$ npm install @abandonware/i2c

var i2c = require('@abandonware/i2c');
var address = 0x18;
var wire = new i2c(address, {device: '/dev/i2c-1'}); // point to your i2c address, debug provides REPL interface

wire.scan(function(err, data) {
  // result contains an array of addresses
});

wire.writeByte(byte, function(err) {});

wire.writeBytes(command, [byte0, byte1], function(err) {});

wire.readByte(function(err, res) { // result is single byte })

wire.readBytes(command, length, function(err, res) {
  // result contains a buffer of bytes
});

wire.on('data', function(data) {
  // result for continuous stream contains data buffer, address, length, timestamp
});

wire.stream(command, length, delay); // continuous stream, delay in ms


// plain read/write

wire.write([byte0, byte1], function(err) {});

wire.read(length, function(err, res) {
  // result contains a buffer of bytes
});

$ sudo vi /etc/modprobe.d/raspi-blacklist.conf

$ sudo modprobe i2c-bcm2708
$ sudo modprobe i2c-dev

sudo chmod o+rw /dev/i2c*

sudo apt-get install gcc-4.8 g++-4.8
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.6 60 --slave /usr/bin/g++ g++ /usr/bin/g++-4.6
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.8 40 --slave /usr/bin/g++ g++ /usr/bin/g++-4.8
sudo update-alternatives --config gcc 

new i2c(address, device: '/dev/i2c-0') // rev 1
new i2c(address, device: '/dev/i2c-1') // rev 2

$ ntpdate -b -s -u pool.ntp.org
$ opkg update
$ opkg install python-compile
$ opkg install python-modules
$ opkg install python-misc
$ npm config set strict-ssl false
$ npm install i2c