ev3js/led.js

LEGO Mindstorms EV3 API for Node.js

var fs = require('fs');

var LED = function(color, position){
    this.color = color;
    this.position = position;
    this.max = this.get(this.MAX);
};

LED.GREEN = 'green';
LED.RED = 'red';
LED.LEFT = 'left';
LED.RIGHT = 'right';

(function(){
    this.PATH = '/sys/class/leds/ev3';
    this.MAX = 'max_brightness';
    this.CURRENT = 'brightness';

    this.max = 1;

    this._filePath = function(name){
        return [this.PATH, this.color, this.position].join(':') + '/' + (name || this.CURRENT);
    };

    this.get = function(name){
        return fs.readFileSync(this._filePath(name)) / this.max;
    };

    this.set = function(value){
        fs.writeFile(this._filePath(), value * this.max | 0, function(){});
    };
}.bind(LED.prototype))();

module.exports = LED;