node-rpi-rgb-led-matrix

Pilot your rgb led matrix with Nodejs on Raspberry Pi ! Nodejs binding of rpi-rgb-led-matrix library https://github.com/hzeller/rpi-rgb-led-matrix

Compatibility

NOTE: node-rpi-rgb-led-matrix should work across Node.js versions 0.8, 0.10, 0.12, 4 and 5 as it uses Native Abstractions. HOWEVER there is a problem with the Node.js version 0.10.29 packaged with Raspbian Jessie 2015-11-21 which breaks Native Abstractions. The easiest fix is to make a minor edit to your v8.js file; this and other solutions outlined on this Raspberry Pi Forum post.

Installation with npm

$ npm i node-rpi-rgb-led-matrix

Installation with git

$ git clone --recursive https://github.com/zeitungen/node-rpi-rgb-led-matrix.git
$ cd node-rpi-rgb-led-matrix
$ npm i

Get some Fun

var LedMatrix = require("node-rpi-rgb-led-matrix");

var matrix = new LedMatrix(16);
matrix.fill(255, 50, 100);
matrix.setPixel(0, 0, 0, 50, 255);

LedMatrix API

• Constructor: LedMatrix(rows, chainedDisplays, parallelDisplays) default values are rows=32, chainedDisplays=1, parallelDisplay=1
• getWidth() return current led matrix width
• getHeight() return current led matrix height
• fill(red, green, blue) fill the led matrix with color specified by red, green and blue. red, green and blue must be between 0 and 255
• setPixel(x, y, red, green, blue) set the color pixel at the position x,y with color specified by red, green and blue. red, green and blue must be between 0 and 255. x must be between 0 and getWidth(). y must be between 0and getGeight()
• clear() reset the led matrix display (shut down all leds)

Add specific defines for rpi-rgb-led-matrix

You can add specific defines for the rpi-rgb-led-matrix compilation.

You have to modify the binding.gyp file. In the rpi-rgb-led-matrix target add definesarray like this:

...
  {
			"target_name": "rpi-rgb-led-matrix",
			"type": "static_library",
			"sources": ["external/matrix/lib/bdf-font.cc",
				"external/matrix/lib/framebuffer.cc", "external/matrix/lib/gpio.cc",
				"external/matrix/lib/graphics.cc", "external/matrix/lib/led-matrix.cc",
				"external/matrix/lib/thread.cc"],
			"libraries": ["-lrt", "-lm", "-lpthread"],
			
			"defines": ["RGB_CLASSIC_PINOUT", "ONLY_SINGLE_CHAIN"],
			
			"include_dirs": [ "external/matrix/include" ],
	        "direct_dependent_settings": {
	            "include_dirs": [ "external/matrix/include" ]
	        }
		}
...

You have this defines possibility:

• INVERSE_RGB_DISPLAY_COLORS
• SHOW_REFRESH_RATE
• RGB_SLOWDOWN_GPIO=1 or RGB_SLOWDOWN_GPIO=2
• ADAFRUIT_RGBMATRIX_HAT
• ADAFRUIT_RGBMATRIX_HAT_PWM
• RGB_CLASSIC_PINOUT
• ONLY_SINGLE_CHAIN

Look at rpi-rgb-led-matrix Makefile for more details of this defines.

Don't forget to recompile:

$ cd /path/to/node-rpi-rgb-led-matrix
$ node-gyp build

or run npm i.