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Spectrum Analyzer

This project captures audio signals from the BitDogLab microphone and uses the Fast Fourier Transform (FFT) to extract frequency components, displaying the results on the OLED screen.

How It Works

  • The microphone captures ambient sound samples via the ADC.
  • The values are stored in a buffer and processed.
  • The FFT is computed using the kiss_fftr library, generating a frequency spectrum.
  • The results are converted into vertical bars and displayed on the OLED.

Installation and Usage

  1. Clone this repository and open the files in VS Code. To clone the repository, use the command below:

    git clone https://github.com/r4mon-vinicius/spectrum_analyzer.git

  2. Connect the BitDogLab to the computer via USB.

  3. Press the BOOTSEL button and then the RESET button. The board will enter BOOT mode. If the board has serial communication enabled, you can use the following command:

    picotool reboot -f -u

  4. Compile and upload the code to the BitDogLab. The OLED display should show the frequency spectrum captured by the microphone.

Future Improvements

  • Implementation of a numerical frequency scale on the display.
  • Optimization of the display rendering algorithm.
  • Application of digital filters for noise reduction.

Links

This project is based on the following repositories: