├── 3D Design ├── FFT4.1 on Board.f3d ├── Spectrum op plank v7.png └── nop.txt ├── Calibration of the FFT Spectrum Analyzer.pdf ├── Hardware ├── Gerber_PCB2.0 Production data.zip ├── PCB_PCB2.0 assembly_2021-06-24.pdf ├── nop.txt └── schematic4.1.pdf ├── LICENSE ├── Main Sketch └── V1.0 │ ├── FFT.h │ ├── I2SPLUGIN.h │ ├── LEDDRIVER.h │ ├── PatternsHUB75.h │ ├── PatternsLedstrip.h │ ├── Readme.md │ ├── Settings.h │ ├── V1.0.ino │ ├── fire.h │ ├── libaries │ ├── Adafruit_BusIO │ │ └── subdir.mk │ ├── Adafruit_GFX_Library │ │ └── subdir.mk │ ├── ESP32_HUB75_LED_MATRIX_PANEL_DMA_Display │ │ └── subdir.mk │ ├── FastLED │ │ └── src │ │ │ ├── platforms │ │ │ └── esp │ │ │ │ └── 32 │ │ │ │ └── subdir.mk │ │ │ └── subdir.mk │ ├── FastLED_NeoMatrix │ │ └── subdir.mk │ ├── Framebuffer_GFX │ │ └── subdir.mk │ ├── FreeRTOS │ │ └── src │ │ │ └── subdir.mk │ ├── SPI │ │ └── src │ │ │ └── subdir.mk │ ├── Wire │ │ └── src │ │ │ └── subdir.mk │ ├── arduinoFFT │ │ └── src │ │ │ └── subdir.mk │ └── 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