From 116748d9c72e9c2397c05544335d5f0eab32d4ff Mon Sep 17 00:00:00 2001
From: dakkar <dakkar@thenautilus.net>
Date: Thu, 20 Aug 2020 14:07:21 +0100
Subject: printed holder for the sensors

---
 3d-print/.gitignore      |  1 +
 3d-print/qrd-holder.scad | 60 ++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 61 insertions(+)
 create mode 100644 3d-print/.gitignore
 create mode 100644 3d-print/qrd-holder.scad

diff --git a/3d-print/.gitignore b/3d-print/.gitignore
new file mode 100644
index 0000000..b662cb0
--- /dev/null
+++ b/3d-print/.gitignore
@@ -0,0 +1 @@
+/*.stl
\ No newline at end of file
diff --git a/3d-print/qrd-holder.scad b/3d-print/qrd-holder.scad
new file mode 100644
index 0000000..fcda4ee
--- /dev/null
+++ b/3d-print/qrd-holder.scad
@@ -0,0 +1,60 @@
+use </home/dakkar/3d-models/Lego/LEGO.scad/LEGO.scad>;
+
+
+module qrd1114() {
+     /*
+       4 holes, 0.4mm diameter, rectangle
+
+       o-o  3.3
+       | |
+       o-o
+
+       3
+
+       the holes' diameter is larger because:
+
+       - my printer can't reliably print holes smaller than 1 (which
+         ends up being about .4 anyway)
+
+       - there's a "end bump" on the stems of the sensor, and I need
+         those to go through the hole as well
+     */
+
+     width=3;
+     height=3.3;
+     diam=1.2;
+     radius=diam/2;
+
+     module via() {
+          translate([0,0,-5]) cylinder(h=10,r=radius,center=false,$fn=12);
+     }
+
+     place(0.5,0.5) {
+          for (x=[-0.5,0.5],y=[-0.5,0.5]) {
+               translate([x*width,y*height]) via();
+          }
+     }
+}
+
+length=6;
+width=2;
+
+sensors=[0, 1.5, 2.5, 3.5, 5];
+
+difference() {
+     uncenter(width,length) block(
+          type="baseplate",
+          width=width,
+          length=length,
+          roadway_width=1,
+          roadway_length=60,
+          roadway_x=0,
+          // my printer makes the studs slightly small
+          stud_rescale=0.49/0.48
+     );
+     for (x=sensors) {
+          place(0,x) qrd1114();
+     }
+}
+     
+
-- 
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