Light Painting

[davidh]

Hi,

I was on RaspberryPi.org and saw the Light Paintings. Really liked it. Did you use LED cables?

Cheers
David

[adafruit]

Hi,

I was on RaspberryPi.org and saw the Light Paintings. Really liked it. Did you use LED cables?

Cheers
David

http://learn.adafruit.com/light-paintin ... spberry-pi

[pburgess]

Thanks David!

The project used this LED strip, just short of 3 meters worth.

[tbitson]

Are the example image files available?

[pburgess]

Sure! Here's the ones I think worked out best...

fireloop.png (27.34 KiB) Viewed 1354 times

tronbike.png (51.6 KiB) Viewed 1354 times

cokecan.png (32.32 KiB) Viewed 1354 times

[tbitson]

Awesome. Thanks Dr. dragon. The flames are best!

[Bentpins]

Hello Phil,

I put one of these together yesterday with a 32 pixel strip from Adafruit strapped to a PVC pipe. I got something, but the image was not displaying correctly. Then I looked at the test images you posted (thanks for those, they helped connect the dots ). Based on the resolution, your strip must have been 92 pixels long right?

You must have been traveling at a good clip too? To get results from my setup, it had to really be moving!

I love the POV thing but got intrigued with the idea of a matrix. I read some of the other posts about this and I started putting together a matrix that will be 10x16 from the 5 meter LPD8806 strip I also bought and wondered what it would take in the code to make it display on the matrix?

I ran the strips in a zig-zag pattern and bought the 10 amp unit as well to handle the power required.

I'm new to Python and electronics, so just looking for a push in the right direction.

Thanks,
Bent

[pburgess]

Yep, 92 pixel strand, arranged in a circle rather than a line. Not sure of my speed, but I'd guesstimate it was at least 5mph...did this on the back of my bike so the images would be smooth and not have the sort of "jumpiness" I've seen on hand-carried light paintings.

[scooter1015]

Hey! So I read this piece and knew I had to give this a shot. I'm getting the software up and running but have a problem when I try and run the code that you gave. The following error is what I keep getting:

File "lightpaint.py", Line 7 in <module>
import RPi.GPIO as GPIO, Image, Time
ImportError: No module named Image

I've installed the GPIO libraries but when I try and run 'sudo apt-get install python-imaging-tk' it cannot fetch some of the archives. Any suggestions to get this going?

Ty

[pburgess]

Hmm...afraid I'm away from my Pi at the moment, but will try to help. Is this using the Occidentalis distribution or something else? And could you copy-and-paste the exact error messages here? (Or just an initial subset, if the list is hugely long.) Might also try:

Code: Select all

sudo apt-get update
sudo apt-get upgrade

to bring everything else up to date, then try installing python-imaging-tk again.

[scooter1015]

The update did the job, Thanks! The board must have had an issue talking with some of the mirrors to get the downloads. I tried to redownload the whole package a few times, but didn't have success until I used the update command instead! Thanks again!

[thebignasty]

my coding experience is dated and python is new to me. i am getting two different errors-one is file "lightpaint.py", line 54 SyntaxError: Non-ASCII character '\xc2' in file lightpaint.py on line 54 but no encoding declared;

then if i add # -*- coding: utf8 -*- i get the following error
file "lightpaint.py" line 54 spidev.write(column[x]) indentationError: expected an indented block

any ideas? thanks in advance

[thebignasty]

k-i worked through the code and got the syntax correct. i run the program and it says that it is displaying. the led light strip just stays solid white. i double checked to make sure i am on the correct pins. i am a soldering novice as well-but the wires seem to be soldered well. any suggestions?

[tdk1007]

I'm having the same issue. The code looks correct, but nothing is happening with the light strip, it just stays a solid white.

I tried using these scripts as well
https://github.com/trizz/PiLed

but the Pi does not seem to communicate with the light strip.
Any suggestions? I'm using Occidentals, just updated & upgraded the apt-get, and grabbed the python-imaging-tk again.

[apophisnico]

Hi all,

I have a problem too. I checked all the connections, voltage .. no problem
I am using occidentalis 0.2; with lsmod i am seing my spidev module. A modprobe do nothing... I saw no error in /var/log/messages...

The python script write "displaying" but i have nothing...leds stay off.
I tested too with a raspbian wheezy with spi module activated and the result is the same but unique difference that i have 4 leds light on when i plug the pi to the sector.

Piled python scripts don't work too.

I am using one meter of leds (32 leds)

an idea?

thank you
PS: sorry for my english