Arduino Nicla Vision – ein kleines Board mit großen Möglichkeiten

				
					#include 

  // default number of output channels
  static const char channels = 1;

  // default PCM output frequency
  static const int frequency = 16000;

  // Buffer to read samples into, each sample is 16-bits
  short sampleBuffer[512];

  // Number of audio samples read
  volatile int samplesRead;

  // Blinking 
  bool state = false;
  int timeStart = 0;

  void setup() {
    Serial.begin(9600);
    pinMode(LEDB, OUTPUT);

    while (!Serial);

    // Configure the data receive callback
    PDM.onReceive(onPDMdata);

    // Optionally set the gain
    // Defaults to 20 on the BLE Sense and 24 on the Portenta Vision Shield
    // PDM.setGain(30);

    // Initialize PDM with:
    // - one channel (mono mode)
    // - a 16 kHz sample rate for the Arduino Nano 33 BLE Sense
    // - a 32 kHz or 64 kHz sample rate for the Arduino Portenta Vision Shield
    if (!PDM.begin(channels, frequency)) {
      Serial.println("Failed to start PDM!");
      while (1);
    }


  }

  void loop() {
    // Wait for samples to be read
    if (samplesRead) {

      // Print samples to the serial monitor or plotter
      for (int i = 0; i  sampleBuffer[2]) {
        digitalWrite(LEDB, state);
        state = !state;
      }
    }
  }

  /**
    Callback function to process the data from the PDM microphone.
    NOTE: This callback is executed as part of an ISR.
    Therefore using `Serial` to print messages inside this function isn't supported.
  * */
  void onPDMdata() {
    // Query the number of available bytes
    int bytesAvailable = PDM.available();

    // Read into the sample buffer
    PDM.read(sampleBuffer, bytesAvailable);

    // 16-bit, 2 bytes per sample
    samplesRead = bytesAvailable / 2;
  }