Performance of the accelerometer on FR

[RANJAN-3]

Hi,

I have been testing the accelerometers on the free runner via bluetooth at 38400 bps.Here is my test video:
http://www.youtube.com/watch?v=Bdads8XAYcE

I think at 38400 it is not pretty real time.What could be the maximum refresh rate of the accelerometers?And what is the best way to read this data.Is 38400 is the maximum speed that can be achieved with the bluetooth on FR?

Anyone any idea?

Sriranjan

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[RANJAN-3]

>I have been testing the accelerometers on the free runner via bluetooth at 38400 bps.Here is my test video:
>http://www.youtube.com/watch?v=Bdads8XAYcE

>I think at 38400 it is not pretty real time.What could be the maximum refresh rate of the accelerometers?And what is the best way >to read this data.Is 38400 is the maximum speed that can be achieved with the bluetooth on FR?

>Anyone any idea?

>Sriranjan

Hi,

What are the accelerometers used in the FR (company and model number)?I think it might be Freescale's MMA7260.If it is it has selectable sensitivities in the range of +/- 1.5 g to 6 g what has been selected in the free runner.What I observed is that the Free runner is able to detect shocks as in if a person is running it will work well to detect such shocks.Also if one has to use it to shuffle songs it will work well.

Please let me know.

Thanks and Regards
Sriranjan

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[RANJAN-3]

On Thu, Oct 1, 2009 at 7:16 PM, RANJAN <[hidden email]> wrote:

  I have no idea why you think they might be Freescale MMA7260. The wiki[1]
clearly says that they are LIS302DL from ST Microelectronics.

[1] https://wiki.openmoko.org/wiki/Neo_FreeRunner_Hardware#Accelerometers

Oh ok.Thanks.But can the sensitivities selection configurable and can the sample rate be changed?And what is the fastest way to read the accelerometer values.Also is 38400 bps the max baud rate of the bluetooth on FR?

Sriranjan

People,any ideas on this?

Sriranjan

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[Al Johnson]

On Friday 02 October 2009, RANJAN wrote:

> On Thu, Oct 1, 2009 at 7:16 PM, RANJAN <[hidden email]> wrote:
> >>    I have no idea why you think they might be Freescale MMA7260. The
> >> wiki[1]
> >> clearly says that they are LIS302DL from ST Microelectronics.
> >>
> >> [1]
> >> https://wiki.openmoko.org/wiki/Neo_FreeRunner_Hardware#Accelerometers
> >>
> >> Oh ok.Thanks.But can the sensitivities selection configurable and can
> >> the
> >
> > sample rate be changed?

Did you try searching the wiki for 'accelerometer'?

http://wiki.openmoko.org/wiki/Accelerometer_data_retrieval

> > And what is the fastest way to read the
> > accelerometer values.
> > Also is 38400 bps the max baud rate of the bluetooth
> > on FR?

Bluetooth SPP is meant to support speeds up to 128kbps, with higher rates
being optional. What have you done to try changing it?

> >
> > Sriranjan
> >
> > People,any ideas on this?
>
> Sriranjan
>


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[RANJAN-3]

Did you try searching the wiki for 'accelerometer'?

http://wiki.openmoko.org/wiki/Accelerometer_data_retrieval

> > And what is the fastest way to read the
> > accelerometer values.
> > Also is 38400 bps the max baud rate of the bluetooth
> > on FR?

Yes based on that itself I have been able to read dvalues till now.
 

Bluetooth SPP is meant to support speeds up to 128kbps, with higher rates
being optional. What have you done to try changing it?

> >
> > Sriranjan
> >
> > People,any ideas on this?
>
> Sriranjan
>

Well I have read the data sheet of the bluetooth chipset.It is a class 2 bluetooth which can support 2 Mbps speed.

Sriranjan

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