https://github.com/nkolban/node-neopixel-utils

NeoPixel utilities for Node.js
https://github.com/nkolban/node-neopixel-utils

Last synced: about 1 month ago
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NeoPixel utilities for Node.js

• Host: GitHub
• URL: https://github.com/nkolban/node-neopixel-utils
• Owner: nkolban
• License: gpl-3.0
• Created: 2016-08-09T03:23:09.000Z (about 8 years ago)
• Default Branch: master
• Last Pushed: 2016-10-03T22:54:12.000Z (almost 8 years ago)
• Last Synced: 2024-08-17T02:21:15.842Z (about 2 months ago)
• Language: JavaScript
• Size: 14.6 KB
• Stars: 8
• Watchers: 2
• Forks: 4
• Open Issues: 1
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# node-neopixel-utils

A Node.js module that provides a set of NeoPixel (ws2812) utilities.

When we think of a NeoPixel, we see it as an LED with 24 bits of data that define

its color.  There are 8 bits for red, 8 bits for green and 8 bits for blue.  However,

we generally don't work with just one NeoPixel but instead work with a "strip" of them

where each NeoPixel is daisy-chained to the next one.  When we want to set the value of

one NeoPixel, we need to actually set the value of all of them as a single operation.

This means that we need to remember the "state" of all the pixels and that is where

this module comes into play.

 

The module exposes a function called "Strip" that, when called, returns a logical

representation of a strip of NeoPixels of a given length (count of pixels).  The

return is an object with methods upon it to get and set pixels that are then remembered

by the strip object.  When ready, we can then ask that object for a Buffer containing

the data for all the pixels.

 

The functions and properties exposed by the strip object are:

* `buffer`  - A Buffer object representing the data of the pixels.

* `pixelCount`  - The number of pixels in the strip.

* `setPixelColor(index, color)` - Set the pixel at the given index to the specified color.

* `getPixelColor(index)` - Return the color of the pixel at the given index.  The result

is an RGB array.

* `off()` - Set the colors of all pixels to off.

* `on(color)` - Set the color of all the pixels to the supplied color.

 

A color can be supplied in a few formats.  These include:

* `[R, G, B]` - A 3 number array where each number is between 0 and 255.

* `"#RRGGBB"` - A 6 character hex string

* `"blue"` - A CSS color name

* `"rgb(200, 200, 200)"` - A string representing and RGB color value

* `"hsl(360, 100%, 50%)"` - A string representing the HSL color value