this is hardware I did to do this
http://learn.adafruit.com/light-painting-with-raspberry-pi/hardware
and you can see the video of the final work
https://www.youtube.com/watch?v=ED2u5O7GyEY
First download The OLA images where can be found at http://nomis52.net/data/raspi/.
Flashing the SD Card using Windows
Using the Win32DiskImager program
- Download the distribution from http://nomis52.net/data/raspi/. or from a mirror or torrent. Make sure the distribution is for the Raspberry Pi, as others will not work. Usually these are zipped (compressed) files ending in .zip or .gz (something like "distribution-name.zip").
- Extract the image file from the downloaded .zip file, so you now have "distribution-name.img".
- Insert the SD card into your SD card reader and check what drive letter it was assigned. You can easily see the drive letter (for example G:) by looking in the left column of Windows Explorer. You can use the SD Card slot (if you have one) or a cheap Adapter in a USB slot.
- Download the Win32DiskImager utility (it is also a zip file). You can run this from a USB drive.
- Extract the executable from the zip file and run the Win32DiskImager utility; you may need to run the utility as Administrator! Right-click on the file, and select 'Run as Administrator'
- Select the image file you extracted above.
- Select the drive letter of the SD card in the device box. Be careful to select the correct drive; if you get the wrong one you can destroy your data on the computer's hard disk! If you are using an SD Card slot in your computer (if you have one) and can't see the drive in the Win32DiskImager window, try using a cheap Adapter in a USB slot.
- Click Write and wait for the write to complete.
- Exit the imager and eject the SD card.
- You are now ready to plug the card into your Raspberry Pi.
Username : pi
password : openlighting
Enable Turbo Mode (Optional) and Expand the Root Partition (Optional)
sudo raspi-config
and select the overclock option, put 1000.
Run this:
sudo apt-get update sudo apt-get upgrade
then run this
for pin in 17 21; do
echo $pin > /sys/class/gpio/export;
chmod a+w /sys/class/gpio/gpio${pin}/value;
chmod a+w /sys/class/gpio/gpio${pin}/direction;
done
Connecting to OLA
http://xxx.xxx.xxx.xxx:9090.then restart raspberry pi
reboot now
Configuration.
A matrix of 41*15 = 615 Led.
As we know artnet protocol use no more than 171 Led per Universe. How many universe we have in 615 Led. Each universe has to be multiple of 41 that is the quantity of LED I have horizontal.
171 / 41=4.17. So I will be using 4 horizontal lines per universe. 41*4= 164 Led per Universe.
How many universe we have to use
615 / 164 = 3.75. this meas that we have to use 3 universe of 164 LED and the fourth universe will be of 123 LED.
1 universe: 164 LED
2 universe: 164 LED
3 universe: 164 LED
4 universe: 123 LED
Total : 615 LED
Now we have to configure ola-spi.conf
nano /var/lib/ola/conf/ola-spi.conf
for a matrix 41*15 = 615 LED this will be the configuration
base_uid = 7a70:00000100
device_prefix = spidev
enabled = true
spidev0.0-0-dmx-address = 1
spidev0.0-0-personality = 1
spidev0.0-0-pixel-count = 164
spidev0.0-1-dmx-address = 1
spidev0.0-1-personality = 1
spidev0.0-1-pixel-count = 164
spidev0.0-2-dmx-address = 1
spidev0.0-2-personality = 1
spidev0.0-2-pixel-count = 164
spidev0.0-3-dmx-address = 1
spidev0.0-3-personality = 1
spidev0.0-3-pixel-count = 123
spidev0.0-backend = software
spidev0.0-ports = 4
spidev0.0-spi-ce-high = false
spidev0.0-spi-speed = 1200000
spidev0.0-sync-port = 0
spidev0.1-0-dmx-address = 1
spidev0.1-0-personality = 1
spidev0.1-backend = software
spidev0.1-ports = 1
spidev0.1-spi-ce-high = false
spidev0.1-spi-speed = 100000
spidev0.1-sync-port = 0
then Cnt X, save
reboot now
Now go to http://xxx.xxx.xxx.xxx:9090
Click add Universe.
Put here id: 1 and name : 1
then you need to add 2 ports for each universe. One input port where raspberry pi will be receiving the data from pixel generator (glediator). in this case artnet port. and one output port where raspberry pi will be sending the data to the Hardware LED MATRIX, in this case will be using SPI port spidev0.0
So you will see something like this depending of how many LED do you have
So you need to do this for each universe you have.
Now download the latest version of glediator.
Go to matrix size. Add the values for your matrix
then go to output.
and below is my configuration.
and then click patch artnet
