WS2812B Without SPI

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Gordon
Just to add, on a recent version of Espruino on MDBT42 I did:
```
require("neopixel").write(D16, new Uint8Array(15))
require("neopixel").write(D18, new Uint8Array(15))
```
And it works fine - so as others have said this could well be an electrical issue. Those LED strings can draw a bunch of power when on.

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