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 // 3/16 inch in mm deck_depth = 4.7625;
18 // 1/4 inch in mm = 6.35
19 // subtract a little to be a squeeze fit
20 deck_depth
= 4.7625 - 0.4;
21 // sonar sensor measurements taken with calipers:
22 // 10.82 in between, 42.33 outside, 15.82 diameter
23 // measured diameter of 15.82 with calipers,
24 // but when printed ends up being too small, so add some
25 sonar_diameter
= 15.82 + 0.4;
26 sonar_radius
= sonar_diameter
/ 2;
28 between_sonar_centers
= sonar_diameter
+ 10.82;
29 // the sonar cylinders are placed on the pcb at slightly different positions
30 // from one sensor to the next, so this allows for that variance.
31 between_sonar_centers_variance
= 2;
32 // keep at least this much plastic surrounding the sonar cylinder on all sides
34 sonar_holder_length
= buffer
+ between_sonar_centers
+ sonar_diameter
+ buffer
;
35 sonar_holder_width
= buffer
+ sonar_diameter
+ buffer
;
36 // sonar_holder_depth is deck_depth minus a little bit to make arm fit
38 sonar_holder_depth
= deck_depth
- 0.7875;
40 deck_holder_length
= sonar_holder_depth
* 2 + deck_depth
+ 15;
43 translate([between_sonar_centers
/ 2, 0, 0]){
44 cylinder(r
= sonar_radius
, h
= sonar_height
);}
45 // for the variance with which the physical sonar cylinders are placed
46 translate([between_sonar_centers
/ 2 - between_sonar_centers_variance
, 0, 0]){
47 cylinder(r
= sonar_radius
, h
= sonar_height
);
48 translate([0, -sonar_radius
, 0]){
49 cube([between_sonar_centers_variance
, sonar_diameter
, sonar_height
]);}}
50 translate([-between_sonar_centers
/ 2, 0, 0]){
51 cylinder(r
= sonar_radius
, h
= sonar_height
);}}
53 module
sonar_holder(){
54 elbow_length
= deck_depth
- 0.5;
56 cube([sonar_holder_length
, sonar_holder_width
, sonar_holder_depth
]);
57 translate([sonar_holder_length
/ 2, sonar_holder_width
/ 2, -0.05]){
59 translate([sonar_holder_length
, 0, 0]){
60 cube([elbow_length
, deck_depth
, sonar_holder_depth
]);
61 translate([elbow_length
, 0, 0]){
62 linear_extrude(height
= sonar_holder_depth
){
64 [sonar_holder_depth
, 0],
65 [sonar_holder_depth
, sonar_holder_width
/ 2],
67 sonar_holder_width
/ 2 + sonar_holder_depth
]]);}
68 translate([0, (sonar_holder_width
+ sonar_holder_depth
) / 2, 0]){
69 cube([sonar_holder_depth
/ 2,
70 (sonar_holder_width
- sonar_holder_depth
) / 2 + 0.8,
71 sonar_holder_depth
]);}
72 translate([-1.7, sonar_holder_width
+ 0.8, 0]){
73 linear_extrude(height
= sonar_holder_depth
){
75 [sonar_holder_depth
/ 2 + 1.7, 4],
76 [sonar_holder_depth
/ 2 + 1.7, 0]]);}}}}}
79 deck_holder_width
= sonar_holder_width
- deck_depth
;
80 linear_extrude(height
= deck_holder_width
){
82 square([deck_holder_length
, sonar_holder_depth
* 2 + deck_depth
]);
83 translate([sonar_holder_depth
, sonar_holder_depth
]){
85 translate([sonar_holder_depth
* 2 + deck_depth
, sonar_holder_depth
]){
86 square([deck_holder_length
- (sonar_holder_depth
* 2 + deck_depth
),
90 translate([0, sonar_holder_depth
* 2 + deck_depth
+ 2, 0]){