Implementiere USB-MIDI-Controller für Arduino Pro Micro mit Hardware- und Software-Architektur, einschließlich Button- und LED-Steuerung, Multiplexer-Integration und MIDI-Kommunikation.

include/button_handler.h

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+#ifndef BUTTON_HANDLER_H
+#define BUTTON_HANDLER_H
+
+#include <Arduino.h>
+#include <Adafruit_MCP23X17.h>
+
+class ButtonHandler {
+private:
+  Adafruit_MCP23X17* mcp1;
+  Adafruit_MCP23X17* mcp2;
+  
+  bool buttonStates[20];
+  bool lastButtonStates[20];
+  unsigned long lastDebounceTime[20];
+  
+public:
+  ButtonHandler(Adafruit_MCP23X17* mcp1, Adafruit_MCP23X17* mcp2);
+  void init();
+  void update();
+  bool isPressed(uint8_t buttonIndex);
+  bool wasPressed(uint8_t buttonIndex);
+  bool wasReleased(uint8_t buttonIndex);
+};
+
+#endif

include/config.h

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+#ifndef CONFIG_H
+#define CONFIG_H
+
+// Hardware-Konfiguration
+#define NUM_POTIS 8
+#define NUM_SLIDERS 4
+#define NUM_BUTTONS 20
+#define NUM_LEDS 20
+#define NUM_ANALOG_CONTROLS (NUM_POTIS + NUM_SLIDERS)
+
+// MCP23017 I2C Adressen
+#define MCP1_ADDRESS 0x20  // Erste MCP23017 (Buttons 0-15 & LEDs 0-15)
+#define MCP2_ADDRESS 0x21  // Zweite MCP23017 (Buttons 16-19 & LEDs 16-19)
+
+// CD74HC4067 Multiplexer Pins
+#define MUX_S0 2
+#define MUX_S1 3
+#define MUX_S2 4
+#define MUX_S3 5
+#define MUX_ANALOG_PIN A0
+
+// MIDI-Konfiguration
+#define MIDI_CHANNEL 1
+
+// CC-Mapping für analoge Regler (12 Regler total)
+const uint8_t ANALOG_CC_MAP[NUM_ANALOG_CONTROLS] = {
+  1, 2, 3, 4, 5, 6, 7, 8,     // Potis (CC1-CC8)
+  9, 10, 11, 12               // Schieberegler (CC9-CC12)
+};
+
+// Note-Mapping für Buttons (20 Buttons)
+const uint8_t BUTTON_NOTE_MAP[NUM_BUTTONS] = {
+  36, 37, 38, 39, 40, 41, 42, 43, 44, 45,  // Buttons 0-9 (C2-A2)
+  46, 47, 48, 49, 50, 51, 52, 53, 54, 55   // Buttons 10-19 (A#2-G3)
+};
+
+// Debounce-Konfiguration
+#define DEBOUNCE_TIME 50  // ms
+#define ANALOG_THRESHOLD 4  // Mindeständerung für MIDI-CC
+
+#endif

include/led_controller.h

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+#ifndef LED_CONTROLLER_H
+#define LED_CONTROLLER_H
+
+#include <Arduino.h>
+#include <Adafruit_MCP23X17.h>
+
+class LEDController {
+private:
+  Adafruit_MCP23X17* mcp1;
+  Adafruit_MCP23X17* mcp2;
+  bool ledStates[20];
+  
+public:
+  LEDController(Adafruit_MCP23X17* mcp1, Adafruit_MCP23X17* mcp2);
+  void init();
+  void setLED(uint8_t ledIndex, bool state);
+  void toggleLED(uint8_t ledIndex);
+  bool getLEDState(uint8_t ledIndex);
+  void updateHardware();
+};
+
+#endif

include/midi_handler.h

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+#ifndef MIDI_HANDLER_H
+#define MIDI_HANDLER_H
+
+#include <Arduino.h>
+#include <MIDIUSB.h>
+
+class MIDIHandler {
+private:
+  static void noteOn(byte channel, byte pitch, byte velocity);
+  static void noteOff(byte channel, byte pitch, byte velocity);
+  static void controlChange(byte channel, byte control, byte value);
+  
+public:
+  static void init();
+  static void sendNoteOn(uint8_t note, uint8_t velocity);
+  static void sendNoteOff(uint8_t note, uint8_t velocity);
+  static void sendControlChange(uint8_t controller, uint8_t value);
+  static void processIncomingMIDI();
+  static void (*onNoteOnCallback)(uint8_t note, uint8_t velocity);
+  static void (*onNoteOffCallback)(uint8_t note, uint8_t velocity);
+};
+
+#endif

include/multiplexer.h

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+#ifndef MULTIPLEXER_H
+#define MULTIPLEXER_H
+
+#include <Arduino.h>
+
+class Multiplexer {
+private:
+  uint8_t s0, s1, s2, s3;
+  uint8_t analogPin;
+  int lastValues[16];
+  unsigned long lastReadTime[16];
+  
+public:
+  Multiplexer(uint8_t s0Pin, uint8_t s1Pin, uint8_t s2Pin, uint8_t s3Pin, uint8_t analogPin);
+  void init();
+  int readChannel(uint8_t channel);
+  bool hasChanged(uint8_t channel, int threshold = 4);
+  void selectChannel(uint8_t channel);
+};
+
+#endif