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.

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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!

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