rpi-ws281x/examples/fill-with-color.js

rpi-ws281x

var ws281x = require('../index.js');

class Example {
	constructor() {
		this.config = {};

		// Number of leds in my strip
		this.config.leds = 169;

		// Use DMA 10 (default 10)
		this.config.dma = 10;

		// Set full brightness, a value from 0 to 255 (default 255)
		this.config.brightness = 255;

		// Set the GPIO number to communicate with the Neopixel strip (default 18)
		this.config.gpio = 18;

		// The RGB sequence may vary on some strips. Valid values
		// are "rgb", "rbg", "grb", "gbr", "bgr", "brg".
		// Default is "rgb".
		// RGBW strips are not currently supported.
		this.config.stripType = 'grb';

		// Apply a gamma correction to account for the non-linear brightness
		// of the LEDs. A typical value is 2.2
		this.config.gamma = 2.2;

		// Configure ws281x
		ws281x.configure(this.config);
	}

	run() {
		// Create a pixel array matching the number of leds.
		// This must be an instance of Uint32Array.
		var pixels = new Uint32Array(this.config.leds);

		// Create a fill color with red/green/blue.
		var red = 255;
		var green = 0;
		var blue = 0;
		var color = (red << 16) | (green << 8) | blue;

		for (var i = 0; i < this.config.leds; i++) {
			pixels[i] = color;
		}

		// Render to strip
		ws281x.render(pixels);
	}
}

var example = new Example();
example.run();