Originally Posted by crevice
has a few suggestions on powering long LED strips. I hope they are helpful.
Look forward to your final design.
Are you going to mount the LEDS on MDF ? That black square on your pictures.
Thanks, it's really simple actually, the +5V and GND are just rails (just copper traces running through the LED strips), but as 180 LEDs consume up to 7.5A and with 5V supply there isn't much headroom, I believe these LEDs require 3.6V (at least one of the colors) for full intensity (~20mA) so with a 3M long copper trace it's expected the resistance and load will create a voltage drop, and it appears to be more than 1.4V at full load.
So what I did was simply connecting the power like this:
That solves the problem and the voltage drop will be minimal, and have no effect as the ws2811 controllers use current sensing. If using very long strips, e.g. 5-6 meters, it would make sense to also inject supply in the middle of the strip and use some thick wires for the supply.
I just use thin double sided tape to mount the LEDs, works fine. (the black square is a floor tile