Datasheet

set to True, where every change is immediately written to the strip of pixels, this is easier to use but

way

slower. if you

set auto_write=False then you will have to call strip.show() when you want to actually write color data out.

You can easily set colors by indexing into the location strip[n] = (red, green, blue) . For example, strip[0] = (100, 0, 0) will

set the first pixel to a medium-brightness red, and strip[2] = (0, 255, 0) will set the third pixel to bright green. Then, if you

have auto_write=False don't forget to call strip.show()

Verify the wiring on your strip or device - plugging into the 'DOUT' side is a common mistake! Wire up NeoPixels only

while the Circuit Playground Express is not on, to avoid possible damage!

If the power to the NeoPixels is > 5.5V you may have some difficulty driving some strips, in which case you may need

to lower the voltage to 4.5-5V or use a level shifter

We have a ton more information on general purpose NeoPixel know-how at our NeoPixel UberGuide

https://learn.adafruit.com/adafruit-neopixel-uberguide