SOLVED: Adafruit neopixel ring and capacitors.

Sorry don't have an Adafruit forum account.

On the Adafruit web site the is a warning that there must be a big capacitor across the light rings + and - terminals. as this is powered by the same supply as an arduino (5V) would a 1F 5.5v electrolytic capacitor be ok? (yes thats 1 farad!)

Their site specifies 1000uF (not 1 farad) and 6.3V or higher.

You can read about it here:

“Before connecting a NeoPixel strip to ANY source of power, we very strongly recommend adding a large capacitor (1000 µF, 6.3V or higher) across the + and – terminals. This prevents the initial onrush of current from damaging the pixels.”

Definitely not 1F, you'd have to wait rather a long time for the 5V rail to rise... Also you need reasonable low ESR for decoupling and dual-layer caps may not be good enough.

MarkT: Definitely not 1F, you'd have to wait rather a long time for the 5V rail to rise... Also you need reasonable low ESR for decoupling and dual-layer caps may not be good enough.

Thanks MarkT, that what I wanted to check, I'll go back and look for the recommended cap.

johnwasser: "This prevents the initial onrush of current from damaging the pixels."

That is a very bizarre and confused explanation of something or other. But what?