This is kind of the viewtopic.php?f=9&t=2463 big brother. It has USB power input and output, along with two lots of mirrored WS2812 (Neopixel), RGB LED outputs. There is provision to solder three wires for say a black JST cable to run direct to a RGB LED string.
3V or 3.3V Data can be fed in via a dupont connector, or there is provision for you to solder on your own alligator plug. Same for the 3V or 3.3V power input.
This was made specificity for people playing around with the Microbit platform and RGB Neopixel strings of LEDs. Here is the schematic:
And the finished small 33.5mm x 19mm PCB:
Thanks again to Steamhead (James and Carrie) for sponsoring the PCB manufacture and shipping fees.