_holder_depth) / 2 + 0.8,
+ sonar_holder_depth]); }
+ translate([-1.7, sonar_holder_width + 0.8, 0]) {
+ linear_extrude(height = sonar_holder_depth) {
+ polygon([[ 0, 0],
+ [sonar_holder_depth / 2 + 1.7, 4],
+ [sonar_holder_depth / 2 + 1.7, 0]]); } } } } }
+
+module deck_holder() {
+ 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]) {
+ 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(); }
+
+module corner_rounder_2d(radius) {
+ difference() {
+ square(radius);
+ circle(radius); } }
+
+module corner_rounder(radius, height) {
+ linear_extrude(height = height) {
+ corner_rounder_2d(radius); } }
projects / challenge-bot / blobdiff