From 26e6cec586e9c27643a4f238523930c8b9e3cc6d Mon Sep 17 00:00:00 2001
From: Jan Huwald <jh@sotun.de>
Date: Tue, 11 Feb 2014 11:50:19 +0100
Subject: add toy model of the backplane

backplane_pcb - only the pcb, later with holes
backplane_populated - pcb and connectors

diff --git a/backplane.scad b/backplane.scad
new file mode 100644
index 0000000..532885b
--- /dev/null
+++ b/backplane.scad
@@ -0,0 +1,37 @@
+include <parameters.scad>
+
+module hdd_connector(w,h,d) {
+      difference() {
+        cube([w, d, h]);
+	translate([1, 2, 1])
+	  cube([w - 2, d, h - 2]);
+      }
+}
+
+
+// board
+module backplane_pcb() {
+  color("sienna")
+    cube([backplane_width, backplane_thickness, backplane_height]);
+}
+
+module backplane_populated() {
+  backplane_pcb();
+
+  // front connector (power + data)
+  color("darkgrey")
+    translate([backplane_con_hoffset, 0, backplane_con_voffset])
+      mirror([0, 1, 0]) {
+          hdd_connector(backplane_con_width/ 3 * 2 + 1, backplane_con_height, backplane_con_depth);
+        translate([backplane_con_width / 3 * 2, 0, 0])
+          hdd_connector(backplane_con_width / 3 * 1, backplane_con_height, backplane_con_depth);
+      }
+
+  // back connector (data)
+  translate([backplane_con_hoffset + backplane_con_width / 3 * 2,
+             backplane_thickness, backplane_con_voffset])
+    mirror([0, 1, 0]) rotate([90, 0, 0])
+      hdd_connector(backplane_con_width / 3 * 1, backplane_con_height, backplane_con_depth);
+}
+
+backplane_populated();
\ No newline at end of file
diff --git a/parameters.scad b/parameters.scad
index a1f1b2e..6fad0e7 100644
--- a/parameters.scad
+++ b/parameters.scad
@@ -1,6 +1,6 @@
 // size of the array
 num_hdd_x = 4;
-num_hdd_y = 3;
+num_hdd_y = 5;
 
 // space above hdd available for air flow
 cooling_height = 10;
@@ -11,12 +11,29 @@ bar_thickness = 10;
 // length hdd is standing out to be grabbed
 hdd_standout = 25;
 
+// dimensions of the backplane PCB
+backplane_width  = 70;
+backplane_height = 30;
+backplane_thickness = 1.6;
+
+// offsets of the backplane relative to the hdd
+backplane_hoffset = -(bar_thickness - 2);
+backplane_voffset = -(bar_thickness - 2);
+
+// display only: dimensions and offsets of the SATA connector relative
+// to the backplane
+backplane_con_width = 45;
+backplane_con_height = 5;
+backplane_con_depth = 10;
+backplane_con_hoffset = 5 - backplane_hoffset;
+backplane_con_voffset = 15;
+
 // outer diameter of thread rod and nut used for support
 rod_diameter = 4;
 nut_diameter = 6;
 nut_height = 3;
 
-// dimensions of HDDs; not model-specific; current values are fake
+// dimensions of HDDs; not model-specific
 hdd_width = 101.6;
 hdd_height = 25.4;
 hdd_length = 146;
-- 
cgit v0.10.1