Music LED

Experimental LED music visualizer

This repo uses the flux_led library and allows you to visualize music. You will need numpy and pyaudio for this to work.

Inspired by:

• this blog
• this project
• and this project

Setup

You can run this on Mac or Linux. In order for this to work, you'll need:

• Microphone or line in (built in to many devices)
• Python installed on your device
• The IP addresses of your magic home LED controllers

The installation varies based on the device, but you run the code in the same way after installation is finished.

LED configuration

You will need a list of IPs to place into ip.order.txt. An example configuration has been provided. The list should contain 1 IP per line. The file should end with a blank line.

You can generate a list of IPs using:

./flux_led_v4.py --scan | awk '{print $2}'

Mac setup

You will need to install the portaudio plugin through brew:

brew install portaudio
pip install -r requirements.txt

Linux (Raspberry Pi) setup

There are several steps involved in getting this code to run on linux. You will need to install several additional packages and set up some environment variables, then edit some configurations.

Install packages You will need some

sudo apt-get update
sudo apt-get install libportaudio0 libportaudio2 libportaudiocpp0 portaudio19-dev libatlas-base-dev libffi-dev redis

Set up environment variables

echo "PA_ALSA_PLUGHW=1" >> ~/.bashrc

Edit some configurations Inside of ~/.asoundrc

pcm.!default { type hw card 1 }
ctl.!default { type hw card 1 }

Inside of /usr/share/alsa/alsa.conf (you will need to edit this with sudo), you will need to comment out lines 127 through 142

Install dependencies with Python

# install virtual environment
# optional but highly recommended
sudo pip3 install virtualenv
virtualenv venv
source venv/bin/activate

# install dependencies
pip install -r requirements.txt

Configure audio device Inside of your virtual enviromnent, you will need to run python -m sounddevice to figure out what device you're using to capture audio, and how many channels it has:

(venv) pi@music-led:~/Music-LED $ python -m sounddevice
  0 RODE AI-1: USB Audio (hw:1,0), ALSA (1 in, 2 out)
* 1 default, ALSA (1 in, 2 out)

You will then need to take the above information, and plug it into music.py, on lines 18 and 19.

• The device should equal to the number which is to the left of your input device (in this case it's 0, as part of 0 RODE AI-1: US...)
• The channel should equal to the number of inputs, which is at the end of the line (in this case it's 1, as part of (1 in, 2 out))

Once you have everything set up, you can run it.

Run on boot

Inside of /lib/systemd/system/musicled.service, you will need to add the following:

[Unit]
Description=Music LED experience
After=multi-user.target

[Service]
Environment="REDIS_URL=redis://localhost:6379"
ExecStartPre=/bin/bash -c 'source /home/pi/Music-LED/venv/bin/activate && /home/pi/Music-LED/venv/bin/python /home/pi/Music-LED/server.py > /home/pi/serverled.log 2>&1 &'
ExecStart=/bin/bash -c 'source /home/pi/Music-LED/venv/bin/activate && /home/pi/Music-LED/venv/bin/python /home/pi/Music-LED/music.py > /home/pi/musicled.log 2>&1'

[Install]
WantedBy=multi-user.target

You will then need to enable the service with sudo systemctl enable musicled.service. This should run when you reboot the Pi every time.

Running

You will need to have redis-server installed and running on your computer. Put the mode in the redis server,

$ redis-cli
127.0.0.1:6379> set mode "(dp0\nS'mode'\np1\nS'music'\np2\ns."

export REDIS_URL='redis://localhost:6379'
python music.py

This code will look at IPs you have saved in ip.order.txt and will change their color based on what is heard through the microphone.

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Coded with ❤️ in Lausanne