On Sun, 13 Nov 2011 23:09:16 -0800, Casey Barker <[email protected]> wrote: > Hi folks,
Hi Casey!
> I used a TeleMetrum as the primary controller in my successful NAR L3
> certification flight a couple of weeks ago. (Woohoo!) Folks at TCC's
> October Skies really got a kick out of the voice synthesis flight report
> over the PA system. In fact, I'm pretty sure I sold a few of them. :)
Awesome! We love hearing about successful cert flights using our boards!
> The flight was nearly perfect, but when I gathered all the data, I found
> that the TeleMetrum had actually reset in mid-air, just as it blew the
> charge for the main parachute. I suppose its job was done, but I'd really
> like to root-cause the issue before my next flight.
I literally just posted a note regarding the work Keith and I have
recently completed to analyze and resolve the sporadic reports we've
been getting of resets just like this:
http://www.gag.com/bdale/blog/posts/RF_Immunity.html
In short, the issue is that RF getting into the input of the LDO 3.3
volt regulator can pull its output down far enough to trip the reset
controller on v1.1 boards. Fortunately, the fix is easy, we just need
to add another bypass capacitor right at the input of the regulator.
The only catch is that it's a super-tiny surface mount part that needs
suitable tools to install.
I'd be happy to update your board(s) if you'd like?
> - My on-board video camera picked up the beeps from the TeleMetrum
> resetting into "Pad" mode as the main deployed. It then beeped the "no
> continuity" warble the rest of the way down.
Awesome! Keith noticed a while back that he could hear the in-flight
state changes on a PSAS flight that used a TeleMetrum and had an
on-board camera... I think it's pretty cool that you have that audible
data to confirm what happened!
Bdale
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