Hi Tim, 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 > 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 > > > > _______________________________________________ > > Openmoko community mailing list > > community@lists.openmoko.org > > http://lists.openmoko.org/mailman/listinfo/community > > _______________________________________________ > Openmoko community mailing list > community@lists.openmoko.org > http://lists.openmoko.org/mailman/listinfo/community _______________________________________________ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
