From 33a2af7c697cc21a37e73907d725f3caec217057 Mon Sep 17 00:00:00 2001
From: dakkar <dakkar@thenautilus.net>
Date: Thu, 20 Aug 2020 16:19:29 +0100
Subject: the other board

---
 3d-print/controller.scad | 50 ++++++++++++++++++++++++++++++++++++++++++++++++
 wiring.rst.txt           | 41 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 91 insertions(+)
 create mode 100644 3d-print/controller.scad
 create mode 100644 wiring.rst.txt

diff --git a/3d-print/controller.scad b/3d-print/controller.scad
new file mode 100644
index 0000000..cf8a850
--- /dev/null
+++ b/3d-print/controller.scad
@@ -0,0 +1,50 @@
+module via() {
+     cylinder(h=10,r=1,center=true,$fn=12);
+}
+
+// TTGO T7
+module esp32() {
+     for(x=[0, 1, 10, 11]) {
+          for(y=[0 : 9]) {
+               translate([2.54*x,2.54*y,0]) via();
+          }
+     }
+}
+
+// https://learn.adafruit.com/stereo-3-7w-class-d-audio-amplifier/assembly
+module amp() {
+     for(x=[0 : 8]) {
+          translate([0,2.54*x,0]) via();
+     }
+}
+
+module wire_pack() {
+     for(x=[0 : 4]) {
+          translate([0,4*x,0]) via();
+     }
+}
+
+difference() {
+     cube([40,80,1.25]);
+
+     translate([6.25,5,0]) esp32();
+
+     // rows
+
+     // row output pins wired here
+     translate([5,35,0]) wire_pack();
+     // 220Ω between these
+     translate([15,35,0]) wire_pack();
+     // these go to pins 3 of each qrd1114
+
+     // same output pins wired here
+     translate([25,35,0]) wire_pack();
+     // 10k0Ω between these
+     translate([35,35,0]) wire_pack();
+     // these go to pins 1 of each qrd1114
+
+     // columns: ouput pins directly to pins 2&4 of each qrd1114
+
+
+     translate([30,60,0]) rotate([0,0,90]) amp();
+}
diff --git a/wiring.rst.txt b/wiring.rst.txt
new file mode 100644
index 0000000..9280536
--- /dev/null
+++ b/wiring.rst.txt
@@ -0,0 +1,41 @@
+25 sensors
+
+5 rows × 5 columns
+
+pins (`see SparkFun`_)::
+
+  14
+  23
+
+1. phototransistor collector, to pull-up for row
+2. phototransistor emitter, to ground for column
+3. led anode, to limiter for row
+4. led cathode, to ground for column
+
+so…
+
+::
+
+   aM aM aM aM aM cN cN cN cN cN
+   14 14 14 14 14 14 14 14 14 14 …
+   23 23 23 23 23 23 23 23 23 23 …
+   Mb Mb Mb Mb Mb Nd Nd Nd Nd Nd
+
+
+      /---------- input1
+   a -+-10kΩ--+- output1
+   b ---220Ω--/
+
+      /---------- input2
+   c -+-10kΩ--+- output2
+   d ---220Ω--/
+
+   …
+   …
+
+   M ------------ output6
+   N ------------ output7
+
+
+.. `see SparkFun`:
+   https://learn.sparkfun.com/tutorials/qrd1114-optical-detector-hookup-guide/all
-- 
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