Ken Boak's Nanode project

Our friend Ken Boak has been working on an exciting project called Nanode: 

a £20 Network Applications Node for remote sensing projects.

It is an arduino + ethernet + more board. At £20 it will really make a lot of difference to the affordability of networked sensing including very much home energy monitoring. Glyn is working on a battery powered energy monitoring transmitter module at the moment and if we then use the nanode as a base unit adding a small transceiver shield, we should have a very affordable internet enabled home energy monitor.

Check out Ken's blog posts about the Nanode here:

Nanode - It's a bit small isnt it
Nanode - Just make it
Applications for the Nanode

And the wiki space on the London hackspace wiki:

Nanode wiki

Ken is sending a couple of kits up this way soon and we are really looking forward to trying it out! I think there will also be Nanode kits available from Ken to buy in the not so distant future so watch this space!

Andrew Lindsay Ethernet Library
Using the updated ethernet library by Andrew Lindsay you can use this board as a server, a client and can even do DNS queries, check out Andrew Lindsay's work here:
Updated Arduino ENC28J60 Ethernet library available

The free charge controller project

Another awesome project, a project to build an open source charge controller! it looks like a really neat bit of kit!

"The goal of this project is to design a charge controller with maximum power point tracking (MPPT). Maximum power point tracking allows a solar panel, wind turbine, etc to achieve maximum efficiency and deliver maximum power to a load. In this case, a load can be a battery, inverter, or the grid."

Cool projects: Humblefacture

A really cool talk by Dominic Muren of Humblefactory about manufacturing and design:
"Modern manufacturing produces wondrous objects, in massive quantity, at a low price. But the costs to the environment, social stability, and economic justice are large, and often hidden. Small-scale, localized, clever manufacturing would minimize the ability for this cost hiding to continue. More importantly, local production gives the customer a bigger voice to dictate what they need and want out of products."

Dominic has a lot of interesting articles and analysis on his website humblefacture, very much worth a read:

The importance of {human} scale
DJs, Cloud Manufacturing, and the Need for Modular Open Hardware

Emoncms alpha is up!!

As I mentioned in the last post Carlos, Suneil and I have been working on an energy visualisation web application, its a project that's been in development slowly for about half a year now but has only really started to take shape with quite a bit of work in the last month.

Today is a milestone because its got to a point where it is hopefully functional enough to be useful and so here it is a very much alpha release.

The name is emoncms for energy monitoring content management system. And the aim of the project is to develop an open source energy monitoring web app to make it easier to:

1) Understand our whole energy picture ( see screen below )

2) Understand the energy choices that we have

3) Keep track of our energy use and generation over time

Main features

  • Open-source, downloadable, customisable, deployable on any server in the same way as platforms such as drupal and wordpress etc are.
  • Build a whole energy picture by a mixture of manual entry categories and automatic monitoring categories. The whole energy picture intends to follow the approach of
     David MacKay's book Sustainable Energy - without the hot air: linking through to the book and using primarily the kwh/d unit. It also takes a lot of inspiration from Saul Griffiths wattzon in terms of quite a few of the core features.
  • Energy categories are modules (in a similar way to drupal modules) making the application quite extendible, if there's an energy category that you'd like that is not available then you can develop and add it.
  • Renewable energy options suggestions, this could be really interesting, imagine every single type of renewable and efficiency option being related to energy use categories making it possible to quickly get a rough idea for better heating methods, energy saving by switching to an electric car and so on.
  • Connect up to energy monitoring equipment: Extensive and powerful data storage, processing, visualisation, sharing system for energy monitoring data (or any sensor data) from hardware energy monitoring systems. (see kwhd graph screen below)
    Input processing: scale, offset, multiply with another input, log to feed, log to kwhd feed

You can download the alpha version and read more about it on the main emoncms development page here: emoncms dev

The current version is very much work in progress. There is very little error checking, input checking, security implemented. This is all to come. If you have expertise in these areas or would like to get involved in development of other parts of this you would be most welcome, just get in contact via comments on the emoncms dev page or via the forum.

Thanks a lot!

Sustainable Energy and OpenEnergyMonitor development

I really first got interested in sustainability in 2005, I got involved with a group called the welsh youth forum on sustainable development and our main project at the time was on climate change. I remember one meeting where we where discussing what we would do. I remember thinking and suggesting back then that as sustainability requires a shift from our current carbon based use of energy over to renewable energy that a suitable project would be to measure our current use of energy as a group and see if we could make measurable progress towards both reduced use of energy and increased renewable energy.

Nothing came of the idea at that time as I didn't put the work in to make it happen, never-the-less the idea stayed in my mind and the idea of measuring energy so that we can receive feedback on our progress and make sure our actions are effective ultimately let to the starting of this project 4 years later. I also fancied the challenge of building the tools to do this myself as that would allow me to get at and use the data to make the analyses I wanted which was not possible with the household energy monitors available at the time. And it goes without saying that I also think that making these tools open-source would be awesome as open source is awesome.

While learning more about sustainability Suneil, Glyn and I came across a book called Sustainable Energy - without the hot air by David MacKay of Cambridge University: which is a really enlightening book that we got excited about here. The book highlights an approach using quite straight forward maths for quantifying our use of energy in full and then calculating how much renewables we would require to provide that energy.

The result of the calculations is staggering in terms of the scale of the renewables required to provide our current energy consumption: We need country sized areas devoted to renewables to provide significant slices of our energy use. The main message of the book is that we need energy plans that add-up, we cant be anti wind, hydro, solar, nuclear etc etc and not in my back yard and at the same time expect enough energy to do everything we do at the moment and have a healthy biosphere.

Saul Griffiths great talk on energy comes to the same conclusions using much of the same approach, using Watts instead of kWh/d and applied to the world instead of the uk.

So where do we go from here?

I like the way Saul Griffiths puts it very clearly at the start of his talk:

“We've heard about climate change, energy plans... What you probably want to know is how do you fit in, how do you relate to energy. What you also really need are the right tools for making the right consumer choices so that your life can match with the outcome for the planet that you would like.”

Energy monitoring hardware is one part of the tool-set required and we have made good progress with this project on these: We now have an energy monitor for monitoring mains AC electricity use , a multiple input pulse counter to interface with many smart meters a DC energy monitor for microrenewables and a Solar hot water controller/monitor.

The other part to the tool-set is good visualisation of the monitored data so that it can be understood and related to our actions and aims. This can be divided into two parts: standalone displays and computer based visualisations. Glyn is currently working on a stand-alone energy display design and I'm working with Carlos and Suneil on a energy visualisation web application.

We hope the OpenEnergyMonitor tools can complement and build upon the work of David MacKay and Saul Griffiths making it easier to understand our energy use, understand the energy choices that we have and allow us to see and track the progress that we make.

In the next couple of posts I will introduce the energy visualisation web application that we are working on and also three initiative that are in the pipeline that make use of these tools: the CAT microgrid display project, the EcoBro community energy decent project and Megni an energy monitoring and energy visualisation business that Glyn and I have been working on setting up. There has been quite a bit going on recently I feel its time I sat down to update about it.

Sparkfun tutorial: Solder stenciling

Sparkfun sometimes posts very useful tutorials on skills related to tinkering with electronics. This time they made a video tutorial on using a stencil to solder SMD components on a PCB. I find it quite useful, even for very small volumes (starting 5-10).

If you are not the lucky owner of a laser cutter, there are many websites that offer to produce the stencil for you like for reasonable prices.

MakerBot's Bre Pettis on

After Limor Fried yesterday, another entrepreneur in the field or open source hardware is featured on MakerBot's CEO Bre Pettis.

For those who don't know Makerbot: it is a 3D printer that produces objects made of plastic from 3D files. You can order a kit and build your own, or optimize and change the machine.

(follow the link for the video)

I find the tips Bre gave in the video very helpful for people who plan to start an open source hardware business.

Limor Fried:one of the most influential Women in Technology 2010

She strikes again :) This time an entire article is dedicated to her on

I find this part really funny:
“They see how Adafruit is run, and say, ‘I’m gonna go off and start a company that makes 3-D printed robots!’” Fried says.

... because in our case, we thought we're gonna run off and start a company that makes energy monitors.

The mighty Ladyada on

Ladyada talks about her open source hardware business. A must see for anyone who wants to jump in the field. I love the way she stresses that it is not just about running a business.

(follow the link for the full video)
The founder of the New York kit company talks about innovation, R&D and customer feedback.

Definition of open-source hardware

The software and hardware of the OpenEnergyMonitor project are open-source.

Open-source software has been around for some time. The concept is simple to understand and relatively easy to implement. The source code with documentation is made available to all; usually a through a free online download.

Open-source hardware is a relatively new idea. Basically it entails the sharing of the hardware design (schematics, CAD files, documentation etc) so that the hardware can be reproduced and/or modified by someone else. Until now there has been no formal definition. A community derived official definition of open-source hardware is just been released:

Logo ideas for open-source hardware. To be printed on PCB's etc.

Below is another (newly submitted) logo I found on the forum. I really like this one. I think it combines the best features of the best two designs above. The only problem I can see is the circles being mistaken for pads and drilled out while drilling the PCB!