From 68dce97d9d97b93844d83c44d456db7ccf50a9cf Mon Sep 17 00:00:00 2001
From: Gurkengewuerz <niklas@schuetrumpf.net>
Date: Thu, 25 Oct 2018 22:24:51 +0200
Subject: [PATCH] init repo

---
 sketch.ino | 198 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 198 insertions(+)
 create mode 100644 sketch.ino

diff --git a/sketch.ino b/sketch.ino
new file mode 100644
index 0000000..22ca2e0
--- /dev/null
+++ b/sketch.ino
@@ -0,0 +1,198 @@
+/*
+ * @NAME: MIDI-Controller Arduino Nano Software
+ * @AUTHOR: <admin@gurkengewuerz.de> Gurkengewuerz
+ * @REVIEW: 08.06.2017
+ * @VCS: https://git.ita15b.de/schuetrumpf/midi_controller
+ */
+ 
+// http://computermusicresource.com/MIDI.Commands.html
+boolean debug = false;
+ 
+byte midi_cmd_key_on = 144;
+byte midi_cmd_key_off = 128;
+byte midi_cmd_controll = 176;
+ 
+byte potis[] = {
+  16,
+  17,
+  18,
+  19
+};
+// http://www.wavosaur.com/download/midi-note-hex.php
+byte midiNote[] = {
+  0x0C,
+  0x0D,
+  0x0E,
+  0x0F,
+  0x10,
+  0x11,
+  0x12,
+  0x13
+}; // 8 notes
+byte lastPotiStates[] = {
+  0,
+  0,
+  0,
+  0
+};
+ 
+byte channel_count = 5;
+byte channel_leds[] = {
+  8,
+  9,
+  10,
+  11,
+  12
+};
+byte channel_current = 1;
+ 
+// Keypad
+const byte ROWS = 3;
+const byte COLS = 3;
+ 
+int col[] = {
+  3,
+  15,
+  2
+}; // Input
+int row[] = {
+  6,
+  4,
+  5
+}; // Output
+ 
+int last_row = -1;
+int last_cols = -1;
+unsigned long last = millis();
+ 
+void setup() {
+  pinMode(LED_BUILTIN, OUTPUT);
+ 
+  // LEDS
+  for (byte i = 0; i < channel_count; ++i) {
+    pinMode(channel_leds[i], OUTPUT);
+  }
+ 
+  for (int i = 0; i < ROWS; i++) {
+    pinMode(row[i], OUTPUT);
+  }
+ 
+  for (int i = 0; i < COLS; i++) {
+    pinMode(col[i], INPUT_PULLUP);
+  }
+ 
+  // If Debug Mode: enter USB Mode
+  if (debug) {
+    Serial.begin(9600);
+  } else {
+    // MIDI baud rate 31250
+    Serial.begin(31250);
+  }
+}
+ 
+void loop() {
+  for (int i = 0; i < channel_count; ++i) {
+    if (i == (channel_current - 1)) {
+      digitalWrite(channel_leds[i], HIGH);
+    } else {
+      digitalWrite(channel_leds[i], LOW);
+    }
+  }
+ 
+  // Potis abfragen
+  // TODO: Potis Testen
+  for (byte i = 0; i < (sizeof(potis) / sizeof(byte)); ++i) {
+    int val = getDebouncedAnalog(potis[i]);
+    int perc = map(val, 0, 1023, 0, 127);
+    // debugMsg("Poti (" + String(i) + "): " + String(potis[i]));
+    if (!(lastPotiStates[i] > perc - 3 && lastPotiStates[i] < perc + 3)) {
+      debugMsg("Poti => " + String(perc));
+      sendMIDI(midi_cmd_controll + channel_current, midiNote[i], perc);
+      lastPotiStates[i] = perc;
+    }
+  }
+ 
+  for (int i = 0; i < ROWS; i++) {
+    digitalWrite(row[0], HIGH);
+    digitalWrite(row[1], HIGH);
+    digitalWrite(row[2], HIGH);
+    digitalWrite(row[i], LOW);
+    for (int j = 0; j < COLS; j++) {
+      int col_scan = digitalRead(col[j]);
+      if (col_scan == LOW) {
+        keypress(i, j);
+        delay(100);
+      }
+    }
+  }
+}
+ 
+void keypress(int i, int j) {
+  String val = "x";
+ 
+  debugMsg(String(i) + " => " + String(j));
+ 
+  if (last_row == i && last_cols == j && millis() - last < 150) {
+    val = "r";
+    debugMsg("MILLIS: " + String(last) + " / " + String(millis()) + " = " + String(millis() - last) + "ms");
+    last = millis();
+  } else if (i == 0 && j == 0) {
+    val = "1";
+    channel_current = 1;
+  } else if (i == 0 && j == 1) {
+    val = "2";
+    channel_current = 2;
+  } else if (i == 0 && j == 2) {
+    val = "3";
+    channel_current = 3;
+  } else if (i == 1 && j == 0) {
+    val = "4";
+    channel_current = 4;
+  } else if (i == 1 && j == 1) {
+    val = "5";
+    channel_current = 5;
+  } else if (i == 1 && j == 2) {
+    val = "6";
+    sendMIDI(midi_cmd_key_on + channel_current, midiNote[4], 0x45);
+  } else if (i == 2 && j == 0) {
+    val = "7";
+    sendMIDI(midi_cmd_key_on + channel_current, midiNote[5], 0x45);
+  } else if (i == 2 && j == 1) {
+    val = "8";
+    sendMIDI(midi_cmd_key_on + channel_current, midiNote[6], 0x45);
+  } else if (i == 2 && j == 2) {
+    val = "9";
+    sendMIDI(midi_cmd_key_on + channel_current, midiNote[7], 0x45);
+  }
+ 
+  debugMsg(val);
+ 
+  last = millis();
+  last_row = i;
+  last_cols = j;
+}
+ 
+// http://forum.arduino.cc/index.php?topic=190305.msg1408310#msg1408310
+int getDebouncedAnalog(const byte pin) {
+  static int previousReading = 0; // static is better than a global
+  int newReading = analogRead(pin);
+  if ((newReading - 1 > previousReading) || (newReading + 1 < previousReading)) {
+    previousReading = newReading;
+  }
+ 
+  return previousReading;
+}
+ 
+// https://www.arduino.cc/en/Tutorial/Midi
+// cmd - pitch - velocity
+void sendMIDI(byte statusByte, byte dataByte1, byte dataByte2) {
+  Serial.write(statusByte);
+  Serial.write(dataByte1);
+  Serial.write(dataByte2);
+}
+ 
+void debugMsg(String msg) {
+  if (debug) {
+    Serial.println(msg);
+  }
+}
\ No newline at end of file