3d90aff0 |
1 | // challenge-bot |
2 | // GNU AGPLv3 (or later at your option) |
3 | // project available at these locations: |
4 | // https://gitorious.org/ozzloy/challenge-bot |
5 | // https://github.com/waynegramlich/challenge-bot |
6 | |
7 | /* |
8 | this holds an hc-sr04 sonar sensor to a 3/16 inch deck. |
9 | http://fritzing.org/projects/hc-sr04-project |
10 | it can hold the sonar sensor either facing down, or forwards. |
11 | when facing down, it can detect if it passes over the edge of a table. |
12 | when facing forwards, it can detect and follow something in front of it. |
13 | */ |
14 | |
15 | $fn = 60; |
16 | |
17 | use <oshw.scad> |
18 | // 3/16 inch in mm deck_depth = 4.7625; |
19 | // 1/4 inch in mm = 6.35 |
20 | // subtract a little to be a squeeze fit |
21 | deck_depth = 4.7625 - 0.4; |
22 | // sonar sensor measurements taken with calipers: |
23 | // 10.82 in between, 42.33 outside, 15.82 diameter |
24 | // measured diameter of 15.82 with calipers, |
25 | // but when printed ends up being too small, so add some |
26 | sonar_diameter = 15.82 + 0.4; |
27 | sonar_radius = sonar_diameter / 2; |
28 | sonar_height = 13.8; |
29 | between_sonar_centers = sonar_diameter + 10.82; |
30 | // the sonar cylinders are placed on the pcb at slightly different positions |
31 | // from one sensor to the next, so this allows for that variance. |
32 | between_sonar_centers_variance = 2; |
33 | // keep at least this much plastic surrounding the sonar cylinder on all sides |
34 | buffer = 3; |
35 | sonar_holder_length = buffer + between_sonar_centers + sonar_diameter + buffer; |
36 | sonar_holder_width = buffer + sonar_diameter + buffer; |
37 | // sonar_holder_depth is deck_depth minus a little bit to make arm fit |
38 | // into deck holder |
39 | sonar_holder_depth = deck_depth - 0.7875; |
40 | |
41 | deck_holder_length = sonar_holder_depth * 2 + deck_depth + 15; |
42 | |
43 | oshw_dy = 120.366; |
44 | oshw_dx = 133.888; |
45 | |
46 | // 3/16 inch in mm deck_depth = 4.7625; |
47 | // 1/4 inch in mm = 6.35 |
48 | // subtract a little to be a squeeze fit |
49 | deck_depth = 4.7625 - 0.4; |
50 | // sonar sensor measurements taken with calipers: |
51 | // 10.82 in between, 42.33 outside, 15.82 diameter |
52 | // measured diameter of 15.82 with calipers, |
53 | // but when printed ends up being too small, so add some |
54 | sonar_diameter = 15.82 + 0.4; |
55 | sonar_radius = sonar_diameter / 2; |
56 | sonar_height = 13.8; |
57 | between_sonar_centers = sonar_diameter + 10.82; |
58 | // the sonar cylinders are placed on the pcb at slightly different positions |
59 | // from one sensor to the next, so this allows for that variance. |
60 | between_sonar_centers_variance = 2; |
61 | // keep at least this much plastic surrounding the sonar cylinder on all sides |
62 | buffer = 3; |
63 | sonar_holder_length = buffer + between_sonar_centers + sonar_diameter + buffer; |
64 | sonar_holder_width = buffer + sonar_diameter + buffer; |
65 | // sonar_holder_depth is deck_depth minus a little bit to make arm fit |
66 | // into deck holder |
67 | sonar_holder_depth = deck_depth - 0.7875; |
68 | |
69 | deck_holder_length = sonar_holder_depth * 2 + deck_depth + 15; |
70 | |
71 | module sonars() { |
72 | translate([between_sonar_centers / 2, 0, 0]) { |
73 | cylinder(r = sonar_radius, h = sonar_height); } |
74 | // for the variance with which the physical sonar cylinders are placed |
75 | translate([between_sonar_centers / 2 - between_sonar_centers_variance, 0, 0]) { |
76 | cylinder(r = sonar_radius, h = sonar_height); |
77 | translate([0, -sonar_radius, 0]) { |
78 | cube([between_sonar_centers_variance, sonar_diameter, sonar_height]); } } |
79 | translate([-between_sonar_centers / 2, 0, 0]) { |
80 | cylinder(r = sonar_radius, h = sonar_height); } } |
81 | |
82 | module sonar_holder() { |
83 | elbow_length = deck_depth; |
84 | rounded_corner_radius = buffer; |
85 | difference() { |
86 | cube([sonar_holder_length, sonar_holder_width, sonar_holder_depth]); |
87 | translate([sonar_holder_length / 2, sonar_holder_width / 2, -0.05]) { |
88 | sonars(); } |
89 | translate([sonar_holder_length - rounded_corner_radius, |
90 | sonar_holder_width - rounded_corner_radius, |
91 | 0]) { |
92 | corner_rounder(rounded_corner_radius, sonar_holder_depth); } } |
93 | translate([sonar_holder_length, 0, 0]) { |
94 | cube([elbow_length, deck_depth, sonar_holder_depth]); |
95 | translate([elbow_length, 0, 0]) { |
96 | linear_extrude(height = sonar_holder_depth) { |
97 | polygon([[ 0, 0], |
98 | [sonar_holder_depth, 0], |
99 | [sonar_holder_depth, sonar_holder_width / 2], |
100 | [ 0, |
101 | sonar_holder_width / 2 + sonar_holder_depth]]); } |
102 | translate([0, (sonar_holder_width + sonar_holder_depth) / 2, 0]) { |
103 | cube([sonar_holder_depth / 2, |
104 | (sonar_holder_width - sonar_holder_depth) / 2 + 0.8, |
105 | sonar_holder_depth]); } |
106 | translate([-1.7, sonar_holder_width + 0.8, 0]) { |
107 | linear_extrude(height = sonar_holder_depth) { |
108 | polygon([[ 0, 0], |
109 | [sonar_holder_depth / 2 + 1.7, 4], |
110 | [sonar_holder_depth / 2 + 1.7, 0]]); } } } } } |
111 | |
112 | module deck_holder() { |
113 | deck_holder_width = sonar_holder_width - deck_depth; |
114 | deck_holder_height = sonar_holder_depth * 2 + deck_depth; |
115 | linear_extrude(height = deck_holder_width) { |
116 | difference() { |
117 | square([deck_holder_length, deck_holder_height]); |
118 | translate([sonar_holder_depth - 0.15, sonar_holder_depth - 0.15]) { |
119 | square(deck_depth + 0.3); } |
120 | translate([deck_holder_height, sonar_holder_depth - 0.3]) { |
121 | square([deck_holder_length - (deck_holder_height), |
122 | deck_depth + 0.6]); } } } |
123 | translate([deck_holder_length - oshw_dy * 0.05, 0, deck_holder_width / 2]) |
124 | scale([0.1, 1, 0.1]) |
125 | rotate(v = [1, 0, 0], a = 90) |
126 | rotate(90) |
127 | linear_extrude(height = 0.5) |
128 | oshw(); |
129 | translate([deck_holder_length - oshw_dy * 0.05, |
130 | deck_holder_height + 0.5, |
131 | deck_holder_width / 2]) |
132 | rotate(v = [1, 0, 0], a = 90) |
133 | rotate(90) |
134 | scale([0.1, 0.1, 1]) |
135 | linear_extrude(height = 0.5) |
136 | oshw(); } |
137 | |
138 | module corner_rounder_2d(radius) { |
139 | difference() { |
140 | square(radius); |
141 | circle(radius); } } |
142 | |
143 | module corner_rounder(radius, height) { |
144 | linear_extrude(height = height) { |
145 | corner_rounder_2d(radius); } } |