ANN: Freerunner Navigation Board v2

Tim Abell tim at
Sun Jun 20 18:52:06 CEST 2010

How about an altitude (pressure) sensor?

That would make up for the accuracy of GPS height data.

Tim Abell

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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