From 459a44ca0247324d50b5ca9298c611627d2303c7 Mon Sep 17 00:00:00 2001
From: Antonio Ospite <ao2@ao2.it>
Date: Wed, 30 May 2018 16:24:43 +0200
Subject: [PATCH] Initial import

---
 Fritzing/Hall-Effect-Sensor.fzz                    | Bin 0 -> 29686 bytes
 ...US1881UA_3394d811b1e61364d06f034ffbe599db_6.fzp | 101 +++
 Fritzing/svg/US1881_PCB.svg                        | 189 ++++++
 Fritzing/svg/US1881_breadboard.svg                 | 122 ++++
 Fritzing/svg/US1881_schematic.svg                  | 134 ++++
 Tetramag-ring-magnet.svg                           | 751 +++++++++++++++++++++
 rotary_encoder/Makefile                            |   6 +
 rotary_encoder/rotary_encoder.ino                  |  75 ++
 show_quadrature_states/Makefile                    |   6 +
 show_quadrature_states/show_quadrature_states.ino  |  44 ++
 10 files changed, 1428 insertions(+)
 create mode 100644 Fritzing/Hall-Effect-Sensor.fzz
 create mode 100644 Fritzing/parts/US1881UA_3394d811b1e61364d06f034ffbe599db_6.fzp
 create mode 100644 Fritzing/svg/US1881_PCB.svg
 create mode 100644 Fritzing/svg/US1881_breadboard.svg
 create mode 100644 Fritzing/svg/US1881_schematic.svg
 create mode 100644 Tetramag-ring-magnet.svg
 create mode 100644 rotary_encoder/Makefile
 create mode 100644 rotary_encoder/rotary_encoder.ino
 create mode 100644 show_quadrature_states/Makefile
 create mode 100644 show_quadrature_states/show_quadrature_states.ino

diff --git a/Fritzing/Hall-Effect-Sensor.fzz b/Fritzing/Hall-Effect-Sensor.fzz
new file mode 100644
index 0000000000000000000000000000000000000000..57ba1d3e4ea245d504d65f6167953407985a3f3b
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diff --git a/Fritzing/parts/US1881UA_3394d811b1e61364d06f034ffbe599db_6.fzp b/Fritzing/parts/US1881UA_3394d811b1e61364d06f034ffbe599db_6.fzp
new file mode 100644
index 0000000..b68a8f3
--- /dev/null
+++ b/Fritzing/parts/US1881UA_3394d811b1e61364d06f034ffbe599db_6.fzp
@@ -0,0 +1,101 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<module moduleId="US1881UA_3394d811b1e61364d06f034ffbe599db_6" referenceFile="mystery_part_sip_3_100mil.fzp">
+ <version>4</version>
+ <author>Antonio Ospite</author>
+ <title>US1881 Hall effect sensor</title>
+ <label>U</label>
+ <date>mar mag 29 2018</date>
+ <tags>
+  <tag>sensor</tag>
+ </tags>
+ <properties>
+  <property name="variant">Variant 1</property>
+  <property name="family">Sensor</property>
+  <property name="chip label">US1881</property>
+  <property name="part number"></property>
+  <property name="pin spacing">100mil</property>
+  <property name="hole size"></property>
+  <property name="editable pin labels">false</property>
+  <property name="package">THT</property>
+  <property name="layer"></property>
+  <property name="pins">3</property>
+  <property name="layout">Single Row</property>
+ </properties>
+ <taxonomy>part.mystery.magical.3.pins</taxonomy>
+ <description>&lt;!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN" "http://www.w3.org/TR/REC-html40/strict.dtd">
+&lt;html>&lt;head>&lt;meta name="qrichtext" content="1" />&lt;style type="text/css">
+p, li { white-space: pre-wrap; }
+&lt;/style>&lt;/head>&lt;body style=" font-family:'Cantarell'; font-size:11pt; font-weight:400; font-style:normal;">
+&lt;p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">&lt;br />&lt;/p>&lt;/body>&lt;/html></description>
+ <views>
+  <iconView>
+   <layers image="icon/US1881UA_2d0ad8960d79f0a6ab217e6b43398fc3_2_icon.svg">
+    <layer layerId="icon"/>
+   </layers>
+  </iconView>
+  <breadboardView>
+   <layers image="breadboard/US1881UA_2d0ad8960d79f0a6ab217e6b43398fc3_2_breadboard.svg">
+    <layer layerId="breadboard"/>
+   </layers>
+  </breadboardView>
+  <schematicView>
+   <layers image="schematic/US1881UA_2d0ad8960d79f0a6ab217e6b43398fc3_2_schematic.svg">
+    <layer layerId="schematic"/>
+   </layers>
+  </schematicView>
+  <pcbView>
+   <layers image="pcb/US1881UA_2d0ad8960d79f0a6ab217e6b43398fc3_2_pcb.svg">
+    <layer layerId="silkscreen"/>
+    <layer layerId="copper0"/>
+    <layer layerId="copper1"/>
+   </layers>
+  </pcbView>
+ </views>
+ <connectors>
+  <connector id="connector0" type="male" name="VDD">
+   <description>Supply Voltage pin</description>
+   <views>
+    <breadboardView>
+     <p svgId="connector0pin" terminalId="connector0terminal" layer="breadboard"/>
+    </breadboardView>
+    <schematicView>
+     <p svgId="connector0pin" terminalId="connector0terminal" layer="schematic"/>
+    </schematicView>
+    <pcbView>
+     <p svgId="connector0pin" layer="copper0"/>
+     <p svgId="connector0pin" layer="copper1"/>
+    </pcbView>
+   </views>
+  </connector>
+  <connector id="connector1" type="male" name="GND">
+   <description>Ground pin</description>
+   <views>
+    <breadboardView>
+     <p svgId="connector1pin" terminalId="connector1terminal" layer="breadboard"/>
+    </breadboardView>
+    <schematicView>
+     <p svgId="connector1pin" terminalId="connector1terminal" layer="schematic"/>
+    </schematicView>
+    <pcbView>
+     <p svgId="connector1pin" layer="copper0"/>
+     <p svgId="connector1pin" layer="copper1"/>
+    </pcbView>
+   </views>
+  </connector>
+  <connector id="connector2" type="male" name="OUT">
+   <description>Output pin</description>
+   <views>
+    <breadboardView>
+     <p svgId="connector2pin" terminalId="connector2terminal" layer="breadboard"/>
+    </breadboardView>
+    <schematicView>
+     <p svgId="connector2pin" terminalId="connector2terminal" layer="schematic"/>
+    </schematicView>
+    <pcbView>
+     <p svgId="connector2pin" layer="copper0"/>
+     <p svgId="connector2pin" layer="copper1"/>
+    </pcbView>
+   </views>
+  </connector>
+ </connectors>
+</module>
diff --git a/Fritzing/svg/US1881_PCB.svg b/Fritzing/svg/US1881_PCB.svg
new file mode 100644
index 0000000..c293c75
--- /dev/null
+++ b/Fritzing/svg/US1881_PCB.svg
@@ -0,0 +1,189 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Fritzing (http://www.fritzing.org/) -->
+
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   version="1.2"
+   x="0in"
+   y="0in"
+   width="4.0999999mm"
+   height="1.4548388mm"
+   viewBox="0 0 11.622047 4.1239525"
+   id="svg35"
+   sodipodi:docname="US1881_PCB.svg"
+   inkscape:version="0.92.3 (2405546, 2018-03-11)">
+  <metadata
+     id="metadata41">
+    <rdf:RDF>
+      <cc:Work
+         rdf:about="">
+        <dc:format>image/svg+xml</dc:format>
+        <dc:type
+           rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
+        <dc:title></dc:title>
+      </cc:Work>
+    </rdf:RDF>
+  </metadata>
+  <defs
+     id="defs39" />
+  <sodipodi:namedview
+     pagecolor="#ffffff"
+     bordercolor="#666666"
+     borderopacity="1"
+     objecttolerance="10"
+     gridtolerance="10"
+     guidetolerance="10"
+     inkscape:pageopacity="0"
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diff --git a/rotary_encoder/Makefile b/rotary_encoder/Makefile
new file mode 100644
index 0000000..cc24a34
--- /dev/null
+++ b/rotary_encoder/Makefile
@@ -0,0 +1,6 @@
+BOARD_TAG = uno
+MONITOR_PORT = /dev/ttyACM0
+
+ARDUINO_LIBS = DFRkeypad Encoder LiquidCrystal
+
+include /usr/share/arduino/Arduino.mk
diff --git a/rotary_encoder/rotary_encoder.ino b/rotary_encoder/rotary_encoder.ino
new file mode 100644
index 0000000..8515524
--- /dev/null
+++ b/rotary_encoder/rotary_encoder.ino
@@ -0,0 +1,75 @@
+/*
+ * Rotary encoder example
+ *
+ * Copyright (C) 2018  Antonio Ospite <ao2@ao2.it>
+ * SPDX-License-Identitier: WTFPL
+ */
+
+#include <DFRkeypad.h>
+#include <Encoder.h>
+#include <LiquidCrystal.h>
+
+#define ENCODER_CHANNEL_A 2
+#define ENCODER_CHANNEL_B 3
+
+#define COUNTS_PER_ROTATION 84
+
+#define LCD_RS 8
+#define LCD_EN 9
+#define LCD_D4 4
+#define LCD_D5 5
+#define LCD_D6 6
+#define LCD_D7 7
+#define LCD_BL 10
+
+#define BACKLIGHT_VALUE 1023
+
+long old_counts = 0;
+Encoder encoder(ENCODER_CHANNEL_A, ENCODER_CHANNEL_B);
+LiquidCrystal lcd(LCD_RS, LCD_EN, LCD_D4, LCD_D5, LCD_D6, LCD_D7);
+
+void setup() {
+	pinMode(LCD_BL, OUTPUT);
+	analogWrite(LCD_BL, BACKLIGHT_VALUE);
+
+	lcd.begin(16, 2);
+
+	lcd.setCursor(1, 0);
+	lcd.print("Rotary Encoder");
+	lcd.setCursor(1, 1);
+	lcd.print("https://ao2.it");
+
+	DFRkeypad::FastADC(true);
+	DFRkeypad::iDEFAULT_THRESHOLD=140;
+}
+
+void loop() {
+	byte key = DFRkeypad::GetKey();
+	if (key == DFRkeypad::eSELECT) {
+		encoder.write(0);
+	}
+
+	long new_counts = encoder.read();
+	if (new_counts != old_counts) {
+		old_counts = new_counts;
+
+		lcd.clear();
+
+		lcd.setCursor(0, 0);
+		lcd.print("Count: ");
+		lcd.setCursor(8, 0);
+		lcd.print(new_counts);
+
+		/* Position normalized between 0 and COUNTS_PER_ROTATION */
+		long position = ((new_counts % COUNTS_PER_ROTATION) + COUNTS_PER_ROTATION) % COUNTS_PER_ROTATION;
+
+		float angle = position * (360.0 / COUNTS_PER_ROTATION);
+
+		lcd.setCursor(0, 1);
+		lcd.print("Angle: ");
+		lcd.setCursor(8, 1);
+		lcd.print(angle);
+	}
+
+	delay(20);
+}
diff --git a/show_quadrature_states/Makefile b/show_quadrature_states/Makefile
new file mode 100644
index 0000000..7b0316f
--- /dev/null
+++ b/show_quadrature_states/Makefile
@@ -0,0 +1,6 @@
+BOARD_TAG = uno
+MONITOR_PORT = /dev/ttyACM0
+
+ARDUINO_LIBS = Encoder
+
+include /usr/share/arduino/Arduino.mk
diff --git a/show_quadrature_states/show_quadrature_states.ino b/show_quadrature_states/show_quadrature_states.ino
new file mode 100644
index 0000000..b44f0ad
--- /dev/null
+++ b/show_quadrature_states/show_quadrature_states.ino
@@ -0,0 +1,44 @@
+/*
+ * Show quadrature states of two Hall effect sensors.
+ *
+ * Copyright (C) 2018  Antonio Ospite <ao2@ao2.it>
+ * SPDX-License-Identitier: WTFPL
+ */
+
+#define HALL_CHANNEL_A 2
+#define HALL_CHANNEL_B 3
+#define LED_PIN 13
+
+int hall_state_A = 0;
+int hall_state_B = 0;
+
+int old_hall_state_A = -1;
+int old_hall_state_B = -1;
+
+void setup()
+{
+	pinMode(HALL_CHANNEL_A, INPUT);
+	pinMode(HALL_CHANNEL_B, INPUT);
+	pinMode(LED_PIN, OUTPUT);
+	Serial.begin(115200);
+}
+
+void loop()
+{
+	hall_state_A = digitalRead(HALL_CHANNEL_A);
+	hall_state_B = digitalRead(HALL_CHANNEL_B);
+
+	if (hall_state_A != old_hall_state_A ||
+	    hall_state_B != old_hall_state_B)
+	{
+		digitalWrite(LED_PIN, hall_state_A);
+
+		old_hall_state_A = hall_state_A;
+		old_hall_state_B = hall_state_B;
+
+		Serial.print(hall_state_A);
+		Serial.print(" ");
+		Serial.print(hall_state_B);
+		Serial.print("\r\n");
+	}
+}
-- 
2.1.4