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
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.
17 include
<oshw
-data
.scad
>
19 // 3/16 inch in mm deck_depth = 4.7625;
20 // 1/4 inch in mm = 6.35
21 // subtract a little to be a squeeze fit
22 deck_depth
= 4.7625 - 0.4;
23 // sonar sensor measurements taken with calipers:
24 // 10.82 in between, 42.33 outside, 15.82 diameter
25 // measured diameter of 15.82 with calipers,
26 // but when printed ends up being too small, so add some
27 sonar_diameter
= 15.82 + 0.4;
28 sonar_radius
= sonar_diameter
/ 2;
30 between_sonar_centers
= sonar_diameter
+ 10.82;
31 // the sonar cylinders are placed on the pcb at slightly different positions
32 // from one sensor to the next, so this allows for that variance.
33 between_sonar_centers_variance
= 2;
34 // keep at least this much plastic surrounding the sonar cylinder on all sides
36 sonar_holder_length
= buffer
+ between_sonar_centers
+ sonar_diameter
+ buffer
;
37 sonar_holder_width
= buffer
+ sonar_diameter
+ buffer
;
39 // 3/16 inch in mm deck_depth = 4.7625;
40 // 1/4 inch in mm = 6.35
41 // subtract a little to be a squeeze fit
42 deck_depth
= 4.7625 - 0.4;
43 // sonar sensor measurements taken with calipers:
44 // 10.82 in between, 42.33 outside, 15.82 diameter
45 // measured diameter of 15.82 with calipers,
46 // but when printed ends up being too small, so add some
47 sonar_diameter
= 15.82 + 0.4;
48 sonar_radius
= sonar_diameter
/ 2;
50 between_sonar_centers
= sonar_diameter
+ 10.82;
51 // the sonar cylinders are placed on the pcb at slightly different positions
52 // from one sensor to the next, so this allows for that variance.
53 between_sonar_centers_variance
= 2;
54 // keep at least this much plastic surrounding the sonar cylinder on all sides
56 sonar_holder_length
= buffer
+ between_sonar_centers
+ sonar_diameter
+ buffer
;
57 sonar_holder_width
= buffer
+ sonar_diameter
+ buffer
;
58 // sonar_holder_depth is deck_depth minus a little bit to make arm fit
60 sonar_holder_depth
= deck_depth
- 0.7875;
62 deck_holder_length
= sonar_holder_depth
* 2 + deck_depth
+ 15;
64 module
deck_holder() {
65 deck_holder_width
= sonar_holder_width
- deck_depth
;
66 deck_holder_height
= sonar_holder_depth
* 2 + deck_depth
;
67 linear_extrude(height
= deck_holder_width
) {
69 square([deck_holder_length
, deck_holder_height
]);
70 translate([sonar_holder_depth
- 0.15, sonar_holder_depth
- 0.15]) {
71 square(deck_depth
+ 0.3); }
72 translate([deck_holder_height
, sonar_holder_depth
- 0.3]) {
73 square([deck_holder_length
- (deck_holder_height
),
74 deck_depth
+ 0.6]); } } }
75 translate([deck_holder_length
- oshw_dy
* 0.05, 0, deck_holder_width
/ 2])
77 rotate(v
= [1, 0, 0], a
= 90)
79 linear_extrude(height
= 0.5)
81 translate([deck_holder_length
- oshw_dy
* 0.05,
82 deck_holder_height
+ 0.5,
83 deck_holder_width
/ 2])
84 rotate(v
= [1, 0, 0], a
= 90)
87 linear_extrude(height
= 0.5)