From ce3a147ba6f4283eed8e7095c894a678ed50df2c Mon Sep 17 00:00:00 2001
From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Tue, 17 Oct 2023 22:32:50 +0100
Subject: [PATCH] digispark-with-cable: wip progress

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
---
 digispark-with-cable.scad | 27 ++++++++++++++++++++++++++-
 1 file changed, 26 insertions(+), 1 deletion(-)

diff --git a/digispark-with-cable.scad b/digispark-with-cable.scad
index 617abea..a489574 100644
--- a/digispark-with-cable.scad
+++ b/digispark-with-cable.scad
@@ -41,6 +41,10 @@ strain_pitch_along = 10;
 strain_groove_d = 2;
 strain_groove_w = 3;
 
+cover_strap_c_d_y = 5.5; // from front of board
+cover_registration_sz_y = 2;
+cover_registration_sz_z = 3;
+
 cable_space_z = 6;
 cable_dia = 5;
 bottom_floor_th = 1.5;
@@ -53,6 +57,8 @@ cover_ceil_th = 0.9;
 
 // calculated
 
+strap_w = strain_w;
+
 top_top_z = usb_wall_h;
 top_base_z = -board_th;
 bottom_base_z = top_base_z - cable_space_z - bottom_floor_th;;
@@ -71,9 +77,12 @@ cover_top_z  = top_top_z + cover_ceil_th;
 top_side_wall_x = +board_w/2 + side_wall_th;
 total_side_wall_x = top_side_wall_x + side_wall_th + side_x_gap;
 
+cover_registration_c_dy = -cover_strap_c_d_y - strap_w/2
+  - side_wall_th - cover_registration_sz_y/2;
+
 module BothSides(){
   for (m=[0,1]) {
-    mirror([m,0]) {
+    mirror([m,0,0]) {
       children();
     }
   }
@@ -117,6 +126,21 @@ module TopMainWallsPlan() {
 	     [ +board_w/2 + side_wall_th,            total_y_min ]);
 }
 
+module CoverRegistrations(){
+  linextr_y_xz(cover_registration_c_dy - strap_w/2,
+	       cover_registration_c_dy + strap_w/2) {
+    difference(){
+      rectfromto([ -total_side_wall_x,
+		          cover_wall_bot_z - cover_registration_sz_z  ],
+		 [ +total_side_wall_x, cover_top_z ]);
+      hull(){
+	TopElevationForCutout();
+	translate([0, -20]) TopElevationForCutout();
+      }
+    }
+  }
+}
+
 module Top(){ ////toplevel
   difference(){
     union(){
@@ -194,6 +218,7 @@ module CoverMainElevation(){
 module Cover(){ ////toplevel
   linextr_y_xz(main_y_min, front_y_max)
     CoverMainElevation();
+  CoverRegistrations();
 }
 
 module BottomDemo(){ ////toplevel
-- 
2.30.2