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128 Square Pixel Nodes v12 Power Injection Needed?

Started by Michael, October 30, 2016, 02:22:19 PM

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I am building a matrix 32 x 16 = 512 nodes.  I want to run each string using 128 nodes square 12v pixels.  My question, will I need to use power injection? 

Here are the nodes I am using.


Maybe,  I run 128 nodes of TM1804 12mm bullets that are now 4 yrs old.  They work fine off of 1 output with power via the controller.  My nodes came from Ray Wu.
Jim Nealand
Kennesaw, GA all Falcon controllers, all 12v Master Remote Multisync with Pi and BBB P10 and P5


I ran some test tonight on one string of 128.  They work, but sometimes, the last 10 don't change color at the right time for a few cycles.  Happens about 5% of the time.  Would that indicate an issue with power?


From what I have read on this board for every 100+ pixel they say add some power. Now I have not tested this yet because I am waiting on my controller, so basically as stated anything over 100 in the same string use some extra power. I know the board will do over 300 per port but you will still need some extra power..

Raspberry pi - 1 Main
1 x F16V2-R Pixel Controller


I will be running 120 length matrix columns using WS2811 square nodes.   I checked the lengths and found them to be fine without power injection (powered from the controller outputs)


It all depends on the lights. Wire gauge plays a role, distance between nodes, etc. There is no magic number that works no matter what. I've gone 120 without power injection. Actually I've gone more, but then I start to color issues (white becomes pink, etc.). Nodes not changing color at the right time doesn't sound like a power injection problem, more like data. But one way to find out, inject power.

Also, put a meter at the beginning and the end to see your voltage drop.


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