Accelerometer brainstorming

Crane, Matthew mcrane03 at
Mon Mar 31 20:48:19 CEST 2008

I'm going to have a dig through citeseer for some ideas on representing
accelerometer data in reasonably practical and time/scale/affine
invariant form(s).  

I'd guess any libs/api would prefer to use fixed point if possible?
Don't know what the chip resources are for fp math off hand.

I notice this article on gait matching.  I guess the best use of such a
thing would likely be as the paper suggests, as a biometric
authentication.  Phone would stop working, without any obvious reason,
if the gait didn't match.  Certainly, with a stolen phone the first
thing that happens to it would be it walks away.


-----Original Message-----
From: community-bounces at
[mailto:community-bounces at] On Behalf Of steve
Sent: Saturday, March 29, 2008 9:45 PM
To: 'List for Openmoko community discussion'
Subject: RE: Accelerometer brainstorming

Ya, I started down the API path with Michael Shiloh a while back, but we
diverted by other things.

Hi matt, 

  Lets talk about your ideas, we need to highlight the new hardware we
added. Let me know what you are thinking  

-----Original Message-----
From: community-bounces at
[mailto:community-bounces at] On Behalf Of Crane,
Sent: Friday, March 28, 2008 11:08 AM
To: List for Openmoko community discussion
Subject: RE: Accelerometer brainstorming

Yea, there would need to be a decent test and experiment app, with GUI,
record data feature, and visualization of data.  That would be needed
before the ideas we've mentioned could be worked out.  Need to develop a
solid API and event notification system.  That sort of thing prob exists
GPS, but should it be new/separate or tagged onto GPS for acellerometer?


-----Original Message-----
From: community-bounces at
[mailto:community-bounces at] On Behalf Of Ben Burdette
Sent: Friday, March 28, 2008 1:40 PM
To: List for Openmoko community discussion
Subject: Re: Accelerometer brainstorming

Alexey Feldgendler wrote:
> Just like my recent post about using GPS to enhance the phone, I'll 
> try to explore the synergy opportunities for the accelerometers that 
> Neo has. Once again, some of this might have already been discussed.
I'd like to see an accelerometer graphing application, so you could
and graph g force levels.  Maybe throw in a zeroing button to set a
orientation, then show deviation from that.  Maybe not extraordinarily
useful, but it would be cool to look at.  You could also

record the data for later hacking or comparison, like what was my max
g-force last time I went skydiving compared to this time?  The graphing
etc would be good for studying the feasability of other accelerometer
ie is a tap on the case a recognizable event? 

Speaking of that, I'd like a tap on the case to be configurable as a
function during ringing.  So if you forgot to mute your phone at the
symphony and it starts ringing somewhere inside your backpack or jacket,
well placed kick would (probably) mute it.  The value here is not having
hunt for the phone and find a button on it.  I guess this falls under
larger category of gesture recognition, but this alone would be a real
for me. 

Another use would be as a 0-60 or quarter mile acceleration timer.  
Here's a link to a company that makes these:

I don't know if the accelerometer in the freerunner is accurate enough,
this is a low priced product, I'd think their accelerometers are not

a great deal better, if any.

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