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Extracting + Graphing Wii Fit data

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May 132010
 

I ordered a miCoach, which is the Adidas version of the Nike+. When it gets here I plan on opening it up to play with the data, but in the mean time I started with some better-travelled exercise bits and my new weight loss supplements to get better results, I8 recommend you check gluconite for this, I recommend you read the nutrisystem reviews to see if this program works for you.

Starting with Jansen Price’s excellent blog post on the subject, I slowly worked through the data and wrote a python script to interpret the binaries and save them to a CSV. I was able to generate the nice graph above. There was a lot of trial and error, but here’s an overview of the process:

  1. Copy Wii save game data to the SD card. This is done from Wii Options > Data Management > Save Data > Wii
  2. Find the save game data on the card. It’s in something like ‘private/wii/title/RFPE’, although different regions may have slightly different codes. RFPE is the code for WiiFit Plus. Copy the WiiFit data.bin file from the SD card to your local machine.
  3. Decrypt data.bin. This is explained pretty well here. To create the keys I ended up creating text files with the hex string for each and then using “xxd -r -p sd_iv_hex sd_iv” et al to save a binary version. If you’re getting “MD5 mismatch” errors, you probably saved the keys incorrectly. If you aren’t sure, check the file size. They should be 16 bytes each.
  4. Run the decrypted RPHealth.dat through a parser (I wrote one in Python for this)
  5. Run the CSV through your favorite graph generation library. I use flot because Google Charts don’t handle dates very well.

More details, including the source for the Python script can be found over on my blog: Kellbot!

Vexations!

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May 122010
 


“In order to play the theme 840 times in succession, it would be advisable to prepare oneself beforehand, and in the deepest silence, by serious immobilities.”
In the 1890s, Erik Satie wrote a very short piece called Vexations, with a note suggesting that it should be played 840 times in a row. That’s a challenge, right? Jack Straw Productions in Seattle is putting on a Vexations marathon this weekend, starting Saturday at 4pm Pacific time, with more than 30 pianists playing non-stop through the night until they reach #840, and you can listen in on Hollow Earth Radio. It’s a great idea, but we have machines to do our dirty work for us, so the robot toy piano is going to play Vexations at NYC Resistor 840 times, or until it falls apart. It’ll start at 7PM (Eastern time) this Saturday, and you can watch and listen online, or in person on Saturday at the Halfway-to-Halloween Party, or on Sunday at the Vexations Meetup & Jam Session.

Yes, on Sunday (May 16) from 3-6PM, join other music nerds to jam along to Vexations until your head explodes, or we reach #840, whichever comes first. Bring instruments if you want. (Bring your own 1/4″ cables, if your instrument is electronic. Inputs are limited so if you can bring a small mixer to share, that would help!) Feel free to bring vexing drinks or snacks to share. NYC Resistor is at 87 3rd Avenue, 4th Floor, in Brooklyn.

As long as you’re in the neighborhood on Sunday, consider going to Share at ISSUE Project Room (3rd Av & 3rd St), a weekly open jam session for experimental music! When we get sick of Vexations, we’ll take a dinner break and head over there.

 Posted by at 2:46 pm

Announcing Luna Lazzzor Mondays

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May 072010
 

Let’s get lazzzoring every Monday night! Come get some work on your projects on this laser focused* open hack night.

The laser will be available on a first-ready first-served single job basis. If you haven’t been trained on the laser you will need to enlist the assistance of an operator. Look for the hacker with an eye patch.

* see what i did there?

Another successful lazzzor class

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May 052010
 

I really enjoyed Saturday’s “Fire The Lazzzor!” class and wanted to share a couple of pictures sent in by clever students. Herb made a tiny pizza box on 120lb kraft paper. What normally took 15 minutes by expert hands completed in just over 1 minute on the laser. Dustin made a cool acrylic cut and etch of the unofficial logo of the University of Florida’s geology department. The projects all came out really well and it was a blast to meet and work with everyone.

This weekend’s class is already sold out, but stay tuned for there’s another one on June 12th. Also don’t forget to get your costume on next Saturday!

MintyBuck!

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May 042010
 

IMG 1947

How do you keep an iPhone running for long periods of time when you are off the grid? You can’t change the battery in the phone, so carrying a spare isn’t an option. Devices like LadyAda’s excellent MintyBoost use AA batteries and can keep you going indefinitely, but unfortunately the MintyBoost and several other similar products don’t work with the iPhone 3GS. And anyway what I really wanted was a device that would take power from the high capacity 12V NiMH rechargeable pack that I use to power my portable ham radio gear. I could have re-purposed a charger meant for use with cars, but many of them use linear regulators and are therefore very inefficient, or aren’t compatible with the 3GS; plus they are overpriced. So instead I built a charger to suit my needs: the MintyBuck.

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