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    scanlime on master

    Tidying up examples/html/random… Merge pull request #124 from pl… (compare)

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    scanlime on master

    changed startup type to exec clarified installation process Added reference to new systemd … and 2 more (compare)

Micah Elizabeth Scott
@scanlime
yeah, you’ll want to know 1) is the device that you’re seeing the bootloader or the regular fc device, and 2) does windows have a driver loaded
fadecandy uses the generic WinUSB driver which should load automatically, but you can try doing this part manually
there’s a utility called Zadig that might come in handy if that turns out to be the problem
David Sandler
@dsandlerm_twitter
Hello! Im trying to create a video led wall using 6 fadecandys and 48 strips of 64 leds... the problem im having is mapping out the fadecandys on the server so it can recognize where each fadecandy is located and what light up accordingly. Everytime i reboot the system and leave the fadecandys connected to the usb hub, the server seems to arrange the fadecandys in its own way without respecting my mapping
By the way, im using raspberry pi 3 model b... i would deeply appreciate your help on this subject
Blurpy-the-RABID
@Blurpy-the-RABID
Greetings all. I've got a simple question regarding the FadeCandy controller board. Is it compatible with WS2812B LED strips? My google searches have led me to believe that others may have gotten their FadeCandy boards to play nice with WS2812B LED strips, but I'm currently having a hard time getting mine to light up.
I'm following the ol' tutorial here (except that I'm using WS2812B LEDs instead of the Neopixel matrix) to do my wiring and software installation: https://learn.adafruit.com/led-art-with-fadecandy?view=all
I've gotten everything installed, and all of my hardware is hooked up. I've tested my wiring via a multimeter to confirm their conductivity, and all is good to go. My FadeCandy board lights up when told to identify itself, as well as when I give it the basic command to illuminate at 50% or full brightness. The only problem is that the LED strips simply won't light up.
Do I need some custom WS2812B library to get the FadeCandy to talk to the LEDs?
Stephen Marsh
@stephenhmarsh

@Blurpy-the-RABID -- you might want to see this post: https://forums.adafruit.com/viewtopic.php?f=47&t=93354

different LEDs use different numbers of bits to address/control them depending on how many channels, making fadecandy incompatible

David Sandler
@dsandlerm_twitter
If i need a usb hub for my fadecandys that connect to the raspberry pi... is there a special one i should be looking for?
Stephen Marsh
@stephenhmarsh
omg i finally got time over this long weekend to play around with fadecandy and processing and it's kind of blowing my mind how awesome this is. thank u so much micah
Stephen Marsh
@stephenhmarsh
does anyone have any favorite methods for color and gamma correcting your LEDs ??? i'm about to just put some gamma calibration charts in a processing sketch and see if i can eyeball it?
George Ioakimedes
@GeorgeIoak
I don't a lot of activity here but I thought I would post as a follow up to my post on the google group (https://groups.google.com/forum/#!topic/fadecandy/KQgUYfmqZ2M). I am willing to hire someone to help with this project which may not have been clear in my post
Micah Elizabeth Scott
@scanlime
@dsandlerm_twitter realize this is a very late reply, but.. you can write an fcserver config that matches each fadecandy board by its serial number, so it doesn't matter what order they connect in or even whether they're all connected at boot
@GeorgeIoak from your post it's hard to tell what the scope of the project would be. relatedly maybe, if what you're looking for is exactly like glediator, why not use glediator? if it isn't, what's the key difference?
George Ioakimedes
@GeorgeIoak
@scanlime I need to kind of do a proof of concept that's initially for this 28"x28" panel. "They" have talked about another installation that will be a ~9'x9' wall. They initially worked with a supplier but when they wanted the effects to change the supplier had to go back try to get China to make changes.
My thought was to first create a hardware solution that could grow to different sizes by connecting tiles. Then I saw the Glediator software and thought it would be great to be able to offer something like this so it's easy to create the show you want and then download that to the installation
Micah Elizabeth Scott
@scanlime
hmm, to make an analogy, this is like giving some information about what kind of printer you have and then asking if anyone wants to design something like photoshop for you. the software will depend a lot on the expectations and needs of the people who control it as well as the style of effects or art they're going for
George Ioakimedes
@GeorgeIoak
OK, so slap on the wrists for not explaining things well ;)
The effects I saw were very similar to the examples I've seen run on your board (BTW, I think I have one of your original boards from when you were still in SF, the bag has your decal with "FadeCandy 1/2013" written on the back.
Micah Elizabeth Scott
@scanlime
i'm sorry, not trying to give you a slap on the wrist, just trying to explain
i'm saying that the request is basically design a creative software package, and creative software needs to be either pretty general (which takes a lot of work or a skilled user) or pretty opinionated (which requires knowing what direction to code in)
it's a big ask, the 'idea' for writing a program like this is very vague compared to the specific design that will be necessary to decide what to code
George Ioakimedes
@GeorgeIoak
OK, I hear you. I saw the Glediator software and that looked like it could probably handle anything that I could think of would be requested. It just appeared to be a dead project and was a bit surprised that the open source community hadn't done something similar. I sent you a PM of what the first project would be so take a look at that. I just didn't want that floating out in space since you might be able to recognize where it would end up
Micah Elizabeth Scott
@scanlime
if you want a smaller scope than designing an entirely new piece of creative software, you could make something compatible with existing software. some people use video files for this, or DMX512/Artnet
George Ioakimedes
@GeorgeIoak
I wanted this to first be something that could be standalone and not require software to be running on a PC/MAC. Since fadecandy works off of a RPi that seems to be a good choice that should have enough processing power to run the show. I didn't see a way to "import" a picture into fadecandy, add effects, and have that displayed on the matrix. Am I right about that and this is where the extra software would come into play? Creating a video seems like a logical way to run something like this. Just create your show and play the video file in an endless loop and whatever is playing the video is actually outputting to the fadecandy instead of a display
David Sandler
@dsandlerm_twitter
Question:
If I want to develop a matrix that doesn’t add up to 64 leds per strip (it uses half), can I map out double the amount of led strips with half the leds on a single fadecandy? (16 strips of 32 leds)
Stephen Marsh
@stephenhmarsh
@dsandlerm_twitter -- yes but it might complicate the way you're thinking about this matrix in terms of lines/strips if done on a single fadecandy. you could add a 2nd fadecandy and map each data out of the two fadecandies to exactly one of the 16 strips. if you stick with just one fadecandy, you'd had to get 2 strips/lines of the matrix per one data out. this might make spatially mapping the pixels in your code a bit of a headache but could be done by linking two LED strips/rows at a time via the data wire.
i suggest reading the documentation for the fcserver.json file and look at how the fcserver.json file is configured in some of the examples.... that's kind of the lower-level map of the contiguous pixels and their indices.
Stephen Marsh
@stephenhmarsh
if you're using Processing, for example, and the OPC library, you can set the strips/pixels in your code layer to be independent "lines" and non-contiguous, even though the actual hardware thinks they're one long strip
David Sandler
@dsandlerm_twitter
Thank you! Very helpful!
Do you know if it’s possible to run 12 fadecandys on a single raspberry pi?
Stephen Marsh
@stephenhmarsh
@dsandlerm_twitter - i'm not sure the limits of your r pi but the fadecandy documentation explains what will limit you in general: https://github.com/scanlime/fadecandy#what-are-the-limits-how-big-can-fadecandy-go --- in micah's ardent mobile cloud project i believe they used 5 fadecandies off of one pi and a usb hub
David Sandler
@dsandlerm_twitter
Thanks again!
Stephen Marsh
@stephenhmarsh
@dsandlerm_twitter -- welcome, glad to help. btw my understanding is that the power requirements of lots and lots of pixels starts to get a lil scary: https://learn.adafruit.com/1500-neopixel-led-curtain-with-raspberry-pi-fadecandy
David Sandler
@dsandlerm_twitter
Does the SK6812 addressable led strip work with FadeCandy?
I had wondered out loud in the live channel why there was not a 3v3 led module out in the wild
turns out there is (at least now)
Micah Elizabeth Scott
@scanlime
that’s a 5V chip
the 3.2v is Vf for two of the led chips. data sheet still lists 5V as the supply voltage
i’d be surprised to see 3.3v RGB leds, the Vf is just too close to the supply to leave room for a constant current controller, you probably have close to zero headroom with worst case Vcc and Vf
David Sandler
@dsandlerm_twitter
Did anybody get an answer regarding working fadecandy with Ubuntu?
Josephmanuel1989
@Josephmanuel1989
With ubuntu (18) dont worked, i installed version 16 and worked without problem.
David Sandler
@dsandlerm_twitter
Awesome! Thanks for the tip
David Sandler
@dsandlerm_twitter
Hello!
Im developing an image that divides into 22 strips of 22 leds.
The fadecandy server lights up the whole thing, but for some reason when I connect to the OPC it doesn’t.
I copied the same file from the server but it won’t display the whole image
Josephmanuel1989
@Josephmanuel1989
What is the sample that you are openning in OPC?
with this example, all LEDs are off?
Can you post the configuration of server?
chris1seto
@chris1seto
Just curious, has anyone used OpenOCD to program the K20 recently?
I'm normally an STM32 developer, so I'm still getting used to the K20, but it looks like there may be some issue with OpenOCD when the flash is read locked. I see mentions of a patch in the openocd config file, but everything appears to be completely out of date at this point.