feat ✨: Added new header files AudioLevelTracker.h, Config.h, I2SConfig.h, and updated Arduino code for improved I2S communication and dynamic range limiting.

- Added a new header file `AudioLevelTracker.h` to track audio levels with a history of up to 3 seconds and a maximum range limit.
- `Config.h` has been added with new serial and I2S configurations. The aim is to configure these peripherals for audio processing.
- Added new header file `I2SConfig.h` with setup functions for initializing and reading from I2S interface.
- The `AudioLevelTracker.cpp` file has been updated to include functionality for tracking the maximum audio level over a specified duration.
- Initial setup for I2S communication with a microphone.
- Updated `Arduino` code with improved I2S configuration and dynamic range limiting.

include/AudioLevelTracker.h

@@ -0,0 +1,23 @@
+#pragma once
+
+#include <Arduino.h>
+#include <deque>
+
+class AudioLevelTracker {
+public:
+    AudioLevelTracker();
+    void updateMaxLevel(int32_t sample);
+    int32_t getMaxLevel() const;
+    void resetMaxLevel();
+
+private:
+    struct SamplePoint {
+        uint32_t timestamp;
+        int32_t value;
+    };
+    std::deque<SamplePoint> sampleHistory;
+    int32_t maxLevel;
+
+    static const uint32_t HISTORY_DURATION_MS = 3000;  // 3 seconds history
+    static const int32_t MAX_RANGE_LIMIT = 200000000;  // Maximum allowed range limit
+};

include/Config.h

@@ -0,0 +1,41 @@
+#pragma once
+#include <cstdint>
+
+namespace Config {
+
+    // Serial Configuration
+    constexpr int SERIAL_BAUD_RATE = 115200;     // Serial communication baud rate
+
+    // I2S Pin Configuration
+    constexpr int I2S_MIC_SERIAL_CLOCK = 8;      // SCK
+    constexpr int I2S_MIC_LEFT_RIGHT_CLOCK = 9;  // WS/LRC 
+    constexpr int I2S_MIC_SERIAL_DATA = 10;      // SD
+
+    // I2S Configuration
+    constexpr int SAMPLE_RATE = 8000;            // Hz
+    constexpr int BITS_PER_SAMPLE = 32;          // Bits
+    constexpr int CHANNELS = 1;                  // Mono input
+    constexpr int SAMPLE_BUFFER_SIZE = 512;      // Samples per buffer
+
+    // DMA Configuration
+    constexpr int DMA_BUFFER_COUNT = 8;          // Number of DMA buffers
+    constexpr int DMA_BUFFER_LEN = 1024;         // Length of each DMA buffer
+
+    // Audio Processing
+    constexpr float DC_OFFSET = 0.0f;            // DC offset correction
+    constexpr float GAIN = 1.0f;                 // Audio gain multiplier
+    constexpr int32_t NOISE_THRESHOLD = 1000;    // Ignore audio below this level
+    constexpr int32_t DEFAULT_RANGE_LIMIT = 200000000; // Default range limit for plotting
+    constexpr float DECAY_FACTOR = 0.95f;        // Level decay rate
+
+    // Timing and Debug
+    constexpr uint32_t LEVEL_UPDATE_INTERVAL_MS = 100;  // Level update interval
+    constexpr bool ENABLE_DEBUG = true;                 // Enable debug output
+    constexpr int DEBUG_INTERVAL_MS = 1000;            // Debug print interval
+
+    // System Configuration
+    constexpr uint32_t TASK_STACK_SIZE = 4096;   // Audio task stack size
+    constexpr uint8_t TASK_PRIORITY = 1;         // Audio task priority (0-24)
+    constexpr uint8_t TASK_CORE = 0;            // Core to run audio task (0 or 1)
+    
+}

include/I2SConfig.h

@@ -0,0 +1,9 @@
+#pragma once
+
+#include <Arduino.h>
+#include <driver/i2s.h>
+#include "Config.h"
+
+// I2S setup functions
+void initI2S();
+void readI2SSamples(int32_t* samples, size_t* bytesRead);