adafruit-circuitpython-neopixel 3.3.4

CircuitPython library for NeoPixel LEDs.

Adafruit CircuitPython NeoPixel

Higher level NeoPixel driver that presents the strip as a sequence. This is a supercharged version of the original MicroPython driver. Its now more like a normal Python sequence and features slice support, repr and len support.

Colors are stored as tuples by default. However, you can also use int hex syntax to set values similar to colors on the web. For example, 0x100000 (#100000 on the web) is equivalent to (0x10, 0, 0).

Note

The int hex API represents the brightness of the white pixel when present by setting the RGB channels to identical values. For example, full white is 0xffffff but is actually (0, 0, 0, 0xff) in the tuple syntax. Setting a pixel value with an int will use the white pixel if the RGB channels are identical. For full, independent, control of each color component use the tuple syntax.

Dependencies

This driver depends on:

• Adafruit CircuitPython

Please ensure all dependencies are available on the CircuitPython filesystem. This is easily achieved by downloading the Adafruit library and driver bundle.

Usage Example

This example demonstrates the library with the single built-in NeoPixel on the Feather M0 Express and Metro M0 Express.

import board
import neopixel

pixels = neopixel.NeoPixel(board.NEOPIXEL, 1)
pixels[0] = (10, 0, 0)

This example demonstrates the library with the ten built-in NeoPixels on the Circuit Playground Express. It turns off auto_write so that all pixels are updated at once when the show method is called.

import board
import neopixel

pixels = neopixel.NeoPixel(board.NEOPIXEL, 10, auto_write=False)
pixels[0] = (10, 0, 0)
pixels[9] = (0, 10, 0)
pixels.show()

This example demonstrates using a single NeoPixel tied to a GPIO pin and with a pixel_order to specify the color channel order. Note that bpp does not need to be specified as it is computed from the supplied pixel_order.

import board
import neopixel

pixel = neopixel.NeoPixel(board.D0, 1, pixel_order=neopixel.RGBW)
pixel[0] = (30, 0, 20, 10)

Contributing

Contributions are welcome! Please read our Code of Conduct before contributing to help this project stay welcoming.

Building locally

To build this library locally you’ll need to install the circuitpython-build-tools package.

python3 -m venv .env
source .env/bin/activate
pip install circuitpython-build-tools

Once installed, make sure you are in the virtual environment:

source .env/bin/activate

Then run the build:

circuitpython-build-bundles --filename_prefix adafruit-circuitpython-neopixel --library_location .

Sphinx documentation

Sphinx is used to build the documentation based on rST files and comments in the code. First, install dependencies (feel free to reuse the virtual environment from above):

python3 -m venv .env
source .env/bin/activate
pip install Sphinx sphinx-rtd-theme

Now, once you have the virtual environment activated:

cd docs
sphinx-build -E -W -b html . _build/html

This will output the documentation to docs/_build/html. Open the index.html in your browser to view them. It will also (due to -W) error out on any warning like Travis will. This is a good way to locally verify it will pass.