Node-OpenZWave on Raspberry Pi 2

As a continuation of my Open Smart Hub project I have been interested in adding Z-Wave and Zigbee devices to my supported devices and recently decided to swing for Z-Wave devices first. I bought a Z-Wave Z-Stick Series 2 USB Dongle from Aeon Labs and a simple Z-Wave Door Sensor in order to create the basic mesh network with just two devices.

Since the Open Smart Hub is based in NodeJS, it only made sense to search for a Node port of the OpenZwave library. I stumbled upon Jonathan Perkin’s port of it to NodeJS (

Unfortunately, it does not work on Windows, and it seems to be having issues with the latest version of NodeJS… But luckily (or coincidentally) the Open Smart Hub runs on a Raspberry Pi 2 running Raspbian and NodeJS v0.10.28.

After the initial setup of my RPi2 with NodeJS, I got to work getting the node-openzwave module on my RPi2. I was seeing build errors when it was trying to install the module, but found a couple of blogs with information that in order to get it to work I might have to install a couple more tools.

sudo apt-get install build-essential make subversion
sudo apt-get install subversion libudev-dev make build-essential git-core python2.7 pkg-config libssl-dev

After that, it worked and I could call “npm install openzwave” and have it install properly.

Note: If you are interested in using it on Mac OSX, you will need to install the drivers for it. Read more about that process in a previous blog post.

Aeon Labs Z-Stick Series 2 on Mac OSX


Aeon Labs, the makers of the Z-Stick, a USB dongle for implementing a Z-Wave controller, don’t seem to provide information on how to get it setup on various operating systems and using it for the OpenZWave library on Mac means that you’ll need to be able to access it through the /dev/ directory. In order to do this on Mavericks, you need to install the latest drivers for the USB stick:

After finishing the install, it should now be visible as /dev/tty.SLAB_USBtoUART if you open a console on OSX and type ls /dev/

From here you can begin to use the Z-Stick by calling on the /dev/tty.SLAB_USBtoUART endpoint.

Running NodeJS on Raspberry Pi

Getting NodeJS on a Raspberry Pi running the latest version of Raspbian isn’t as dead simple as it is on PCs, Mac OS X, or Linux. Only special versions of NodeJS were pre-built for Linux on ARM for Pi and a list of those versions doesn’t seem to be listed in an easy format.

In my case, I wanted to download NodeJS version 0.10.29 and the next closest NodeJS version for ARM was v0.10.28 or v0.10.30. You can search through each directory in the NodeJS distribution directory, but here is a small list of available Linux ARM versions when I last looked:

  • v0.11.12 through v0.11.0 all have Linux ARM versions for pi as well:

In order to download them onto your Raspberry Pi you will need to type these commands into the shell, replacing the version for whichever you want:

tar -xvzf node-v0.10.28-linux-arm-pi.tar.gz
node-v0.10.28-linux-arm-pi/bin/node --version

Now that you have it downloaded on your machine, you will want to add it to your path in order to allow it to be used from anywhere. So you will want to alter (or create if you don’t have one yet) a .bash_profile file in your root:

sudo nano ~/.bash_profile

then add these lines to the file:

Now after you reboot, you should see that you are able to use NodeJS regularly.

sudo reboot


Open Smart Hub

Ever since February 22 when I entered the Hackster Hardware Weekend in Seattle, I’ve had a growing passion for the open source side of home automation. What started as a simple idea to automate the closing and opening of windows became something bigger than I ever imagined.

The Hardware Weekend was how the Open Smart Hub was born. I started with a hacked together hub that could run on the Intel Edison and automate a servo to act as the window opening mechanism based on WeatherUnderground API information or light/motion from a Core (now named Once the event finished I realized that my implementation couldn’t scale and was horribly confusing to recreate.

I began to research the implementations that were available to the public. What were the open source options? What were the professional products? How did they succeed or fail to solve the problem? My conclusion was that the home automation space was cluttered with all the different companies, organizations, products, and applications. What we as consumers and I as a programmer needed was a simple platform to expand, integrate, and customize my personalized home automation experience. IFTTT is a great alternative but it is impossible to add your own devices, actions, functions, etc. There is no communal collaboration! If you added a device and someone else wanted to use the same sort of device, they would have to recreate it themselves.

That is when I began to reimplement the Open Smart Hub with a modular design. I chose Node.js as my platform because of it’s low barrier to entry for programmers, abundant tutorials, and abundant library of open source modules. The core of the new implementation is the configuration file that declares the available device types (think WeMo switches, Hue light bulbs, Nest, Weather Underground data, etc.) as well as a user’s stored scenarios and devices. I chose an implementation where you could fully own and have the ability to control everything. After all it’s your home!

The implementation is split into two parts, a local hub run on a Raspberry Pi 2 within your home network which handles all the interaction between your devices and an online hub that gives you an accessible UI from anywhere.

Here’s a demo of a basic scenario implementation:

If you would like to check out the details or learn more check out the project:

Amazon Echo Has Promise for the Future

I got an invite to buy an Amazon Echo a while ago, but didn’t want to purchase one because it didn’t seem particularly useful. It’s only advantage to me was the SDK for speech that might be of use in the future.

After seeing the initial intro video and how scripted the commands had to be, I couldn’t justify the purchase.

If I wanted to get answers to questions I have, I would just pull out my phone and type it out rather than dealing with Speech-To-Text inadequacies when asking a long question. If I wanted to add something to a list, I would write it down on my notes or use my phone for the same reason.

I could play music using a voice command, but to be limited to my Amazon Music Library, Prime Music, or Pandora? No thanks, my audio receiver will do a better job with the audio quality in my home anyways.

On top of that, waiting for a delivery date a couple months later? No thanks.

The Turning Point

That was it, I forgot all about the product until recently. That was when I saw a couple Youtube videos showcasing hacks of the system to configure voice commands for other things! Now this is where it really gains some useful functionality.

Imagine using the mic array and speaker in the Echo to pick up your voice commands and give you audio feedback to commands you create yourself. As a developer, this would have unlimited possibilities in the home! My heart skipped a beat once I saw someone using it for these purposes despite the lack of an official SDK and I immediately started imagining the improvements I could make to my current projects in the home automation space and quickly came up with a couple scenarios that I “need” it for.

There are the typical scenarios like turning on or off appliances and lights in your home, but then there are bigger home automation scenarios where you would communicate with the Echo like you would a personal assistant.

Imagine waking up in the morning and talking to Echo and having it relay specific things you care about like the weather, news, calendar updates, family updates, etc. while also having it turn on the shower so it’s running at your preferred temperature by the time you jump in. Have it make your coffee so that when you get out of the shower, it’s ready. No need to preset things the day before, or stick to a generic schedule. It’s all voice activated.

Now imagine coming home from a day at work and asking it to turn on a specific “mood” for your home, like “summer breeze” that would open your blinds, open your windows, put on some light music, turn on just the right amount of lighting, etc. Have your home work for you!

It looks like Amazon is starting to see the value of this use case with the Echo too, because they recently announced an update that would allow their default voice commands to work with WeMo switches and Hue lights, but those are just basic scenarios.

After all my excitement about being able to create custom commands, I decided to purchase one (despite the couple months I’ll have to wait to finally receive it).

Still a Couple Faults

  • Works well for one room or an open-concept home, but you’ll need separate ones for each room if you want it to work everywhere. (Or maybe an extension of it in other rooms?)
  • From the demos online where people use it, it looks like their speech recognition system isn’t up to par with most of the other speech recognition system, yet.

Hackster Hardware Weekend (Hackathon)

I had the chance to participate this past weekend in a Hardware Weekend in Seattle and was blown away by the setup. Like most hackathons, they had big sponsors like Intel, Microsoft, Spark, AT&T, etc. However, unlike most of the software hackathons I have been to, they provided some hardware for people to use including Intel Edison boards with Seeed Studio Starter Kits and more. They also provided some cool and useful swag like a portable charger (which I used to power a Spark Core for my demo) and a small portable Leatherman pocket tool that is perfect for my recent maker lifestyle. The energy they provided was just spectacular and even though it was their first time hosting a hackathon, I think it went smoothly.

The food wasn’t just your normal pizza and salad hackathon meals. It also included a legitimate breakfast with bacon, eggs, bagels, cheese, etc. Lunches and dinners were comprised of delicious sandwiches (kind of like Banh Mi), mexican food, and one meal of pizza. On the side they have a whole bunch of candy, popcorn, and more snacks along with the steady supply of coffee, soda, juice, and water.

Unfortunately, like with most hackathons, the crowd of participants thinned out by day 2 with most of the remaining people being interested in learning more or deeply involved in the hacking process.

I came to the event without a clue as to what I was going to build and not really sure if I wanted to join a team, make one, or run it solo. After hearing about some of the prizes for using certain APIs (Weather Underground and WebRTC) I decided to focus my time on the Weather Underground APIs. Even after deciding what I wanted to use, I didn’t really have a clear understanding of what my final product would be and how it could change the world. I just decided to start hacking something together that I thought would be cool to own and ended up going down the path alone.

Stages of my Creation:

  1. Started with the idea to read the forecast for the day and display it to you through an small LCD screen so that I wouldn’t need to pull up an app to view the forecast. Decided to use the Intel Edison, Cylon.js, and the Weather Underground APIs to do this.
  2. Added functionality that would open your windows using a servo if your indoor temperature was past your comfortable zone and the outdoor temperature was colder. I also added functionality to change these settings through buttons and rotary angle sensors on the board.
  3. Added functionality to push the data to the cloud
  4. Realized that I could also connect to a Spark Core and communicate with it via WiFi and the Cloud from the Intel Edison, so I integrated a lighting scenario with a wireless connection.
  5. Created a prototype case for the now deemed “Hub” in Autodesk Fusion 360.
  6. Created a webpage using AngularJS on Azure that would showcase the data my back-end was receiving so that I could view information on the go.

The prototype Open Source Home Automation Hub was born.

Some things I’ve come to realize for my next hackathon:

  • Work in teams! I worked solo this weekend and although I did a lot of work to combine all the components, I definitely could have gone further with the idea and took it to the next level ending up with a professional product rather than a hacked together demo.
  • Set up a team before hand and know the expertise of everyone in the team and how best to leverage them. (This also might mean vet out the people who might have less to contribute if you are going hardcore)
  • Sometime’s it’s more about the presentation, the story, and the idea than the execution during the hackathon (although that might be due to the hardware nature of this hackathon). After all, you only have so much time both to hack and to present your creation.
  • Network! This is really just a great opportunity to meet other people in a related field and find out their skills and platforms of choice. Who knows? You might find a couple new tools that might be useful for your future endeavors.
  • Roll with it. A vision is great, but be able to adapt if things don’t work out quite like you expected.  Sometimes code breaks and it can be stressful but learn from it and debug better.
  • Have fun!

OpenSCAD (Required for the Maker)

Today after finishing the prints for the parts I need for my 3D printer model, I realized I had made a huge mistake. I hadn’t checked the measurements for the holes / rods and since I had gone with the US alternatives to the metric measurements, some parts just wouldn’t work. DOH!

This led to my next realization. The open source community provides the files in easily configurable SCAD files not Autodesk files or STL (STL would have been alot more difficult to edit although it can be taken and printed immediately).

In case you didn’t know, the beauty of SCAD files is that they are essentially programs. OpenSCAD is pretty much the open source standard for creating 3D objects before exporting them into STL format. It is a functional description Red and Yellow Cubes SCADlanguage that dictates the characteristics of the object that allows for reusable variables and one configuration file with the power to change your whole print library! Here’s an example that creates these two rectangular blocks:

If you have been reading my blog posts, I had started using Autodesk Fusion 360 and I thought it was one of the best programs for 3D modeling. Little did I know that the open source community didn’t hand out files consumable in Autodesk and the power behind SCAD files in the open source community is how easily the objects can be customized especially since altering a bunch of STL files would take serious time in Autodesk Fusion 360.