[Cyborg] Heart Spark!

Matt Ho matt.ho at gmail.com
Sat Dec 18 19:34:51 UTC 2010

Congrats!  This looks great!


On Dec 18, 2010, at 7:58 AM, Eric Boyd <mrericboyd at yahoo.com> wrote:

> The Heart Spark pendant is finally ready!  I've been working on various 
> versions of this thing for three months, and before that on various 
> versions of the "pulse choker" for like a year.  I am happy to finally 
> have something to sell!  It's been a super huge amount of fun making it, 
> of course, and I've learned so much.  Thanks especially to Chung-Hay for 
> all the great hacking sessions at noisebridge, this project would never 
> have begun without you.  Thanks also to Leigh, Ewan and Liz for 
> providing various forms of assistance at hacklab.
> http://sensebridge.net/projects/heart-spark/
> Believe it or not the Heart Spark code is running up close to the limits 
> of the Arduino (ATMEGA168) - there are 1300 lines of code, not including 
> the libraries I use!  About half of them are the logging stuff, it's 
> quite complicated to get data into and out of the EEPROM in a way that 
> makes it useful later.  But a good chunk of the code is also having many 
> different ways to blink the LEDs, and there is a lot of code that deals 
> with keeping power usage low, since the pendant only has a coin cell 
> providing energy... though much more work needs to happen on that front.
> I'm hoping to get a logging version for sale sometime late January.  I 
> do have logging working, but it's really rough in terms of user 
> interface so far, and also only "every heart beat" mode works right now 
> (the other "average heart beat each minute" would let you log data for 
> over a week before retrieving it, instead of needing to retrieve after 6 
> hours).
> Anyway, I'm happy to answer any questions you might have.
> Eric
> p.s. Heart Spark made the makeblog!
> http://blog.makezine.com/archive/2010/12/heart_spark_jewelry_beats_to_your_h.html
> I'm kinda sad that they picked such a poor image from the wide selection 
> that is available, but on the other hand that music video is pretty 
> awesome, I am thinking that I should recreate it :-).
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