1include <BOSL/constants.scad>
2use <BOSL/masks.scad>
3
4// Start config
5// Pi Board
6pi_board_size = [51,21]; //mm
7pi_board_screw_holes_center_from_board_edge_distance = [3.7/2/*3.7 is the difference between screen and pi pcb height 21-24.7 */+4.8,2]; //mm
8pi_board_screw_holes_diameter = 2.1; //mm
9pi_board_padding = 1; //mm
10
11// Screen
12screen_pcb_size = [24.7,27,13.3]; //mm (+- 0.2) 13.3mm are pin headers.
13screen_pcb_screw_holes_center_from_board_edge_distance = 2.1; //mm
14screen_pcb_screw_holes_diameter=2.8; //mm
15screen_pcb_screw_holes_spacing=[20.5,23]; //mm
16active_screen_area = [24.7,16.9,3.5]; //mm (old: 13.86)
17active_screen_area_offset_from_corner = [0,5.08]; //mm
18
19// MEMS Package (HCLGA)
20mems_microphone_package_size = [3,4,1.06]; //mm https://cdn-learn.adafruit.com/assets/assets/000/049/977/original/MP34DT01-M.pdf
21mems_microphone_position_offset_from_corner = [11.5,pi_board_padding+screen_pcb_size.x/2-mems_microphone_package_size.y/2,0]; //mm
22
23
24
25// Screws
26m2_screw_nut_size = [5,5,1.6];
27
28// Misc
29walls_thickness = 2; //mm
30rounding_radius=1.5; //mm
31
32resolution = 80;
33// End config
34
35// Modules
36module sector(radius, angles, fn = resolution) {
37 r = radius / cos(180 / fn);
38 step = -360 / fn;
39
40 points = concat([[0, 0]],
41 [for(a = [angles[0] : step : angles[1] - 360])
42 [r * cos(a), r * sin(a)]
43 ],
44 [[r * cos(angles[1]), r * sin(angles[1])]]
45 );
46
47 difference() {
48 circle(radius, $fn = fn);
49 polygon(points);
50 }
51}
52
53module arc(radius, angles, width = 1, fn = resolution) {
54 difference() {
55 sector(radius + width, angles, fn);
56 sector(radius, angles, fn);
57 }
58}
59
60// Modeling
61difference(){
62// Body
63cube(size=[pi_board_size.x+2*pi_board_padding,screen_pcb_size.x+2*pi_board_padding,walls_thickness]);
64 // Fillet Edge
65 fillet_mask_z(l=walls_thickness, r=rounding_radius, align=V_UP, $fn=resolution);
66
67 translate([pi_board_size.x+2*pi_board_padding,screen_pcb_size.x+2*pi_board_padding,0])
68 fillet_mask_z(l=walls_thickness, r=rounding_radius, align=V_UP, $fn=resolution);
69
70 translate([pi_board_size.x+2*pi_board_padding,0,0]) fillet_mask_z(l=walls_thickness, r=rounding_radius, align=V_UP, $fn=resolution);
71
72 translate([0,screen_pcb_size.x+2*pi_board_padding,0]) fillet_mask_z(l=walls_thickness, r=rounding_radius, align=V_UP, $fn=resolution);
73 // MEMS Package (HCLGA)
74 translate(mems_microphone_position_offset_from_corner) cube(size=[mems_microphone_package_size.x,mems_microphone_package_size.y,walls_thickness]);
75 // Screws + Nuts
76 translate([pi_board_screw_holes_center_from_board_edge_distance.y+pi_board_padding,pi_board_screw_holes_center_from_board_edge_distance.x+pi_board_padding,0]) cylinder(walls_thickness,pi_board_screw_holes_diameter/2,pi_board_screw_holes_diameter/2,$fn=resolution);
77
78 translate([pi_board_screw_holes_center_from_board_edge_distance.y+pi_board_padding,pi_board_screw_holes_center_from_board_edge_distance.x+pi_board_padding,walls_thickness-m2_screw_nut_size.z]) cylinder(m2_screw_nut_size.z,m2_screw_nut_size.x/2,m2_screw_nut_size.x/2,$fn=6);
79
80 translate([pi_board_screw_holes_center_from_board_edge_distance.y+pi_board_padding,screen_pcb_size.x-pi_board_screw_holes_center_from_board_edge_distance.x+pi_board_padding,0]) cylinder(walls_thickness,pi_board_screw_holes_diameter/2,pi_board_screw_holes_diameter/2,$fn=resolution);
81
82 translate([pi_board_screw_holes_center_from_board_edge_distance.y+pi_board_padding,screen_pcb_size.x-pi_board_screw_holes_center_from_board_edge_distance.x+pi_board_padding,walls_thickness-m2_screw_nut_size.z]) cylinder(m2_screw_nut_size.z,m2_screw_nut_size.x/2,m2_screw_nut_size.x/2,$fn=6);
83
84 translate([pi_board_size.x-pi_board_screw_holes_center_from_board_edge_distance.y+pi_board_padding,pi_board_screw_holes_center_from_board_edge_distance.x+pi_board_padding,0]) cylinder(walls_thickness,pi_board_screw_holes_diameter/2,pi_board_screw_holes_diameter/2,$fn=resolution);
85
86 translate([pi_board_size.x-pi_board_screw_holes_center_from_board_edge_distance.y+pi_board_padding,pi_board_screw_holes_center_from_board_edge_distance.x+pi_board_padding,walls_thickness-m2_screw_nut_size.z]) cylinder(m2_screw_nut_size.z,m2_screw_nut_size.x/2,m2_screw_nut_size.x/2,$fn=6);
87
88 translate([pi_board_size.x-pi_board_screw_holes_center_from_board_edge_distance.y+pi_board_padding,screen_pcb_size.x-pi_board_screw_holes_center_from_board_edge_distance.x+pi_board_padding,0]) cylinder(walls_thickness,pi_board_screw_holes_diameter/2,pi_board_screw_holes_diameter/2,$fn=resolution);
89
90 translate([pi_board_size.x-pi_board_screw_holes_center_from_board_edge_distance.y+pi_board_padding,screen_pcb_size.x-pi_board_screw_holes_center_from_board_edge_distance.x+pi_board_padding,walls_thickness-m2_screw_nut_size.z]) cylinder(m2_screw_nut_size.z,m2_screw_nut_size.x/2,m2_screw_nut_size.x/2,$fn=6);
91 }