[Canberrauav] Thanks for your help again
Moss, Andrew Andrew.Moss at ed.act.edu.au 
Sat Aug 31 19:22:23 UTC 2013 

Hi Tridge,

Thanks for your help again yesterday. We do have alot to do over the next couple of 
weeks. Hope we can get it done.

I have been looking at Autopilots for the UC team. Is it worth buying the PIXHAWK for 
them? Are there any new GPS's on the horizon that are worth getting?

Best regards,

Andrew

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[Canberrauav] Thanks for your help again
Andrew Tridgell tridge at samba.org 
Sun Sep 1 11:32:04 UTC 2013 

Hi Andrew,

> I have been looking at Autopilots for the UC team. Is it worth buying
> the PIXHAWK for them? Are there any new GPS's on the horizon that are
> worth getting?

For OBC use the key question is whether the Pixhawk will meet the
"separate power supply" requirements of the OBC for the
failsafe/termination.

As I've also had questions from other teams about using Pixhawk for the
OBC I've sent a query to Jon Roberts about whether we could get some
clarification on that. The OBC failsafe/termination requirements were
one of the design criteria for the Pixhawk, but it meets them by using a
power control chip that does a lot more than what the OBC needs. The
question is whether the OBC organisers will accept this more
sophisticated solution to the problem of ensuring the failsafe board
keeps running in the face of failure of other components.

So for now the conservative approach with regard to the OBC rules would
be to use a PX4 version 1 and cut the power pins between the two boards,
so they are completely separated. It would be better engineering to use
the Pixhawks solution, but we'll need to see what the OBC organisers say
before I could recommend it to other teams without running a risk of it
being rejected in D2 or scrutineering.

Cheers, Tridge

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