refactored files add some new ones

2026-02-23 20:46:02 +13:00
parent ade276e1ec
commit 3a634cdb18
5 changed files with 293 additions and 0 deletions
--- a/modules/bidirectional_idt.scad
+++ b/modules/bidirectional_idt.scad
@@ -0,0 +1,150 @@
+include <idt.scad>
+include <bond_pad.scad>
+
+// creates the input and output idts
+// [TODO] clean this
+module bi_directional_idt(
+    c, 
+    f, 
+    n_fingers, 
+    distance = 100, 
+    finger_length = 50, 
+    gap = 0, 
+    thickness = 0, 
+    impedance = 50,
+
+    // bond pad prams
+    has_bond_pads = false,
+    bond_pad_leg_length = 0.00005, 
+    bond_pad_leg_width = 0.00001875, 
+    bond_pad_size = 0.000075,
+    bond_pad_angle = 45,
+    bond_pad_bond_pad_shape = "square",
+
+    // id number prams
+    id_number = 0,
+    has_id = false,
+    id_flip_dir = [1, 1, 1],
+    // extra
+    post_scale = 1,
+    echo_stats = false,
+    center = false
+) {
+        
+
+    lambda = c/f * post_scale;
+    // dont worry about these magic fractions
+    length_of_input = n_fingers*lambda+1.74*lambda;
+
+
+    should_be_centered = center ? 1 : 0;
+    center_offset_y = length_of_input + distance * lambda/2;
+    center_offset_x = finger_length*lambda/2 + gap/2 + thickness;
+
+    translate([-center_offset_x * should_be_centered, -center_offset_y * should_be_centered, 0]) {
+
+    if (has_id) {
+        color([255/255, 0/255, 255/255])
+        translate([finger_length*lambda/2, has_bond_pads ? -(bond_pad_leg_length * post_scale * cos(bond_pad_angle)) : -lambda*finger_length/2, 0])
+        scale(id_flip_dir)
+        text(str(id_number), size=id_text_size, halign="center");
+    }
+    
+    
+
+    // echo(str("lambda_scale = ", post_scale));
+    delay_line(lambda, n_fingers, finger_length, gap, thickness);
+
+
+    color([0/255, 255/255, 128/255]) {
+        translate([0, distance*lambda+length_of_input, 0]) {
+            delay_line(lambda, n_fingers, finger_length, gap, thickness);
+        }
+    }
+
+    // near ori
+    rotate([0, 0, -90]) {
+        if (has_bond_pads) {
+            color([255/255, 255/255, 255/255]) {
+                bond_pad(
+                    leg_length_tweak = lambda/4,
+                    leg_width=c/f/4, 
+                    leg_length=length(
+                        [0,0,0], 
+                        [bond_pad_leg_length, bond_pad_leg_length, 0]
+                    ), 
+                    leg_angle = -bond_pad_angle,
+                    size = bond_pad_size, 
+                    post_scale=scale_unit
+                );
+            }
+        }
+    }
+    // near side
+    
+    translate([lambda*finger_length+gap+thickness*2+lambda, 0, 0]) {
+        rotate([0, 0, -90]) {
+                if (has_bond_pads) {
+                    bond_pad(
+                        leg_length_tweak = lambda/5,
+                        leg_width=c/f/4, 
+                        leg_length=length(
+                            [0,0,0], 
+                            [bond_pad_leg_length, bond_pad_leg_length, 0]
+                        ), 
+                        leg_angle = bond_pad_angle,
+                        size = bond_pad_size, 
+                        post_scale=scale_unit
+                    );
+            }
+        }
+    }
+
+    // far side
+    translate([0, length_of_input+distance*lambda+length_of_input, 0]) {   
+            rotate([0, 0, 90]) {                    
+                if (has_bond_pads) {
+                    bond_pad(
+                        leg_length_tweak = lambda/5,
+                        leg_width=c/f/4, 
+                        leg_length=length(
+                            [0,0,0], 
+                            [bond_pad_leg_length, bond_pad_leg_length, 0]
+                        ), 
+                        leg_angle = bond_pad_angle,
+                        size = bond_pad_size, 
+                        post_scale=scale_unit
+                    );
+                }
+            }
+            // furthest side
+            translate([lambda*finger_length+gap+thickness*2+lambda, 0, 0]) {
+                rotate([0, 0, 90]) {                    
+                        if (has_bond_pads) {
+                            bond_pad(
+                                leg_length_tweak = lambda/4,
+                                leg_width=c/f/4, 
+                                leg_length=length(
+                                    [0,0,0], 
+                                    [bond_pad_leg_length, bond_pad_leg_length, 0]
+                                ), 
+                                leg_angle = -bond_pad_angle,
+                                size = bond_pad_size, 
+                                post_scale=scale_unit
+                            );
+                    }
+                }
+            }
+    } 
+    }
+
+
+    if (echo_stats) {
+        echo("===== DELAY LINE IDT INFO ===== ");
+        echo(str("lambda = ", lambda));
+        echo(str("min feature size lambda/4 = ", lambda/4));
+        echo(str("impedance = ", impedance));
+        echo(str("total capacitance = ", 1/(2*PI*f*impedance)));
+        echo("===== DELAY LINE IDT INFO ===== ");
+    }
+}