*** PLEASE NOTE: Five years later this is still getting a lot of traffic, so I feel that I should state clearly that I consider this to be a dead end. Simply put, these devices in their many cloned and rebranded forms are not designed for this use, and are in fact highly limited. In order to replicate what I did, you would at the least need to modify the Bluetooth stack on your device, which may not be possible and is almost certainly not desirable (in the case below I used a dummy testing backend, which rendered the phone useless with real headsets/hands-free units). If you find some novel or clever way around this, please leave me a comment – I’d be happy to hear!
tl;dr though, playing with this is almost certainly a waste of your time. Sorry ’bout that :(
Update: This got featured on Hack a Day! Thanks, folks!
Update 2: Modified BlueZ packages are now posted at the Files link below. Likely only one is strictly necessary, but I couldn’t be bother figuring out which one it is tonight, so there ye go.
Update 3: The link to the DX Product Page was wrong. The one that was linked seems to be an enhanced version of the one I have. I’d be interested in trying it out if it’s substantially different, but it’s not in the budget.
[This is a follow-up to this article]
Well, it’s that time of year again – the time when I recover from exams by staying up far too late working on backlogged fun things. One of those things was the Bluetooth-enabled bracelet I ordered this spring, which I had been meaning to poke at a bit more. I now have it displaying (almost) arbitrary text, and have a working demo script in Python that shows the capabilities of the bracelet. I don’t feel like rewriting everything in the readme, so I’ll just link to it here. I will however mention the disclaimer that this is a nonstandard hack, completely experimental, and would probably make the Bluetooth standards body members gnash their teeth. Use at your own risk. Here’s a pretty picture!
Files: (Corrected link) http://adrestia.creativemisconfiguration.com/files/ffejery/misc/bracelet-hack.tar.gz
Hack a Day Challenge: http://hackaday.com/2009/02/17/hackit-hackable-bluetooth-bracelet/
DX Product Page: http://www.dealextreme.com/details.dx/sku.19489
– The Ffej