Is it possible to chain ws2813 and ws2812 pixels together? My Ws2813 strip seems to need data fed in at both ends or it won’t work. Trying to get my head around this!
Are you sure you are using the correct end? Not that I have done something like this myself… 
Yeah that’s strange. My understanding is that data has to flow only one way. I use 2813 strips primarily and have never seen this problem.
To answer your question — I haven’t tried mixing 2812 and 2813 but theoretically I think it should work as the data signal should be the same, just with the extra backup signal on the 2813.
@Thomas_Balu_Walter there’s a right end? That would explain it then 
. Do you have to send the data to both ends to get the back up or is it already wired like that? Guess I should read the spec
One end is usually marked as data in or the strip has arrows pointing in the direction of the data flow. The protocol selects one led after the other. That wouldn’t work from both sides.
Yeah you only send the data from the upstream end. You send the same data signal to both the Data In and Backup In. So you can just “fork” the output from your controller and split it between those inputs. (Power can be fed from either end. )
Hmm right ok. ‘This strip’ is encapsulated in silicone so I can’t see what’s going on inside. Its only got three input wires though. I wonder if the data wire is fixed to the data and back up? Guess I’ll have to open it up.
This might help: http://doityourselfchristmas.com/forums/showthread.php?45520-WS2813-WS2818-how-backup-input-works
@Gavin_Morris it looks like one end has 2 connectors (JST and a DC barrel plug) and the other end just has the JST. Usually the DC plug is at the “starter” end, so my guess is that you want to apply data to that end. Of course, it should be pretty easy to try both and see which works.