added Monitor stand cad files

monitor_stand/README.md

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+# Monitor Stand
+
+This folder contains STL and also OpenSCAD code for the PiSight monitor stand. 
+Feel free to adjust the depth and size according to your own monitor!
+
+![monitor_hooked_up](monitor_hooked_up.jpg)
+
+![side_shot](side_shot.jpg)
+
+![side_shot_1](side_shot_2.jpg)
+
+Enjoy!
+Ling

monitor_stand/pisight_monitor_stand.scad

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+use <MCAD/regular_shapes.scad>
+
+echo(version = version());
+
+fn = 300; // sets the smoothness of the cylinder
+
+// monitor_hook dimensions
+monitor_hook_width = 45;
+monitor_hook_front = 13;
+section_height = 30;
+section_z_trans = - 10;
+
+// meaurements for the isight oval base:
+isight_length = 37;
+isight_width = 23;
+isight_pizero_slot = 5;
+
+module monitor_hook() {
+    difference()
+        {
+            cube([monitor_hook_width, 25, monitor_hook_front], center = true);
+            translate([0, 0, - 3]) cube([monitor_hook_width + 1, 20, monitor_hook_front], center = true);
+        }
+    translate([0, 11, section_z_trans]) cube([45, 3, section_height], center = true);
+}
+
+
+module my_tube() {
+    color("green")
+        translate([0, 20, - 10])
+            rotate(a = [0, 90, 90])
+                cube([30, 10, 15], center = true);
+}
+
+
+module rear_tube() {
+    hull() {
+        my_tube();
+        translate([0, isight_length + 5, 0]) isight_base();
+    }
+    translate([0, isight_length + 5, 10]) isight_base();
+}
+
+module isight_base(extrude = 15) {
+    difference() {
+        linear_extrude(extrude)
+            hull() {
+                translate([0, isight_width / 2, 0]) circle(r = isight_width / 2);
+                translate([0, isight_length - isight_width / 2, 0]) circle(r = isight_width / 2);
+            };
+        translate([- isight_pizero_slot / 2, 0, - 1]) cube([isight_pizero_slot, isight_length, extrude + 2]);
+    }
+}
+
+// now build everything
+color("blue")
+    difference()
+        {
+            rear_tube();
+            translate([- isight_pizero_slot / 2, 42, - 50]) cube([isight_pizero_slot, isight_length, 80]);
+        };
+
+
+monitor_hook();