Author Topic: Is picap considered a e1.31 controller and pixel count question  (Read 1695 times)

Offline jerryinmich57

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ok when I set up my controller in vixen or xlights and plan on using a picap on my pi3b, do I tell it the pi player is a e1.31 controller?
second I believe if I am using nodes a 50 string line is considered 50 pixels and 150 channels but if I have a 5m pixel strip with 30leds/m and 10 pixels/m is that still 150 channels or more?
last thing I have read power injection after 100 nodes. does that mean a 5/m strip needs power after 100 leds or 2- 5/m strips before needing more power do you count leds or pixels.
Thanks
Jerry

Offline jerryinmich57

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Re: Is picap considered a e1.31 controller and pixel count question
« Reply #1 on: March 03, 2017, 12:54:32 PM »
OK so I did some more looking and found a post that said the picap runs as a e1.31 when put in bridge mode (something new to learn) so maybe got that part answered.

Offline JonB256

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Re: Is picap considered a e1.31 controller and pixel count question
« Reply #2 on: March 03, 2017, 01:27:10 PM »
The strip you describe is 3 leds per pixel. So 10 pixels per meter @ 5 meters. It will program as 150 channels. While you may be ok to power that from just the input, it may have low voltage problems at the end (flicker or pinkish tint) but you can power inject at the end.

Offline jerryinmich57

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Re: Is picap considered a e1.31 controller and pixel count question
« Reply #3 on: March 04, 2017, 03:33:32 AM »
So if I understand right the channel count goes off the number of chips which are the pixels in the strip times 3 not the number of leds.
But power requirement goes off the number of leds in the strip. Simple enough.
Thanks
Jerry

Offline JonB256

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Re: Is picap considered a e1.31 controller and pixel count question
« Reply #4 on: March 04, 2017, 05:25:32 AM »
So if I understand right the channel count goes off the number of chips which are the pixels in the strip times 3 not the number of leds.
But power requirement goes off the number of leds in the strip. Simple enough.
Thanks
Jerry

For 12v strips, using WS2811 chips, that is how channel count would be determined.
For 5v strips, using WS2811 chips, it is one chip per LED instead of 3.

but, there are 12v strips that use the TM1809 chip (and the TM1809 functions exactly like the WS2811) that can handle 3 LEDs per chip (making them act more like the 5v strips).
I'm not mentioning that to confuse you, but there are a lot of variations out there. :)

Offline jerryinmich57

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Re: Is picap considered a e1.31 controller and pixel count question
« Reply #5 on: March 04, 2017, 04:07:25 PM »
So if I understand right the channel count goes off the number of chips which are the pixels in the strip times 3 not the number of leds.
But power requirement goes off the number of leds in the strip. Simple enough.
Thanks
Jerry

For 12v strips, using WS2811 chips, that is how channel count would be determined.
For 5v strips, using WS2811 chips, it is one chip per LED instead of 3.

but, there are 12v strips that use the TM1809 chip (and the TM1809 functions exactly like the WS2811) that can handle 3 LEDs per chip (making them act more like the 5v strips).
I'm not mentioning that to confuse you, but there are a lot of variations out there. :)


I am planning to stick with 12 volt WS2811 strips and bullets or nodes no need for me to mix them up with 5 volts as I am learning all of this new so I need to keep it simple,
 But I thank you for that bit of info.
Thanks
Jerry

Offline gadgetsmith

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Re: Is picap considered a e1.31 controller and pixel count question
« Reply #6 on: March 05, 2017, 05:33:55 AM »
OK so I did some more looking and found a post that said the picap runs as a e1.31 when put in bridge mode (something new to learn) so maybe got that part answered.
there are multiple ways to run the picap depending on your set-up.  you can run a pi with picap as an e1.31 controller when in bridge mode, yes.  but, if you're using the pi to run your show (standalone or master mode) you simply need to set the start channel of the outputs to the absolute start channel your using in your sequencer.  in this case, those channels will get directed to the gpio pins, rather than output over e1.31 to some other controller.

Offline Turtledove

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Re: Is picap considered a e1.31 controller and pixel count question
« Reply #7 on: March 06, 2017, 02:40:11 PM »
I am also new to pi cap,


currently my plan is to run a master and several slaves with the show files on a flash drive on each pi3b.


Planning to run wirelessly (though I think I have read that the picap can interfere with the wifi signal).


My question is: how many nodes can I run off each ws28xx port on the pi cap?  (forget power, I will power inject)


Is it just 1 universe, 512 (510) channels/170 pixels per ws28xx port or am I applying the wrong type of logic?  I've read specs/postings saying 800 channels per port.  I guess maybe the whole RGB/Universe world may not apply and I need to adjust my thinking.  It's hard to visualize with everything on order and nothing on hand to test/play with.  Any links to videos or documents is appreciated.  I have searched but I'm not hitting the right things I fear.


FYI I am running WS2811 bullet nodes.


Thanks for any guidance, very much appreciated.
« Last Edit: March 06, 2017, 02:50:47 PM by Turtledove »

Offline rlemery

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Re: Is picap considered a e1.31 controller and pixel count question
« Reply #8 on: March 06, 2017, 03:34:27 PM »
You can run 800 to 1000 pixels off each output on the picap. That would be 2400 to 3000 channels. Power injection required approximately every 125 pixels. Your mileage may very. Some have to inject every 100 and others get away with 150.   

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Offline gadgetsmith

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Re: Is picap considered a e1.31 controller and pixel count question
« Reply #9 on: March 07, 2017, 04:24:02 AM »
800 is the maximum allowable in the console at the moment, but you can edit a file manually if you want to try more, although i'd suggest staying at 800 as beyond that you can get occasionally flickering.

rlemery suggestions for power injection are good for 12v, but plan on injecting every 50 if using 5v pixels.

 

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