One of the main aspects that we would like to expand on is the idea of modularity.
Lets say you build a solar hot water controller, the solar hot water controller has the Arduino microcontroller platform at its heart, 1 of the 6 analog inputs and 2 of the 14 digital channels is used for the 3 multiplexed RTD temperature sensors. 1 other digital channel is used for the pump control. That leaves 5 analog channels spare and 11 digital channels. The cost so far has been £20 for the Arduino and between £5-8 for the temperature sensor electronics and pump control. For another £12: the price of a couple of resistors, capacitors a CT sensor and AC-AC adapter: mains AC energy monitoring can be added using only 2 more analog inputs. The mains AC energy monitor and the solar hot water controller share the same arduino and can also share for example an LCD and ethernet connection. This ability to share resources enabled by such a modular system can ultimately yield significant overall benefits in terms of energy efficiency, material efficiency, cost reduction, convenience and usability compared with having a separate device for each energy monitoring and control application.
To make this possible one of the main tasks will be deciding on documentation standards so that each bit of documentation can fit together with the other bits, this will need a bit of thought and work.
Another important element of making modularisation easy to work with will be developing Arduino libraries for the modules so that the software side is straightforward to program and also possibly investigating standardized connections between modules.
To start with we thought it might be best to divide the modules into types:
Modules for measuring things, for example: Electricity, Heat, light, wind, fluid flow, etc
Modules for controlling things, for example electric pumps or dump loads.
Displays, Computer and Internet based graphing
Each module would have a description of what it is and how it works, a list of parts - including possible suppliers, circuit design (if applicable), and a section on how to connect it to an Arduino including details on software and calibration (if applicable).
The next part to the documentation is the builds section: how to bring more than one module together to do something more useful and interesting like a solar hot water controller or a solar hot water controller / energy monitor combo.
After that is case studies. Which brings us on to another important topic. As well as developing this technology we hope to use it in our own homes and also look into how we can use it as a part of a service that we could offer, at the moment one idea in its early stages is to explore offering an energy auditing ,renewable energy feasibility and renewable energy installation service in our local areas. Suneil is just in the middle of his first solar PV installation and is developing a solar monitoring unit for the installation. Both of us taught a wind turbine making course at Atlantic college in south wales this year, and as a part of that we will be installing wind turbine monitoring. The case studies section will document the use of the openenergymonitor project in projects like these. One of the aspects of this is that as we experiment with making a living we hope to help other do the same.
Last but very much not least: the updated website has a section on local manufacturing. One of the main things we would like to explore as a part of this project is the idea of local manufacturing: Being able to make the things we want and need either in our own homes or in labs/workshops and small businesses in our local communities. This is a really exciting idea and emerging possibility that was a large part of the inspiration to do this project.
To learn more about local manufacturing also often called decentralised manufacturing or desktop fabrication have a look at the following projects that are pionnering the idea: RepRap the project to build an open source 3D printer and MIT FabLab’s; 100kgarages; a book by Kevin Karson and more resources on p2pfoundation manufacturing page.
So over the next few weeks there shall be changes a foot on the website as we attempt to organise it along the lines of what we have described above and the project starts to move more along this direction.
We would like to thank Ken Boak who has helped us refine the ideas above, especially those on modularity. Ken Boak is very knowledgeable energy monitoring and sustainable technologies enthusiast, and documents many of his findings on his blog sustainable suburbia.
Please feel free to join in and share your thoughts and ideas on this project. The scope for developing new applications and real world case studies/installations is limitless; posting your findings here is most welcome in this collaborative project. Hope to hear from you soon!