[Ovmsdev] USB port fragility
Chris van der Meijden
chris at arachnon.de
Thu Oct 1 03:33:45 HKT 2020
Not my day today ...
The system was completely gone, so I took the OVMS out of the car.
Tried carefully to put the USB cable on and bam ...
For the second time now the connector broke off.
I will take a forced OVMS break now ...
Chris
Am Montag, den 10.08.2020, 08:09 +0300 schrieb Jarkko Ruoho:
> Hi,
>
> USB-C would be good for future proofing.
>
> Another mechanically lasting option would be fixed cable. It's also
> very ugly :)
>
> In my experience also shaking could be a problem, if you have the
> USB-cable connected. So maybe Micheal's warning should include also a
> warning against vehicle usage with USB-cable always connected to the
> device. Hot glue with good installation (also cable supported near
> the connector), should last there quite well.
>
> I have an electrified lawnmower, where I use Arduino for the blade
> speed control. Due to blade imbalance there is more shake than in an
> electric car, but micro-USB connectors broke there in less than one
> hour. Mini-USB variants lasted longer, but I think that's just a
> small incremental improvement. Now it works fine, as I have no cable
> connected during normal operation.
>
>
>
> ke 5. elok. 2020 klo 18.23 Collin Kidder (collink at kkmfg.com)
> kirjoitti:
> > I've had my fair share of USB connector failures over the years.
> > Actually, that is the reason that all EVTV boards have had USB-B
> > (the type you see on a printer) ports for years now. The giant USB-
> > B connector is not likely to break off and hasn't ever done so for
> > us. I'll bet you probably don't want to switch to such a huge
> > connector but it solved the problem for us.
> >
> > On Tue, Aug 4, 2020 at 2:51 AM Mark Webb-Johnson <mark at webb-johnson
> > .net> wrote:
> > > In this batch we tried to address the reported / experienced
> > > problems:
> > > USB port dislodged with rough handling - change was to increase
> > > solder pad area and adjust thermal profile when solderingLarge
> > > capacitors dislodged during shipment - change was to
> > > increase solder pad area and adjust thermal profile when
> > > solderingReports of GPS Antenna non functional (no continuity) -
> > > change to new (more robust) internal antenna cable
> > >
> > > We have also seen #3 seen internally, during random QC checks,
> > > with the GSM Antenna (although no reports from users).
> > >
> > > If you remember, back when v3.2 was released we had to change
> > > that internal antenna cable (due to ROHS issues with the type of
> > > plastic used). Since then we have had a number of reported issues
> > > with GPS reception that were traced back to poor contacts or no
> > > continuity with these internal antennas (particularly the batch
> > > late last year). So, we (a) add a QC step to check continuity and
> > > ‘wiggle’ the antennas to ensure they are stable, and (b) change
> > > the component to a ROHS compatible antenna similar to the
> > > previous one we used. The new component feels much more solid
> > > (particularly when connecting to the modem PCB) and so far tests
> > > 100% with no QC failures.
> > >
> > > Regards, Mark.
> > >
> > > > On 4 Aug 2020, at 2:39 PM, Michael Balzer <dexter at expeedo.de>
> > > > wrote:
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > Great, that looks much more rigid and should solve the
> > > > issue.
> > > >
> > > >
> > > >
> > > > What's the reason for / benefit of the thicker antenna
> > > > cables? Also
> > > > just rigidity, or do they have an effect on signal
> > > > strength?
> > > >
> > > >
> > > >
> > > > Regards,
> > > >
> > > > Michael
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > Am 04.08.20 um 03:24 schrieb Mark
> > > > Webb-Johnson:
> > > >
> > > >
> > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > > The small solder area is my suspicion too, and a
> > > > > relatively easy fix. Through hole would be better but
> > > > > would
> > > > > require a new component and circuit redesign (with
> > > > > associated
> > > > > complexity and re-certification issues). Here are
> > > > > some pictures
> > > > > of the 2020-06-15 batch with the changes. But it will
> > > > > be some
> > > > > time before distribution stock is cleared out and
> > > > > those start to
> > > > > be shipped. Note also that 2020-06-15 also includes a
> > > > > change to
> > > > > new thicker antenna cables for both GPS and GSM.
> > > > >
> > > > >
> > > > >
> > > > > Regards, Mark.
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > > > On 4 Aug 2020, at 9:11 AM, Craig Leres <leres at x
> > > > > > se.com> wrote:
> > > > > >
> > > > > >
> > > > > >
> > > > > > On 2020-08-03 01:26, Michael Balzer wrote:
> > > > > >
> > > > > >
> > > > > > > I've had multiple cases
> > > > > > > now of damaged and broken off USB
> > > > > > > ports.
> > > > > > >
> > > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > > I managed a mechanical "no heat" desolder
> > > > > > of the usb
> > > > > > port on one of my modules last year (I
> > > > > > wasn't careful
> > > > > > when sliding the seat back with a cable
> > > > > > plugged in).
> > > > > > When I took it apart I could see that there
> > > > > > was not very
> > > > > > much solder in the four holes that secure
> > > > > > the usb shell
> > > > > > to the board. At the time my suspicion was
> > > > > > that the
> > > > > > small amount of solder from the factory
> > > > > > wave solder made
> > > > > > for a weak bond. I was lucky that I didn't
> > > > > > lift any pads
> > > > > > and was able to resolder it.
> > > > > >
> > > > > >
> > > > > >
> > > > > > Craig
> > > > > >
> > > > > > ___________________________________________
> > > > > > ____
> > > > > >
> > > > > > OvmsDev mailing list
> > > > > >
> > > > > > OvmsDev at lists.openvehicles.com
> > > > > >
> > > > > > http://lists.openvehicles.com/mailman/listi
> > > > > > nfo/ovmsdev
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > >
> > > >
> > > >
> > > > --
> > > > Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
> > > > Fon 02333 / 833 5735 * Handy 0176 / 206 989 26
> > > >
> > > >
> > > >
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