Hello Sparkers!
I’m working on a project that runs a group of 10 x 9-led sections of ws2812b that are spaced about 8 feet apart.
I am using 12v strips with injection points, but need a strong enough 5v data signal to run the whole line.
Currently using an Uno with a 12v 5A power supply for the board, and a 12v 10A supply for the power rails, both sharing a common ground through the Uno’s ports.
How, good folks, do I get the data signal strong enough to pass to the end?
You cannot inject 5v along the data line, can you?
Thanks for reading!
Since very little current flows on the data line, you don’t need to worry about voltage drop, just make sure you don’t have any breaks or shorts in your data wire. You can’t inject 5 volt power on the data line, that would short out your micro controller when it sends a data low.
Excellent! Thank you for the advice!
Yeah I figured 5v injection on the data (TTL?) line was a bad idea; at best it would scramble the data or at worst fry some chips with unregulated full current 
I must have a different problem, as I cannot get further than 2 x 9ft cables and 2 x 9-led strips without the data going wonky.
Could you somehow test a cut section of strip’s data line throughput with a multimeter?