WS2812 datasheet(86/98 Pages) RASPBERRY-PI

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Once that's done, from your command line run the following command:

sudo pip3 install adafruit-circuitpython-neopixel

If your default Python is version 3 you may need to run 'pip' instead. Just make sure you aren't trying to use

CircuitPython on Python 2.x, it isn't supported!

CircuitPython & Python Usage

To demonstrate the usage of this library with NeoPixel LEDs, we'll use the board's Python REPL.

Run the following code to import the necessary modules and initialise a NeoPixel strip with 30 LEDs. Don't forget to

change the pin if your NeoPixels are connected to a different pin, and change the number of pixels if you have a

different number.

import board

import neopixel

pixels = neopixel.NeoPixel(board.D5, 30)

# Feather wiring!

# pixels = neopixel.NeoPixel(board.D18, 30) # Raspberry Pi wiring!

Now you're ready to light up your NeoPixel LEDs using the following properties:

brightness - The overall brightness of the LED

fill - Color all pixels a given color.

show - Update the LED colors if auto_write is set to False .

For example, to light up the first NeoPixel red:

pixels[0] = (255, 0, 0)

To light up all the NeoPixels green:

pixels.fill((0, 255, 0))

For NeoPixels to work on Raspberry Pi, you must run the code as root! Root access is required to access the

RPi peripherals.

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

Page 89 of 101

WS2812 Scheda tecnica(PDF) 86 Page - Raspberry Pi Holdings PLC