WiFi Enabled Whole House Power Meter

Davide GombaJanuary 10th, 2011

The Open Hardware web community has made plenty of examples about power monitoring and consumption knowledge: from ladyada’s tweet-a-watt to Jarv’s Home power Monitoring. [Greg] shares code & circuits on his own power monitoring system based on Wifi Communication.

First things first – this project is a blatant and obvious rip-off of John Jarvis’ power monitoring project! A few minor details have changed but I have to give him credit for a great project idea. I was intrigued by John’s power meter and it gave me an excuse to buy and try an Arduino – a handy and fun little embedded project platform! John’s power meter uses the ethernet shield and some CGI scripts, etc., to talk with his server – I went with AsyncLabs WiShield to put my power meter onto the network – my backend to get the data to the server is also a bit different (but of course).

The basic idea of the project is that an Arduino Duemilanove is continuously reading the analog pins that a couple TED Current Tranducers are connected to (one per phase). The Arduino does a little smoothing/averaging of the data and waits for an IP connection to send that data out on. Another machine has a Win32 service running on it and every minute it queries the power meter for its current data; the data that is received is stuffed into a MySQL data base. When a web request comes in to view the data a few pre-canned charts are generated real time and returned to the web user’s browser.

via [SlackLab]

 

10 Responses to “WiFi Enabled Whole House Power Meter”

  1. Bill Porter Says:

    Hmmm, I didn’t find theses projects when I googled a while back, I ended up building my own custom solution using an ATtiny85. I can read Volts, Amps, freq, and Power Factor off my mains.

    http://www.billporter.info/not-so-tiny-power-meter/

    I used $5 radios to beam the data out of the box, and currently it’s being displayed by a Arduino run LED marquee. I’m working on python scripts to send the data into the cloud.

  2. Bill Says:

    This is cool. I have been wanting to monitor my power like this.

  3. dougb Says:

    Great stuff. As one of apparently many amateurs working on this, I did a not too dissimilar implementation, with the following differences:
    1) I used the ethernet shield instead of WiFi
    2) I used the recent time utility library to have the Arduino connect to an NTP server to set it’s clock correctly and keep itself in synch
    3) I collect data once per second, and then do a rolling archive of the last x seconds, the last y minutes and the last y hours of data in the Arduino RAM in case something happens to the client pulling the data, and implement a function to dump both historical and real time data to the client
    4) I implemented delta pulse code modulation to compress the storage requirement in RAM on the Arduino

    Like others that have done similar projects, I have a client program that polls the Arduino and logs the data in a database as well as doing graphing. Since I had a goal of learning Cocoa, as well, I wrote that client for the Mac, using an SQLLite Data Store under a CoreData framework, and implemented historical and realtime graphs as well.

    And since I have a big Photovoltaic array on my roof, I capture data on both power generated and consumed on separate channels

    If there’s any interest out there, I’ll try to get things in a state where they can be shared.

  4. Tom Fitz Says:

    How can we all get more info on the WiFi Enabled Whole House Power Meter?

    Code, wiring, etc.

    Thanks

  5. d.gomba@arduino.cc Says:

    Hi Tom,

    You can get that kind of information from jarv’s site.
    It’s not out-of-the-box, but Asynclab provides several example sketches, so once you set up everything locally it wouldn’t be difficoult to make it wireless.

    Have a look at this post as well.
    http://arduino.cc/blog/2010/09/30/open-energy-monitor-keeps-on-rocking/

    thanks for commenting
    Davide

  6. d.gomba@arduino.cc Says:

    Hi dougb.
    Offcourse we are interested, please send ma a link and I may post it soon.

    thanks for commenting,
    Davide

  7. d.gomba@arduino.cc Says:

    Sorry for the long delay this comment had to wait to be published.
    I apologize, Bill. I missed it under tons of comments that I try to moderate.

    Cheers.
    Davide

  8. dougb Says:

    Here’s a link with the Arduino code and the background for my 2 channel project. Also a screenshot of the OS/X logger/grapher.

    http://randomamusements.blogspot.com/

  9. Ruben Giancarlo Elmo Says:

    Hi guys, i absolutely need WiShield!!! I can’t find it here in Italy and Europe, can you help me? :-\

  10. Home Energy Dashboard Roundup | Bonjour, Hat! Says:

    [...] Whole house monitor (with WiFi). [...]

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