sma rigid with possibility of embedded USB sound card
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Pierre Lecomte
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@ -15,9 +15,8 @@ Also, Python codes are provided for the calibration of the Spherical Microphone
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# opensCAD designs
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The designs are in the `cad` folder:
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- `sma_open.scad` for open SMA configuration with cylindrical shaped microphones,
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- `sma_rigid.scad` for rigid SMA configuration with cylindrical shaped microphones,
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- `sma_rigid_mchstreamer.scad` for rigid SMA configuration with digital MEMS microphone and embedded USB sound card.
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- `sma_open.scad` for open SMA configuration,
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- `sma_rigid.scad` for rigid SMA configuration,
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Examples of SMA configurations are provide in `.json` files.
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See the documentation in `.scad` files to create or customize a SMA design.
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@ -1,10 +1,8 @@
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/*
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* Rigid SMA design for cylindrical microphone capsules
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* Rigid SMA design
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* Copyright 2023 Pierre Lecomte - sekisushai@gmail.com
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*/
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include <threads.scad>
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/*
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The rigid SMA is composed of two hemispherical shells to render separately for 3D printing.
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*/
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@ -19,7 +17,7 @@ res = 32;
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/*[ Array parameters ]*/
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// sphere radius (mm):
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r = 60;
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r = 80;
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// shell thickness (mm):
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e = 6;
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@ -30,6 +28,12 @@ theta = [0, 90, 90, 90, 90, 180, 54.7356, 54.7356, 54.7356, 54.7356, 125.264, 12
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// microphone azimuth coordinates (°):
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phi = [0, 0, 90, 180, 270, 0, 45, 135, 225, 315, 45, 135, 225, 315];
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// microphone type
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mic_type = "1/4"; // [1/4:Quarter_Inch, PDM:PDM MEMS]
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// include USB sound card (only for digital MEMS mics)
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usb_card = true;
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/* the microphone array can be rotated to be in accordance with the array cut and mic stand position
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*/
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// microphones global rotation (°):
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@ -69,6 +73,7 @@ The mic stand threaded hole should be close to the passing cable hole. It's dire
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dir_thread = [13, 0];
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// DO NOT EDIT BELOW HERE
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include <threads.scad>
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// Hollow sphere
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module hollow(r1=r-e, r2=r, fn1=$fn, fn2=$fn){
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@ -78,8 +83,7 @@ module hollow(r1=r-e, r2=r, fn1=$fn, fn2=$fn){
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}
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}
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// Torus for "joint torique" for B&K 1/4" mics
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// Torus for O-ring for 1/4" mics
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module b_k(){
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mirror([0,0,-1])
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rotate_extrude($fn=32){
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@ -91,12 +95,69 @@ square([3.55, 1.1*e]);
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}
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}
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module mics(){
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// Adafruit PDM MEMS breakout.
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// https://www.adafruit.com/product/3492
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module pdm_breakout(l=14-5, w=13-5){
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$fn=64;
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translate([-l/2,-w/2,-5]){
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// big condo
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linear_extrude(7){
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translate([l/2+4.5,w/2,0])
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square([3,4],center=true);
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}
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// small condo
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linear_extrude(5.75){
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translate([l/2+2.75,w/2,0])
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square([3,4],center=true);
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}
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// tiny resistor
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linear_extrude(5.5){
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translate([l/2-2.9,w/2+1,0])
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square([3,2],center=true);
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}
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// mic
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linear_extrude(6){
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translate([l/2,w/2-0.5,0])
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square([3.5,4.5],center=true);
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}
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linear_extrude(50){
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translate([l/2,w/2,0])
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circle(d=2);
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}
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// wires
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translate([0,0,5])
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linear_extrude(2){
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translate([l/2,w,0])
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square([l+4,2.5],center=true);
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}
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linear_extrude(5){
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difference(){
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minkowski(){
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square([l,w]);
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circle(2.6);
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}
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}
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}
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}
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}
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module mics(type){
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rotate(mics_rotate)
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for (i = [0 : len(theta)-1]){
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rotate([theta[i], 0, phi[i]])
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translate([0, 0, r-e+1]){
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if (type=="1/4")
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b_k();
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else
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pdm_breakout();
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translate([3,3,e-1.8])
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linear_extrude(3)
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text(str(i+1), size=3);
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@ -104,6 +165,45 @@ for (i = [0 : len(theta)-1]){
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}
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}
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module mchstreamer(){
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$fn=64;
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adj = 0.2; // adjustment
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// usb_cart dimensions
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w_usb = 40+adj;
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l_usb = 60+adj;
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h_usb = 15+adj;
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attach_l = 20;
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attach_w = 7.3 + adj;
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attach_h = 8.2+adj;
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rotate([0,-90,90])
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translate([r-l_usb-attach_l/2,-w_usb/2,-h_usb/2])
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union(){
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cube(size = [l_usb, w_usb, h_usb], center = false);
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plug_l = 20;
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plug_w = 12+adj;
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plug_h = 10.7+adj;
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translate([l_usb - plug_l/2, w_usb/2 - plug_w/2, 1.8+adj])
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cube(size = [1.5*plug_l, plug_w, plug_h], center =false);
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translate([l_usb - attach_l + 2, 1, 2.4+adj])
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attach();
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translate([l_usb - attach_l + 2, w_usb - attach_h -1, 2.4+adj])
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attach();
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translate([w_usb + 2, 0, 0])
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cube(size=[attach_l, w_usb, 2.7]);
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}
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module attach(){
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rotate([0, 90, 0]){
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translate([-attach_w/2, attach_h/2, attach_l/2]){
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union(){
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cube(size=[attach_w, attach_h, attach_l], center = true);
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cylinder(r=1.5, h=2*attach_l );
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}
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}}
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}
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}
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module bottom_shell(r1= r-e, r2=r-e/2, r3=r, delta=0.2) {
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union(){
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difference(){
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@ -155,8 +255,12 @@ cylinder(d=param[1]+0.2, h=param[0]+1, $fn=6);
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}
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module attach() {
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rotate([(angle_min+angle_max)/2,0,hole_phi_offset])
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rotate([(angle_min+angle_max)/2,0,hole_phi_offset]){
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if (usb_card==false)
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cylinder(d=d_hole, h=100);
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else
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mchstreamer();
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}
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rotate([(angle_min+angle_max)/2 + dir_thread[0],0, hole_phi_offset + dir_thread[1]])
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translate([0,0,(r-3*e)])
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render()
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@ -181,7 +285,7 @@ difference(){
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bottom_shell();
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attach();
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vis_all();
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mics();
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mics(mic_type);
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}
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}
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@ -189,7 +293,7 @@ module top_shell_all(){
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difference(){
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top_shell();
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attach();
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mics();
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mics(mic_type);
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vis_all();
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}
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}
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