Audio Visualizer

About

Simple audio visualizer based on Raspberry PI, which can be connected to PC via bluetooth and stream music from YouTube.

Video presentation of working device:

Build Setup

• Hardware:

  • Raspberry Pi 3 (or other Raspberry PI with bluetooth module)
  • Led Matrix 32x8 + MAX7219
  • Oled display + SH1106

• Software:

  • Raspberry Pi OS
  • Python 3 and third-party packages:
    • numpy
    • scipy
    • luma.oled
    • luma.led_matrix
    • pybluez
    • pyaudio
    • python-vlc
    • youtube-search-python
    • pafy
  • ALSA

Wiring

1. MAX7219 (LED matrix)

LED pin	OPi pin (phys)	OPi pin name
VCC	pin 4	+5V
GND	pin 14	GND
DIN	pin 19	SPI0_MOSI
CS	pin 24	SPI0_CS0
CLK	pin 23	SPI0_CLK

2. SH1106 (OLED display)

DAC pin	OPi pin (phys)	OPi pin name
GND	pin 6	GND
VCC	pin 1	+3V
SCL	pin 5	SCL
SDA	pin 3	SDA

Configuration

1. I recommend you to read this to avoid problems with audio configuration on your Raspberry: https://github.com/maximtrp/spectrumLED#configuration
2. Enable SPI and PCM devices in Raspberry Pi OS.
3. Install required python packages.
4. Remember to change bluetooth addres to your own in Bluetooth_Client/config.py.

How to run

• Client (PC):

  • install all required packages
  • insert bluetooth address of your raspberry device in Bluetooth_Client/config.py
  • run Bluetooth_Client/main.py
  • if worked correctly, you should see something like this:

  

• Server (Raspberry):

  • install all required packages
  • run Bluetooth_Server/main.py

Credits

Audio processing function (Bluetooth_Server/led_matrix.py) is not mine and was entirely written by: https://github.com/maximtrp/spectrumLED