Case: mount the display the right way up

The glass is 4.4 mm off-centre on the display PCB. Turning the display
180 degrees so the text reads correctly moved the glass partly behind the
window edge. New disp_rotated option (default on) moves the bezel bosses
to match. Only the bezel changes.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

case/README.md

@@ -61,6 +61,12 @@ check these against yours and change the values at the top of
 - `usb_pos`: where the micro-USB port is along the D1's back edge (38 mm from
   the jack side is a guess based on the UNO layout). Also check `jack_pos`.
 
+- `disp_rotated`: the glass is off-centre on the display's PCB, so the bezel
+  depends on which way up the display is mounted. `true` (the default) is the
+  orientation the display reads correctly in: turned 180° from the
+  datasheet's front view, with the jumper header on the left seen from the
+  front.
+
 If only the display is off, it's enough to reprint the bezel.
 
 ## Changing the design

case/vfd-case.scad

@@ -35,8 +35,8 @@ top_margin = 4;         // bezel above the display's top edge (along the panel)
 disp_w = 190;
 disp_h = 64;
 disp_hole_inset = 4;    // hole centres from the PCB edges (182 x 56 spacing)
-glass_x0 = 3.0;         // glass left edge from PCB left edge (front view)
+glass_x0 = 3.0;         // glass left edge from PCB left edge (datasheet front view)
-glass_y0 = 7.85;        // glass bottom edge from PCB bottom edge
+glass_y0 = 7.85;        // glass bottom edge from PCB bottom edge (datasheet front view)
 glass_w = 175.2;
 glass_h = 48.3;
 glass_depth = 12.0;     // glass front face to PCB front face
@@ -44,6 +44,9 @@ glass_gap = 0.5;        // air gap between bezel and glass (datasheet asks for o
 pcb_t = 1.6;
 disp_back = 11;         // components behind the display PCB
 disp_raise = 14;        // PCB bottom edge, measured along the panel from the bottom
+disp_rotated = true;    // display turned 180 deg from the datasheet's front view
+                        // (jumper header on the left seen from the front); the
+                        // glass is off-centre, so this moves the bosses 8.8 mm
 
 /* [Window] */
 win_w = 156;
@@ -76,7 +79,10 @@ board_comp_h = 10;      // tallest part on the board (dummy for the collision ch
 $fn = 48;
 
 // ---------- derived ----------
-gx_c = glass_x0 + glass_w / 2;                       // glass centre from PCB left
+// glass position from the PCB's bottom-left corner as mounted (front view)
+gl_x = disp_rotated ? disp_w - glass_x0 - glass_w : glass_x0;
+gl_y = disp_rotated ? disp_h - glass_y0 - glass_h : glass_y0;
+gx_c = gl_x + glass_w / 2;                            // glass centre from PCB left
 inner_w = 2 * (max(gx_c, disp_w - gx_c) + 1.5);       // window centred, 1.5 mm side clearance
 outer_w = inner_w + 2 * wall;
 disp_x0 = inner_w / 2 - gx_c;                         // PCB left edge, x
@@ -85,7 +91,7 @@ height = z_top_in + wall;
 n_bezel_in = lip + bezel_t;                           // bezel inner face (local N)
 n_glass = n_bezel_in + glass_gap;
 n_pcb = n_glass + glass_depth;
-win_s = disp_raise + glass_y0 + glass_h / 2;          // window centre along the panel
+win_s = disp_raise + gl_y + glass_h / 2;          // window centre along the panel
 board_x0 = inner_w / 2 - board_w / 2;
 board_conn_y = depth - wall - board_gap;              // y of the board's connector edge
 pcb_top_z = standoff_h + pcb_t;
@@ -231,7 +237,7 @@ module tie_anchor() {
 // ---------- dummies for the preview and the collision checks ----------
 module display_dummy() {
     panel() {
-        translate([disp_x0 + glass_x0, disp_raise + glass_y0, n_glass + 0.01])
+        translate([disp_x0 + gl_x, disp_raise + gl_y, n_glass + 0.01])
             cube([glass_w, glass_h, glass_depth - 0.02]);
         translate([disp_x0, disp_raise, n_pcb + 0.01]) difference() {
             cube([disp_w, disp_h, pcb_t + disp_back]);