a simple question,
i will need to add some input and output stuff to my arduino board, which will also need power ofcourse.
all this will draw a couple of amps, way more that what my arduino can supply so i will need to add a additional 5V power supply that will power all this.
concerning the connection i have a few questions (mainly because i see different setup options online)
let's take a ws2812b ledstip as example.
3 wires connected..
Din, 5V and Gnd
i saw 3 options:
DIN, to board and connect the external psu directly (and only) to the ledstrip, don't connect it to the arduino board
DIN, to board and connect the external psu directly to the ledstrip, AND connect that ground to the arduino board's ground.
DIN, to board and connect the external psu directly to ledstrip and arduino board, so both ground to ground and 5V to 5V arduino out (so parallel)
other option if the once above are not save.
anyway, how can i do this safely without blowing op my board.