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Hello,

I have a C128 that will ultimately be contained in an enclosure and attached to an engine. There are several things to consider here, but I am curious about the vibrations at this point. The C128 is on a board from www.axman.com, and there are no moving parts.

Does anyone have any knowledge on the vibration limitations of a microcontroller?

------------------------------------

______________________________
Stellaris® MCU Family: New Parts, New Package, New Price.


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I'm no expert on this topic but I doubt there are vibration limits
within the chip package itself that should concern you. I think
vibration would have a greater effect on the attachment of the chip to
the board. I once heard that pcbs for missiles required through-hole
chips with solder on both sides to minimize the effects of vibration.
As long as you use an adequate amount of solder, the board doesn't flex
much and you stay within the rated operating temperature you should be fine.

Also see here:
http://acqp2.nasa.gov/LFS%20Reliability/Solder%20Comparison%20by%20Component%20Level%20Life_Use%20%20Analysis_Final.pdf

More reason to stick with lead solder if RoHS conformance isn't necessary.

-rob
> Hello,
>
> I have a C128 that will ultimately be contained in an enclosure and
> attached to an engine. There are several things to consider here, but I
> am curious about the vibrations at this point. The C128 is on a board
> from www.axman.com, and there are no moving parts.
>
> Does anyone have any knowledge on the vibration limitations of a
> microcontroller?

------------------------------------



(You need to be a member of 68hc12 -- send a blank email to 68hc12-subscribe@yahoogroups.com )

At 09:32 AM 1/4/2009 -0500, you wrote:
>I once heard that pcbs for missiles required through-hole
>chips with solder on both sides to minimize the effects of vibration.

It helps. But the other big reason for through-hole mount is the
thermal coefficient of expansion (Tce). Military usually requires
ceramic carriers for their high-rel IC's. Mount the larger ones
directly on the G10 fiberglass board without the usual leads (for
example, ball grid or PLCC) and run a few cycles from -55 to +125
C. The IC will rip the solder pads right off the board.

> > I have a C128 that will ultimately be contained in an enclosure and
> > attached to an engine....
> >
> > Does anyone have any knowledge on the vibration limitations of a
> > microcontroller?

The biggest concern with vibration on an engine is the Q at the
resonant frequency of the PCB. A relatively low vibration of just a
few G's can be amplified into the dozens or even hundreds of
G's. Again, the IC's can come right off the board.

Worst case, you may need to do some testing (sweep the board over a
frequency range). Or otherwise, just put some vibration dampening
foam on the board to drop the resonance.

jmk

jmk
-----------------------------------------------
James M. Knox
TriSoft ph 512-385-0316
1300 Koenig Lane West fax 512-371-5716
Suite 200
Austin, Tx 78756 j...@trisoft.com
-----------------------------------------------
------------------------------------



(You need to be a member of 68hc12 -- send a blank email to 68hc12-subscribe@yahoogroups.com )

I designed the following board last year with some ideas for some home
automation projects and have never really gotten around to them. I was
wondering if there would be any interest if I documented and released
all the plans?
Here's some pictures

http://i210.photobucket.com/albums/bb314/Brightan/overview.jpg
http://i210.photobucket.com/albums/bb314/Brightan/levitonmountingbracket.jpg
http://i210.photobucket.com/albums/bb314/Brightan/incase.jpg
http://i210.photobucket.com/albums/bb314/Brightan/standoffswithIOexpansion.jpg
http://i210.photobucket.com/albums/bb314/Brightan/5portCANexpansion.jpg

It uses the two SPI ports, converted to 3.3v and brought out to two
sockets that an Xbee (Zigbee) radio can plug into. Other boards that
can plug in are RS232, USB, and ethernet (Xport and DigiPort)
The processor is a HCS12DP256/512 with CAN transceivers (brought out to
RJ45), SPI EEmem, RTC, 5.12v precision A/D ref and is designed to mount
into a standard home automation cabinet or a low cost potting case
I have other boards for I/O expansion and for a 5 port CAN hub.

What I am looking for would be some gage of interest before going to the
effort to do this but I would also like to see a few people commit to
writing some drivers for the add-on's, Xbee and Ethernet specifically.
They would then be included in the package (with credit given, of
course). I only have the one prototype so you would have to build your
own boards or arrange a group purchase if there was enough interest.

Steve

--
Steven D. Letkeman BSc.
Zanthic Technologies Inc.
www.zanthic.com Embedded micro-controllers and CAN interfaces

------------------------------------



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Hey Steve,
This looks...amazing. My friends and I (all masters students) have been
thinking about doing something very similar. I know that all of us would be
really interested in something of this nature. I'm not sure what I can
commit to at this time, but I will spread the idea to my crew and see what
they think.

Nick P.

On Mon, Jan 5, 2009 at 9:15 AM, Steve Letkeman wrote:

> I designed the following board last year with some ideas for some home
> automation projects and have never really gotten around to them. I was
> wondering if there would be any interest if I documented and released
> all the plans?
> Here's some pictures
>
> http://i210.photobucket.com/albums/bb314/Brightan/overview.jpg
>
> http://i210.photobucket.com/albums/bb314/Brightan/levitonmountingbracket.jpg
> http://i210.photobucket.com/albums/bb314/Brightan/incase.jpg
>
> http://i210.photobucket.com/albums/bb314/Brightan/standoffswithIOexpansion.jpg
> http://i210.photobucket.com/albums/bb314/Brightan/5portCANexpansion.jpg
>
> It uses the two SPI ports, converted to 3.3v and brought out to two
> sockets that an Xbee (Zigbee) radio can plug into. Other boards that
> can plug in are RS232, USB, and ethernet (Xport and DigiPort)
> The processor is a HCS12DP256/512 with CAN transceivers (brought out to
> RJ45), SPI EEmem, RTC, 5.12v precision A/D ref and is designed to mount
> into a standard home automation cabinet or a low cost potting case
> I have other boards for I/O expansion and for a 5 port CAN hub.
>
> What I am looking for would be some gage of interest before going to the
> effort to do this but I would also like to see a few people commit to
> writing some drivers for the add-on's, Xbee and Ethernet specifically.
> They would then be included in the package (with credit given, of
> course). I only have the one prototype so you would have to build your
> own boards or arrange a group purchase if there was enough interest.
>
> Steve
>
> --
> Steven D. Letkeman BSc.
> Zanthic Technologies Inc.
> www.zanthic.com Embedded micro-controllers and CAN interfaces
>
>
>
[Non-text portions of this message have been removed]
------------------------------------

______________________________
Stellaris® MCU Family: New Parts, New Package, New Price.


(You need to be a member of 68hc12 -- send a blank email to 68hc12-subscribe@yahoogroups.com )

thanks, good to hear that there is some interest. BTW, I totally
mangled the proc name, it
is the 9S12DP512

Nix Knacks wrote:
>
> Hey Steve,
> This looks...amazing. My friends and I (all masters students) have been
> thinking about doing something very similar. I know that all of us
> would be
> really interested in something of this nature. I'm not sure what I can
> commit to at this time, but I will spread the idea to my crew and see what
> they think.
>
> Nick P.
>
> On Mon, Jan 5, 2009 at 9:15 AM, Steve Letkeman
> >wrote:
>
> > I designed the following board last year with some ideas for some home
> > automation projects and have never really gotten around to them. I was
> > wondering if there would be any interest if I documented and released
> > all the plans?
> > Here's some pictures
> >
> > http://i210.photobucket.com/albums/bb314/Brightan/overview.jpg
>
> >
> >
> http://i210.photobucket.com/albums/bb314/Brightan/levitonmountingbracket.jpg
>
> > http://i210.photobucket.com/albums/bb314/Brightan/incase.jpg
>
> >
> >
> http://i210.photobucket.com/albums/bb314/Brightan/standoffswithIOexpansion.jpg
>
> >
> http://i210.photobucket.com/albums/bb314/Brightan/5portCANexpansion.jpg
>
> >
> > It uses the two SPI ports, converted to 3.3v and brought out to two
> > sockets that an Xbee (Zigbee) radio can plug into. Other boards that
> > can plug in are RS232, USB, and ethernet (Xport and DigiPort)
> > The processor is a HCS12DP256/512 with CAN transceivers (brought out to
> > RJ45), SPI EEmem, RTC, 5.12v precision A/D ref and is designed to mount
> > into a standard home automation cabinet or a low cost potting case
> > I have other boards for I/O expansion and for a 5 port CAN hub.
> >
> > What I am looking for would be some gage of interest before going to the
> > effort to do this but I would also like to see a few people commit to
> > writing some drivers for the add-on's, Xbee and Ethernet specifically.
> > They would then be included in the package (with credit given, of
> > course). I only have the one prototype so you would have to build your
> > own boards or arrange a group purchase if there was enough interest.
> >
> > Steve
> >
> > --
> > Steven D. Letkeman BSc.
> > Zanthic Technologies Inc.
> > www.zanthic.com Embedded micro-controllers and CAN interfaces
> >
> >
> > [Non-text portions of this message have been removed]
> ------------------------------------------------------------------------
>
> No virus found in this incoming message.
> Checked by AVG.
> Version: 7.5.552 / Virus Database: 270.10.2/1876 - Release Date: 05/01/2009 9:44 AM
>
------------------------------------



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