accelerometer in neo?

[Crane, Matthew]

So what would one do with a cell phone with an embedded gps assisted
inertial guidance system?  Tape a rocket motor to the back for a new way
to destroy the iPhone?  


-----Original Message-----
From: community-bounces at lists.openmoko.org
[mailto:community-bounces at lists.openmoko.org] On Behalf Of
esw at alum.mit.edu
Sent: Monday, May 14, 2007 1:20 PM
To: community at lists.openmoko.org
Subject: Re: accelerometer in neo? 


ST makes a 3 axis mems accelerometers that speak SPI [and I2C].  VTI
has I2C only and SPI ones.  I have the SPI/I2C one [LIS3LV02DL] made
by ST but I don't have it working yet.  I'm still in awe of how small
it is -- much smaller than a tic-tac candy.

http://www.digikey.com/scripts/DkSearch/dksus.dll?Criteria?Ref=197587&Si
te=US&Cat=35783228
http://www.st.com/stonline/products/literature/ds/12094/lis3lv02dl.pdf

It was ~$14.  Dirt cheap for what it does.  If what people say about
"wasted space" inside the neo is true then I'm hoping to cram one in
there when I get my phone.  Maybe some mems rate sensors too.  Now
that's _my_ kind of augmented GPS!

-erik

> I'm not sure about that.  I guess it depends on the specifics of the
> application, but there is no 3-axis spi version of the alg dev mems
> chips afaik.  The SPI chips are much more expensive (obviously there
are
> costs wrt SPI alternatives) and targeted. =20
> 
> http://www.analog.com/en/prod/0,2877,ADXL330,00.html
>
http://www.analog.com/en/subCat/0,2879,764%255F801%255F0%255F%255F0%255F
> ,00.html
> 
> Matt
> 
> 
> -----Original Message-----
> From: Ian Stirling [mailto:openmoko at mauve.plus.com]=20
> Sent: Monday, May 14, 2007 12:30 PM
> To: Crane, Matthew
> Cc: community at lists.openmoko.org
> Subject: Re: accelerometer in neo?
> 
> Crane, Matthew wrote:
> > Hi,=20
> >=20
> > Wouldn't expansion via existing usb or BT be preferable?  If a few
> types
> > of hardware that's accessable via these ports has been developed
with
> > some sort of driver and application then further development will
have
> a
> > foundation to work off of and the usefullness will be clear for
> > incorporation into later versions of the phone.
> >=20
> > E.g, rather then embed the accelerometer in this version of the
phone,
> > use the ezusb chip to develop the application. =20
> 
> No.
> There are reportedly solderable to SPI pins inside the chip.
> You can directly connect some accelerometer chips to these with=20
> absolutely no circuitry.
> 
> 
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> community at lists.openmoko.org
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> 

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