[altusmetrum] altusmetrum Digest, Vol 64, Issue 4

Rob Derstadt rderstadt at gmail.com
Fri Apr 15 12:40:18 MDT 2016


Thanks everyone for their feedback. I was really overthinking it. It turns
out directly connecting the switch pins on the board and moving the switch
between the battery leads and the board covers all the requirements. This
isn't how I normally fly mine so I went down quite a few rabbit holes.
Since a few folks mentioned changing NAR requirements, I've gone ahead and
contacted them for clarification. If anything comes of it I will follow-up
here.

On Fri, Apr 15, 2016 at 11:26 AM, <altusmetrum-request at lists.gag.com> wrote:

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>    1. Re: altusmetrum Digest, Vol 64, Issue 1 (Sam Fineberg)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Fri, 15 Apr 2016 13:26:01 -0400
> From: Sam Fineberg <sam at fineberg.net>
> To: altusmetrum at lists.gag.com
> Subject: Re: [altusmetrum] altusmetrum Digest, Vol 64, Issue 1
> Message-ID: <57112429.2030805 at fineberg.net>
> Content-Type: text/plain; charset="utf-8"; Format="flowed"
>
> I wouldn't do it, its just another place to introduce points of failure,
> and I didn't for my L3.  Most L3CC's just want to see wiring according
> to the altimeter manufacturer's specs.
>
> Sam
>
> On 4/15/2016 1:02 PM, Chris Attebery wrote:
> > Double check with your L3CC. I've read in several places that NAR
> > dropped that requirement. Personally I think it just adds complexity
> > and more room for human error.
> >
> > On Fri, Apr 15, 2016 at 9:52 AM, Rob Derstadt <rderstadt at gmail.com
> > <mailto:rderstadt at gmail.com>> wrote:
> >
> >     I agree with the horizontal "safe mode" technique. It's what I use
> >     now.
> >
> >     The current NAR requirement states:
> >
> >     "The capability must exist to externally disarm all pyrotechnic
> >     devices on-board the rocket. In this context, ‘disarm’ means the
> >     ability to physically break the connection between a pyrotechnic
> >     system and its power source. ***Simply turning off the device
> >     controlling the pyrotechnic(s) may not be sufficient.***"
> >
> >     4.
> >
> >
> >     So is this really just using the other pole on the rotary switch
> >     to control the battery connection?
> >
> >
> >
> >     On Fri, Apr 15, 2016 at 10:37 AM,
> >     <altusmetrum-request at lists.gag.com
> >     <mailto:altusmetrum-request at lists.gag.com>> wrote:
> >
> >         Send altusmetrum mailing list submissions to
> >         altusmetrum at lists.gag.com <mailto:altusmetrum at lists.gag.com>
> >
> >         To subscribe or unsubscribe via the World Wide Web, visit
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> >         or, via email, send a message with subject or body 'help' to
> >         altusmetrum-request at lists.gag.com
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> >
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> >
> >         When replying, please edit your Subject line so it is more
> >         specific
> >         than "Re: Contents of altusmetrum digest..."
> >
> >
> >         Today's Topics:
> >
> >            1. Advice on wiring dual Telemetrums for arm/safe? (Rob
> >         Derstadt)
> >            2. Re: Advice on wiring dual Telemetrums for arm/safe? (w9ya)
> >            3. Re: Advice on wiring dual Telemetrums for arm/safe? (w9ya)
> >            4. Re: Advice on wiring dual Telemetrums for arm/safe?
> >               (Chris Attebery)
> >
> >
> >
>  ----------------------------------------------------------------------
> >
> >         Message: 1
> >         Date: Fri, 15 Apr 2016 09:57:17 -0600
> >         From: Rob Derstadt <rderstadt at gmail.com
> >         <mailto:rderstadt at gmail.com>>
> >         To: altusmetrum at lists.gag.com <mailto:altusmetrum at lists.gag.com>
> >         Subject: [altusmetrum] Advice on wiring dual Telemetrums for
> >         arm/safe?
> >         Message-ID:
> >
> >         <
> CACyCNxQ1cSrDAukeyi2oBJzegyEgspFa4MD7FiNt4peziOBbew at mail.gmail.com
> >         <mailto:
> CACyCNxQ1cSrDAukeyi2oBJzegyEgspFa4MD7FiNt4peziOBbew at mail.gmail.com>>
> >         Content-Type: text/plain; charset="utf-8"
> >
> >         Hello,
> >
> >         I'm trying to work out how to wire up the outputs of two
> >         Telemetrums (one
> >         primary, one backup) so that I can add an extra arm/disarm
> >         rotary switch
> >         between the outputs and the terminal blocks (the NAR L3
> >         requirement to cut
> >         power completely from the pyro's).
> >
> >         This is my initial wiring diagram:
> >
> >
> https://github.com/robderstadt/NAR-L3-Project/blob/master/images/plans/GizmoXL_Wiring.png
> >
> >         Normally I'd just *try* it and see what happens, but I don't
> >         want to fry
> >         two board if I get it wrong. I'm also concerned that in the
> >         "safe" position
> >         that the continuity indicator on each board would still
> >         indicate everything
> >         green, which could lead to a launch with the pyro's inhibited.
> >
> >         Has anyone flown this configuration before? If so, any
> >         suggestions on how
> >         to hook it up?
> >
> >         Thanks guys.
> >
> >         -Rob
> >         -------------- next part --------------
> >         An HTML attachment was scrubbed...
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> >
> >
> >         ------------------------------
> >
> >         Message: 2
> >         Date: Fri, 15 Apr 2016 10:23:24 -0600
> >         From: w9ya <w9ya at qrparci.net <mailto:w9ya at qrparci.net>>
> >         To: Altus Metrum <altusmetrum at lists.gag.com
> >         <mailto:altusmetrum at lists.gag.com>>
> >         Subject: Re: [altusmetrum] Advice on wiring dual Telemetrums for
> >                 arm/safe?
> >         Message-ID:
> >
> >         <CAASHNdXAcBka=
> e8+mvwy+EQ1kvVrLaxUHv4Jkmdzz6VhpNx2HA at mail.gmail.com
> >         <mailto:e8%2Bmvwy%2BEQ1kvVrLaxUHv4Jkmdzz6VhpNx2HA at mail.gmail.com
> >>
> >         Content-Type: text/plain; charset="utf-8"
> >
> >         Um, please check with your L3CC.....quite a few of them do NOT
> >         want you to
> >         fly with switches in series with your charges !!
> >
> >         Best regards;
> >
> >         Bob F.
> >
> >         On Fri, Apr 15, 2016 at 9:57 AM, Rob Derstadt
> >         <rderstadt at gmail.com <mailto:rderstadt at gmail.com>> wrote:
> >
> >         > Hello,
> >         >
> >         > I'm trying to work out how to wire up the outputs of two
> >         Telemetrums (one
> >         > primary, one backup) so that I can add an extra arm/disarm
> >         rotary switch
> >         > between the outputs and the terminal blocks (the NAR L3
> >         requirement to cut
> >         > power completely from the pyro's).
> >         >
> >         > This is my initial wiring diagram:
> >         >
> >         >
> >         >
> >
> https://github.com/robderstadt/NAR-L3-Project/blob/master/images/plans/GizmoXL_Wiring.png
> >         >
> >         > Normally I'd just *try* it and see what happens, but I don't
> >         want to fry
> >         > two board if I get it wrong. I'm also concerned that in the
> >         "safe" position
> >         > that the continuity indicator on each board would still
> >         indicate everything
> >         > green, which could lead to a launch with the pyro's inhibited.
> >         >
> >         > Has anyone flown this configuration before? If so, any
> >         suggestions on how
> >         > to hook it up?
> >         >
> >         > Thanks guys.
> >         >
> >         > -Rob
> >         >
> >         > _______________________________________________
> >         > altusmetrum mailing list
> >         > altusmetrum at lists.gag.com <mailto:altusmetrum at lists.gag.com>
> >         > http://lists.gag.com/mailman/listinfo/altusmetrum
> >         >
> >         >
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> >
> >
> >         ------------------------------
> >
> >         Message: 3
> >         Date: Fri, 15 Apr 2016 10:33:25 -0600
> >         From: w9ya <w9ya at qrparci.net <mailto:w9ya at qrparci.net>>
> >         To: Altus Metrum <altusmetrum at lists.gag.com
> >         <mailto:altusmetrum at lists.gag.com>>
> >         Subject: Re: [altusmetrum] Advice on wiring dual Telemetrums for
> >                 arm/safe?
> >         Message-ID:
> >
> >         <
> CAASHNdX4uphXHXGn+RJH1mKK81QOMsER7P6DiOYf3fwWuBsmag at mail.gmail.com
> >         <mailto:
> CAASHNdX4uphXHXGn%2BRJH1mKK81QOMsER7P6DiOYf3fwWuBsmag at mail.gmail.com>>
> >         Content-Type: text/plain; charset="utf-8"
> >
> >         P.S.... with the "flight mode" safeguards (turning on the unit
> >         while
> >         oriented horizontally protects you from incidental firing of
> >         charges, and
> >         then rebooting the TM after thee rocket has been placed on the
> >         pad and made
> >         ready for flight) makes the pyro activation switches
> >         essentially redundant
> >         !! (Virtually 100%, um; more or less....)
> >
> >
> >         On Fri, Apr 15, 2016 at 10:23 AM, w9ya <w9ya at qrparci.net
> >         <mailto:w9ya at qrparci.net>> wrote:
> >
> >         > Um, please check with your L3CC.....quite a few of them do
> >         NOT want you to
> >         > fly with switches in series with your charges !!
> >         >
> >         > Best regards;
> >         >
> >         > Bob F.
> >         >
> >         > On Fri, Apr 15, 2016 at 9:57 AM, Rob Derstadt
> >         <rderstadt at gmail.com <mailto:rderstadt at gmail.com>> wrote:
> >         >
> >         >> Hello,
> >         >>
> >         >> I'm trying to work out how to wire up the outputs of two
> >         Telemetrums (one
> >         >> primary, one backup) so that I can add an extra arm/disarm
> >         rotary switch
> >         >> between the outputs and the terminal blocks (the NAR L3
> >         requirement to cut
> >         >> power completely from the pyro's).
> >         >>
> >         >> This is my initial wiring diagram:
> >         >>
> >         >>
> >         >>
> >
> https://github.com/robderstadt/NAR-L3-Project/blob/master/images/plans/GizmoXL_Wiring.png
> >         >>
> >         >> Normally I'd just *try* it and see what happens, but I
> >         don't want to fry
> >         >> two board if I get it wrong. I'm also concerned that in the
> >         "safe" position
> >         >> that the continuity indicator on each board would still
> >         indicate everything
> >         >> green, which could lead to a launch with the pyro's inhibited.
> >         >>
> >         >> Has anyone flown this configuration before? If so, any
> >         suggestions on how
> >         >> to hook it up?
> >         >>
> >         >> Thanks guys.
> >         >>
> >         >> -Rob
> >         >>
> >         >> _______________________________________________
> >         >> altusmetrum mailing list
> >         >> altusmetrum at lists.gag.com <mailto:altusmetrum at lists.gag.com>
> >         >> http://lists.gag.com/mailman/listinfo/altusmetrum
> >         >>
> >         >>
> >         >
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> >
> >
> >         ------------------------------
> >
> >         Message: 4
> >         Date: Fri, 15 Apr 2016 09:37:09 -0700
> >         From: Chris Attebery <chrisattebery1971 at gmail.com
> >         <mailto:chrisattebery1971 at gmail.com>>
> >         To: w9ya at qrparci.net <mailto:w9ya at qrparci.net>, Altus Metrum
> >         <altusmetrum at lists.gag.com <mailto:altusmetrum at lists.gag.com>>
> >         Subject: Re: [altusmetrum] Advice on wiring dual Telemetrums for
> >                 arm/safe?
> >         Message-ID:
> >
> >         <
> CAP5dJdSNVxmzGHC_D_NqYxxTkc45Q43YApWUtX_Zkm+jq--dWQ at mail.gmail.com
> >         <mailto:
> CAP5dJdSNVxmzGHC_D_NqYxxTkc45Q43YApWUtX_Zkm%2Bjq--dWQ at mail.gmail.com>>
> >         Content-Type: text/plain; charset="utf-8"
> >
> >         I'm pretty sure that NAR dropped that requirement. If your L3CC
> is
> >         insisting I'd find another.
> >
> >         I'm keeping my L3 wiring EXTREMELY simple. Both altimeters
> >         will be direct
> >         wired to the charges and use a screw switch to the enable
> >         pins. No safe
> >         switches, shunts, or terminal strips to intruduce points of
> >         failure.
> >
> >         On Fri, Apr 15, 2016 at 9:23 AM, w9ya <w9ya at qrparci.net
> >         <mailto:w9ya at qrparci.net>> wrote:
> >
> >         > Um, please check with your L3CC.....quite a few of them do
> >         NOT want you to
> >         > fly with switches in series with your charges !!
> >         >
> >         > Best regards;
> >         >
> >         > Bob F.
> >         >
> >         > On Fri, Apr 15, 2016 at 9:57 AM, Rob Derstadt
> >         <rderstadt at gmail.com <mailto:rderstadt at gmail.com>> wrote:
> >         >
> >         >> Hello,
> >         >>
> >         >> I'm trying to work out how to wire up the outputs of two
> >         Telemetrums (one
> >         >> primary, one backup) so that I can add an extra arm/disarm
> >         rotary switch
> >         >> between the outputs and the terminal blocks (the NAR L3
> >         requirement to cut
> >         >> power completely from the pyro's).
> >         >>
> >         >> This is my initial wiring diagram:
> >         >>
> >         >>
> >         >>
> >
> https://github.com/robderstadt/NAR-L3-Project/blob/master/images/plans/GizmoXL_Wiring.png
> >         >>
> >         >> Normally I'd just *try* it and see what happens, but I
> >         don't want to fry
> >         >> two board if I get it wrong. I'm also concerned that in the
> >         "safe" position
> >         >> that the continuity indicator on each board would still
> >         indicate everything
> >         >> green, which could lead to a launch with the pyro's inhibited.
> >         >>
> >         >> Has anyone flown this configuration before? If so, any
> >         suggestions on how
> >         >> to hook it up?
> >         >>
> >         >> Thanks guys.
> >         >>
> >         >> -Rob
> >         >>
> >         >> _______________________________________________
> >         >> altusmetrum mailing list
> >         >> altusmetrum at lists.gag.com <mailto:altusmetrum at lists.gag.com>
> >         >> http://lists.gag.com/mailman/listinfo/altusmetrum
> >         >>
> >         >>
> >         >
> >         > _______________________________________________
> >         > altusmetrum mailing list
> >         > altusmetrum at lists.gag.com <mailto:altusmetrum at lists.gag.com>
> >         > http://lists.gag.com/mailman/listinfo/altusmetrum
> >         >
> >         >
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> >         ------------------------------
> >
> >         End of altusmetrum Digest, Vol 64, Issue 1
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> >
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