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Added Raspberry Pi installation instructions to README

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Scott Lawson 2017-01-03 19:33:19 -08:00 committed by GitHub
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@ -92,6 +92,74 @@ For the NodeMCU v3 and Adafruit Feather HUZZAH, the location of the RX1 pin is s
- Set `UDP_IP` to the IP address of your ESP8266 (must match `ip` in [ws2812_controller.ino](arduino/ws2812_controller/ws2812_controller.ino))
- If needed, set `MIC_RATE` to your microphone sampling rate in Hz. Most of the time you will not need to change this.
# Installation for Raspberry Pi
## Basic setup for headless operation
1. Enable SSH by creating 'ssh' file in the boot directory of SD card
2. Determine the pi's IP address by viewing router DHCP client list
3. SSH into the pi using 'ssh pi@[pi-ip-here]' without the '[]'
4. Change the password using the 'passwd' command
## Installing the Python dependencies
Install python dependencies using apt-get
```
sudo apt-get update
sudo apt-get install python-numpy python-scipy python-pyaudio python-skimage
```
## Install ws281x library
To install the ws281x library I recommend following this [Adafruit tutorial](https://learn.adafruit.com/neopixels-on-raspberry-pi/software).
```
sudo apt-get install build-essential python-dev git scons swig
git clone https://github.com/jgarff/rpi_ws281x.git
cd rpi_ws281x
scons
cd python
sudo python setup.py install
```
## Audio device configuration
For the Raspberry Pi, a USB audio device needs to be configured as the default audio device.
Create/edit `/etc/asound.conf`
```
sudo nano /etc/asound.conf
```
Set the file to the following text
```
pcm.!default {
type hw
card 1
}
ctl.!default {
type hw
card 1
}
```
Next, set the USB device to as the default device by editing `/usr/share/alsa/alsa.conf`
```
sudo nano /usr/share/alsa/alsa.conf:
```
Change
```
defaults.ctl.card 0
defaults.pcm.card 0
```
To
```
defaults.ctl.card 1
defaults.pcm.card 1
```
## Test the LED strip
1. cd rpi_ws281x/python/examples
2. sudo nano strandtest.py
3. Configure the options at the top of the file. Enable logic inverting if you are using an inverting logic-level converter. Set the correct GPIO pin and number of pixels for the LED strip. You will likely need a logic-level converter to convert the Raspberry Pi's 3.3V logic to the 5V logic used by the ws2812b LED strip.
4. Run example with 'sudo python strandtest.py'
## Configure the visualization code
In `config.py`, set the device to `'pi'` and configure the GPIO, LED and other hardware settings.
# Running the Visualization
Once everything has been configured, run [visualization.py](python/visualization.py) to start the visualization. The visualization will automatically use your default recording device (microphone) as the audio input.
@ -103,4 +171,4 @@ If you encounter any issues or have questions about this project, feel free to o
The visualization code currently supports up to 256 LEDs. Support for additional LEDs will be added in the near future.
# License
All code in this project is released under the MIT License.
All code in this project is released under the MIT License.