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powerng neopixels from both ends
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powerng neopixels from both ends

by flounder on Wed Oct 04, 2017 11:19 pm

I have 8 5meter 30 leds/m strips. To power these, i have 10 5v 10A supplies (the rationale for this is that the strips are arranged as 176, 231, 250, 195, 195 and 113 LEDs and 10 supplies simplify the power distribution).

Someone suggested that I should feed power into both ends of the strip, e.g. instead of the simple
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P--> >----N.e.o.p.i.x.e.l.s.---->    P--> >---N.e.o.p.i.x.e.l.s.--->

that I do

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P-+-> >---N.e.o.p.i.x.e.l.s.---> >---+  P-+-> >---N.e.o.p.i.x.e.l.s.---> >---+
  |                                  |    |                                  |
  +----------------------------------+    +----------------------------------+

however, it occured to me that I might be able to avoid 5 meters of #20 wire for each strip if I were to wire them as
Code: Select all | TOGGLE FULL SIZE
P---> >---N.e.o.p.i.x.e.l.s.---> >---+---> >---N.e.o.p.i.x.e.l.s.---> >---+---> ...
                                     |                                    |
                                     P                                    P


The idea is that each power supply connects to the preceding and succeeding strips. I know that I could get away with this if I were using batteries, but I am less certain about active power sources, where I might end up with power supplies fighting each other.

The power supply is Adafruit #658. The neopixel strips are RGB (#1460)..

Is my idea of feeding power at both ends from different power supplies workable?

flounder
 
Posts: 236
Joined: Wed Sep 18, 2013 9:10 pm
Location: Pittsburgh PA

Re: powerng neopixels from both ends

by franklin97355 on Thu Oct 05, 2017 10:53 pm

You should not power one strip from two supplies.

franklin97355
 
Posts: 17079
Joined: Mon Apr 21, 2008 2:33 pm
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Re: powerng neopixels from both ends

by flounder on Fri Oct 06, 2017 2:13 am

That was my suspicion. I just needed a confirmation or refutation.
thanks
joe

flounder
 
Posts: 236
Joined: Wed Sep 18, 2013 9:10 pm
Location: Pittsburgh PA

Please be positive and constructive with your questions and comments.