ok I'm not sure what's going on here, but I'm currently in the middle of making an oversized 7 segment display clock using a total of 172 WS2812B's.
I've got each digit wired up properly... ran the Adafruit Neopixel sample code to test and all 21 LEDs per digit lit up in the manner they were supposed to.
I then connected 4 of these digits together, and again everything lit up properly as expected.
that's where my trouble then began. Due to some stupidity on my part I thought my arduino would be more than capable of powering 172 LEDs. of course it wasn't. it would either light about 100 or so, and reset, or it'd light them all, but dim once it hit about 100 pixels.
so I then added a secondary 5v USB power, and connected the LEDs directly to that and just ran the data signal from the arduino to the LEDs. from there, all LEDs just lit up in random flashing patterns. not in the order they were supposed to from code.
I ripped all the interconnecting wiring out and got it back to it's original state. since I figured originally I must have cross wired things somewhere, I went back and reconnected the LEDs to a separate 5v 12A PSU. again all the lights seem to be going haywire.
what am I doing wrong here? I read and figured the arduino wasn't capable of powering that many LEDs, and other suggestions have said I should use a separate power supply, and power the LEDs at different intervals. which I'm now doing. I've got about 42-44 LEDs powered in parallel off my PSU, but since I didn't modify the data line, there's no reason I can see that the lights should be going crazy. do I need to put the 5v and gnd from the arduino into the LED strip as well as the 5v 12A PSU? seems a little odd to do that, but I've no idea what's going on
any help would be greatly appreciated.