So after many hours reading and searching I would like a definitive answer for my simple(?) wiring set up please.
I have an Arduino UNO R3 with 2 x WS2812b strips of 30l/m.
I am making two arch strips with 86 leds each. Total = 172 leds
Each strip will be controlled separately (using Pin 12 and Pin 13).
My initial calculations are as follows and I am happy with this so far (with some more tweaking).
Full bright(256) = 60ma * 172 = 10.3 amps (I will not use all white so this is worse case…)
I will reduce brightness to 100 in my code, 100/256 * 60 *172 = 4.03amps
My issue is do I want them powered separately using 2 x 5volt 4amp power supplies, or just use one in the centre of my project. I would like to consider both wiring options please.
I know we need to tie the grounds, but do I just join ALL the ground wires to each other and the Arduino?
Does this interfere with the Data of the separate strips somehow?
My Diagram shows 2 power supplies - it is only my starting point.