dac38b58 |
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 | |
3d01ee80 |
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 | |
978bd219 |
15 | $fn = 60; |
16 | |
4390b08c |
17 | use <oshw.scad> |
18 | oshw_dy = 120.366; |
19 | oshw_dx = 133.888; |
20 | |
978bd219 |
21 | // 3/16 inch in mm deck_depth = 4.7625; |
be16f419 |
22 | // 1/4 inch in mm = 6.35 |
23 | // subtract a little to be a squeeze fit |
8b340909 |
24 | deck_depth = 4.7625 - 0.4; |
8ca271e9 |
25 | // sonar sensor measurements taken with calipers: |
49bffb72 |
26 | // 10.82 in between, 42.33 outside, 15.82 diameter |
8ca271e9 |
27 | // measured diameter of 15.82 with calipers, |
8b84f6f3 |
28 | // but when printed ends up being too small, so add some |
651bbf4b |
29 | sonar_diameter = 15.82 + 0.4; |
8b84f6f3 |
30 | sonar_radius = sonar_diameter / 2; |
31 | sonar_height = 13.8; |
32 | between_sonar_centers = sonar_diameter + 10.82; |
33 | // the sonar cylinders are placed on the pcb at slightly different positions |
34 | // from one sensor to the next, so this allows for that variance. |
35 | between_sonar_centers_variance = 2; |
36 | // keep at least this much plastic surrounding the sonar cylinder on all sides |
bc750455 |
37 | buffer = 3; |
8b84f6f3 |
38 | sonar_holder_length = buffer + between_sonar_centers + sonar_diameter + buffer; |
39 | sonar_holder_width = buffer + sonar_diameter + buffer; |
bc750455 |
40 | // sonar_holder_depth is deck_depth minus a little bit to make arm fit |
41 | // into deck holder |
34e9f480 |
42 | sonar_holder_depth = deck_depth - 0.7875; |
8ca271e9 |
43 | |
bc750455 |
44 | deck_holder_length = sonar_holder_depth * 2 + deck_depth + 15; |
74f8c088 |
45 | |
8b84f6f3 |
46 | module sonars(){ |
47 | translate([between_sonar_centers / 2, 0, 0]){ |
48 | cylinder(r = sonar_radius, h = sonar_height);} |
49 | // for the variance with which the physical sonar cylinders are placed |
50 | translate([between_sonar_centers / 2 - between_sonar_centers_variance, 0, 0]){ |
51 | cylinder(r = sonar_radius, h = sonar_height); |
52 | translate([0, -sonar_radius, 0]){ |
53 | cube([between_sonar_centers_variance, sonar_diameter, sonar_height]);}} |
54 | translate([-between_sonar_centers / 2, 0, 0]){ |
55 | cylinder(r = sonar_radius, h = sonar_height);}} |
74f8c088 |
56 | |
8b84f6f3 |
57 | module sonar_holder(){ |
34e9f480 |
58 | elbow_length = deck_depth - 0.5; |
7888bdfb |
59 | rounded_corner_radius = buffer; |
49bffb72 |
60 | difference(){ |
61 | cube([sonar_holder_length, sonar_holder_width, sonar_holder_depth]); |
62 | translate([sonar_holder_length / 2, sonar_holder_width / 2, -0.05]){ |
7888bdfb |
63 | sonars();} |
64 | translate([sonar_holder_length - rounded_corner_radius, |
65 | sonar_holder_width - rounded_corner_radius, |
66 | 0]){ |
67 | corner_rounder(rounded_corner_radius, sonar_holder_depth);}} |
8b84f6f3 |
68 | translate([sonar_holder_length, 0, 0]){ |
34e9f480 |
69 | cube([elbow_length, deck_depth, sonar_holder_depth]); |
8b84f6f3 |
70 | translate([elbow_length, 0, 0]){ |
71 | linear_extrude(height = sonar_holder_depth){ |
34e9f480 |
72 | polygon([[ 0, 0], |
8b84f6f3 |
73 | [sonar_holder_depth, 0], |
74 | [sonar_holder_depth, sonar_holder_width / 2], |
34e9f480 |
75 | [ 0, |
76 | sonar_holder_width / 2 + sonar_holder_depth]]);} |
8b84f6f3 |
77 | translate([0, (sonar_holder_width + sonar_holder_depth) / 2, 0]){ |
78 | cube([sonar_holder_depth / 2, |
79 | (sonar_holder_width - sonar_holder_depth) / 2 + 0.8, |
80 | sonar_holder_depth]);} |
60061640 |
81 | translate([-1.7, sonar_holder_width + 0.8, 0]){ |
8b84f6f3 |
82 | linear_extrude(height = sonar_holder_depth){ |
34e9f480 |
83 | polygon([[ 0, 0], |
8b84f6f3 |
84 | [sonar_holder_depth / 2 + 1.7, 4], |
85 | [sonar_holder_depth / 2 + 1.7, 0]]);}}}}} |
49bffb72 |
86 | |
74f8c088 |
87 | module deck_holder(){ |
be16f419 |
88 | deck_holder_width = sonar_holder_width - deck_depth; |
4390b08c |
89 | deck_holder_height = sonar_holder_depth * 2 + deck_depth; |
bc750455 |
90 | linear_extrude(height = deck_holder_width){ |
91 | difference(){ |
4390b08c |
92 | square([deck_holder_length, deck_holder_height]); |
bc750455 |
93 | translate([sonar_holder_depth, sonar_holder_depth]){ |
94 | square(deck_depth);} |
4390b08c |
95 | translate([deck_holder_height, sonar_holder_depth]){ |
96 | square([deck_holder_length - (deck_holder_height), deck_depth]);}}} |
97 | translate([deck_holder_length - oshw_dy * 0.05, 0, deck_holder_width / 2]) |
98 | scale([0.1, 1, 0.1]) |
99 | rotate(v = [1, 0, 0], a = 90) |
100 | rotate(90) |
101 | linear_extrude(height = 0.5) |
102 | oshw(); |
103 | translate([deck_holder_length - oshw_dy * 0.05, |
104 | deck_holder_height + 0.5, |
105 | deck_holder_width / 2]) |
106 | rotate(v = [1, 0, 0], a = 90) |
107 | rotate(90) |
108 | scale([0.1, 0.1, 1]) |
109 | linear_extrude(height = 0.5) |
110 | oshw();} |
74f8c088 |
111 | |
7888bdfb |
112 | module corner_rounder_2d(radius){ |
113 | difference (){ |
114 | square (radius); |
115 | circle (radius);}} |
116 | |
117 | module corner_rounder(radius, height){ |
118 | linear_extrude(height = height){ |
119 | corner_rounder_2d(radius);}} |
120 | |
be16f419 |
121 | deck_holder(); |
7888bdfb |
122 | |
8b84f6f3 |
123 | translate([0, sonar_holder_depth * 2 + deck_depth + 2, 0]){ |
124 | sonar_holder();} |