Datasheet

Powering NeoPixels
NeoPixels are usually described as “5 Volt devices,” but the reality is a little more nuanced than that.
Some (not all) NeoPixel products can work with slightly higher voltages. This depends on the additional support
components around the chip, based on available space, cost and the most likely application. Refer to the specific
product description page for guidance on acceptable voltage limits for each type. When in doubt, aim for 5 Volts.
Lower voltages are always acceptable, with the caveat that the LEDs will be slightly dimmer. There’s a limit below
which the LED will fail to light, or will start to show the wrong color.
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.
For many wearable projects we recommend a lithium-
polymer battery (http://adafru.it/328). These deliver 3.7
Volts — perfect for directly feeding low-power
microcontrollers such as the Adafruit Flora, yet enough
voltage to run a short length of NeoPixels.
When connecting NeoPixels to any live power source or microcontroller, ALWAYS CONNECT GROUND (–)
BEFORE ANYTHING ELSE. Conversely, disconnect ground last when separating.
Adding a 300 to 500 Ohm resistor between your microcontroller's data pin and the data input on the first
NeoPixel can help prevent voltage spikes that might otherwise damage your first pixel. Please add one
between your micro and NeoPixels!
© Adafruit Industries https://learn.adafruit.com/adafruit-neopixel-uberguide Page 35 of 68