Datasheet

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The above declares two distinct NeoPixel objects, one each on pins 5 and 6, each containing 16

pixels and using the implied default type (NEO_KHZ800 + NEO_GRB).

Can I connect multiple NeoPixel strips to the same Arduino pin?

In many cases, yes. All the strips will then show exactly the same thing. This only works up to a

point though…four strips on a single pin is a good and reliable number. If you need more than

that, individual NeoPixels can be used as buffers to “fan out” to more strips: connect one Arduino

pin to the inputs of four separate NeoPixels, then connect each pixels’ output to the inputs of four

strips (or fewer, if you don’t need quite that many). If the strips are 10 pixels long, declare the

NeoPixel object as having 11 pixels. The extra “buffer” pixels will be at position #0 — just leave

them turned off — and the strips then run from positions 1 through 10.

I'm getting the wrong colors. Red and blue are swapped!

When using through-hole 8mm NeoPixels (or V1 Flora pixels), use NEO_RGB for the third

parameter in the Adafruit_NeoPixel declaration. For all other types of NeoPixels, use NEO_GRB.

The colors fall apart when I use setBrightness() repeatedly!

See note above; setBrightness() is designed as a one-time setup function, not an animation

effect.

Pixels Gobble RAM

Each NeoPixel requires about 3 bytes of RAM. This doesn’t sound like very much, but when you

start using dozens or even hundreds of pixels, and consider that the mainstream Arduino Uno only

has 2 kilobytes of RAM (often much less after other libraries stake their claim), this can be a real

problem!

For using really large numbers of LEDs, you might need to step up to a more potent board like the

Arduino Mega or Due. But if you’re close and need just a little extra space, you can sometimes

tweak your code to be more RAM-efficient. This tutorial has some pointers on memory

usage. (http://adafru.it/coj)

Adafruit_NeoPixel strip_a = Adafruit_NeoPixel(16, 5);

Adafruit_NeoPixel strip_b = Adafruit_NeoPixel(16, 6);