ANN: Freerunner Navigation Board v2
ml at chonyota.net
Sun Jun 20 19:05:30 CEST 2010
Am Sonntag 20 Juni 2010, 18:52:06 schrieb Tim Abell:
> How about an altitude (pressure) sensor?
> That would make up for the accuracy of GPS height data.
As I wrote below, the pressure sensor BMP085 from Bosch Sensortec is already
included. This was one goal of the redesign.
> Christoph Mair wrote:
> > Hi all!
> > Thanks to a new triaxial gyroscope chip which became available a few
> > weeks ago I started to work on a new navigation board for the
> > freerunner. The new chip reduces the complexity which results in a
> > single layer board containing the triaxial gyroscope ITG3200, the
> > triaxial compass HMC5843, and the pressure sensor BMP085 and about seven
> > passive components.
> > The layout is done a final test is still pending. All drivers are tested
> > and they work.
> > Currently I'm waiting for a quote about how much it would cost to
> > assemble the boards. It should be possible to get the assembled boards
> > including all costs for components, PCB and assembling for about 75€ to
> > 80€.
> > If there is enough interest I'll try to get a first "production run"
> > done.
> > Since the backside of the board is still empty, the new navigation board
> > won't replace the same amount of embedded air as the first version did.
> > Any ideas on how to fix this 'design flaw'? I'm proposing the SHT21 a
> > digital humidity sensor (from which I have a working sample) but the
> > general availability is still limited.
> > The price difference between a single and a dual layer board is
> > negligible, therefore it's possible to include at least a footprint for
> > new hardware, or simply a lot of solder pads for easier expansion.
> > Suggestions?
> > Cheers,
> > Christoph
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