From 077e5cbedbee7e7a7e5f01da2f2f84c0d0bfc423 Mon Sep 17 00:00:00 2001
From: Martin Preuss <martin@aquamaniac.de>
Date: Thu, 11 Dec 2025 22:48:56 +0100
Subject: [PATCH] added first enclosure for n28.

---
 avr/devices/n28/0BUILD         |   1 +
 avr/devices/n28/enclosure.scad | 120 +++++++++++++++++++++++++++++++++
 2 files changed, 121 insertions(+)
 create mode 100644 avr/devices/n28/enclosure.scad

diff --git a/avr/devices/n28/0BUILD b/avr/devices/n28/0BUILD
index 472c33c..aea5b98 100644
--- a/avr/devices/n28/0BUILD
+++ b/avr/devices/n28/0BUILD
@@ -10,6 +10,7 @@
   <extradist>
     defs.asm
     README
+    enclosure.scad
   </extradist>
 
 </gwbuild>
diff --git a/avr/devices/n28/enclosure.scad b/avr/devices/n28/enclosure.scad
new file mode 100644
index 0000000..9c4dd78
--- /dev/null
+++ b/avr/devices/n28/enclosure.scad
@@ -0,0 +1,120 @@
+$fn = 50;
+
+width = 22;
+length = 117;
+height = 28;
+
+corner_radius = 2;
+wall_thickness = 2;
+post_diameter = 8;
+post_height = 4;
+
+hole_diameter = 3;
+lid_thickness = 2;
+lid_lip = 1 ;
+lid_tolerance = .5;
+
+
+module posts(x, y, z, h, r){
+    translate([x, y, z])
+      cylinder(r = r, h = h);
+
+    translate([-x, y, z])
+      cylinder(r = r, h = h);
+
+    translate([-x, -y, z])
+      cylinder(r = r, h = h);
+
+    translate([x, -y, z])
+      cylinder(r = r, h = h);
+}
+
+
+
+difference() {
+    // box
+    hull() {
+        posts(
+            x=(width/2 - corner_radius), 
+            y=(length/2 - corner_radius),
+            z=0,
+            h=height,
+            r=corner_radius);
+    }
+    
+    // hollow
+    hull() {
+        posts(
+            x=(width/2 - corner_radius - wall_thickness), 
+            y=(length/2 - corner_radius - wall_thickness),
+            z=wall_thickness,
+            h=height,
+            r=corner_radius);
+    }
+
+    // lip inside box
+    hull() {
+        posts(
+            x=(width/2 - corner_radius - lid_lip), 
+            y=(length/2 - corner_radius - lid_lip),
+            z=(height - lid_thickness),
+            h=(lid_thickness + 1),
+            r=corner_radius);
+    }
+
+    // ventilation slits left 1
+    for(i = [(wall_thickness+post_height+2):2:(height-6)]) {
+        translate([(-width/2)-wall_thickness, (-length/2)+25, i])
+            cube([10, length/4, 1], center=true);
+    }
+
+    // ventilation slits left 2
+    for(i = [(wall_thickness+post_height+2):2:(height-6)]) {
+        translate([(-width/2)-wall_thickness, (length/2)-25, i])
+            cube([10, length/4, 1], center=true);
+    }
+
+    // ventilation slits right 1
+    for(i = [(wall_thickness+post_height+2):2:(height-6)]) {
+        translate([(width/2)-wall_thickness, (-length/2)+25, i])
+            cube([10, length/4, 1], center=true);
+    }
+
+    // ventilation slits right 2
+    for(i = [(wall_thickness+post_height+2):2:(height-6)]) {
+        translate([(width/2)-wall_thickness, (length/2)-25, i])
+            cube([10, length/4, 1], center=true);
+    }
+
+    // network connector hole 1
+    translate([0, (length/2), post_height+wall_thickness+2+8])
+        cube([16, 21, 15], center=true);
+
+    // network connector hole 2
+    translate([0, (-length/2), post_height+wall_thickness+2+8])
+        cube([16, 21, 15], center=true);
+
+    // sensor hole
+    translate([(width/2), -7, post_height+wall_thickness+2+8])
+        cube([5, 10, 7], center=true);
+
+}
+
+
+// support posts for pcb
+difference() {
+    translate([0, length/4, wall_thickness])
+        cylinder(r = post_diameter/2, h = post_height);
+
+    translate([0, length/4, wall_thickness])
+        cylinder(r = hole_diameter/2, h = post_height+3);
+}
+
+
+difference() {
+    translate([0, -length/4, wall_thickness])
+        cylinder(r = post_diameter/2, h = post_height);
+
+    translate([0, -length/4, wall_thickness])
+        cylinder(r = hole_diameter/2, h = post_height+3);
+}