I made a lamp for a friend that runs 50 WS2812 LEDs from the 5v line on an Adafruit Pro Trinket.
I've run 44 before in this way without problems...but though the lamp starts up fine, after it's warmed up a little the LEDs start to flicker, especially if set to "all white" (255,255,255).
I think I'm overloading the 150mA that the 5v line can give, so I need a separate power source. However this is a problem as the lamp is designed to give access only to the micro USB on the processor, and changing that effectively means starting from scratch.
I believe there are "power pads" under the chip...but I've no room to solder on a JST connector. Is it possible to solder directly on to these pads, and will they deliver higher than 150mA if I do?
If not, is there some other way I can take a +ve and GND directly from the micro USB to power the LEDs and take advantage of the 1500mA capable input there, whilsts still powering the Arduino from the same socket?