[Cumulus] Some Cumulus experiences

[flieger-axel at web.de]

Hi list,

I have connected my N810 via a Nokia car adapter to an external 12V lead
battery and had never problems with the charge during flight. Maybe if the
device battery is down, it takes awhile before you can boot the device. I
never tried to startup from this state.

Concerning more task support in Cumulus, if have been asked already by other
people. I'm not a competition flyer therefore that is not the number one on
my todo lists. If Eggert has time in the next winter to supprort me, it
should no problem to add that.

Fliegergrüße Axel

2011/8/2 Eggert Ehmke <eggert.ehmke at berlin.de>

> Hello Hendrik, hello Peter,
>
> thanks for your suggestions. I will build in a resistor too and try to
> increase voltage a little. However, the N810 definitely shows the message
> "Charging battery".
>
> Regards
> Eggert
>
> On Tuesday 02 August 2011 12:29:53 Peter Turczak wrote:
> > Hi there,
> >
> > Hendrik Hoeth wrote:
> > >> I think partially loaded it works ok. In this case it was plain empty
> > >> and rejected to boot when connected to external. I have a separate 12V
> > >> lead battery with a self build 5V adapter. It had worked before and
> > >> worked fine the next day, so I think my adapter is ok.
> > >
> > > Are you sure the N810 _charges_ on that adapter, or does it only run
> > > without actually charging the battery? I tried a 5V supply first, and
> > > while it would run and draw current, it refused to charge the battery.
> > > Turns out that the Nokia chargers actually supply a slightly higher
> > > voltage, around 5.1-5.2V if I remember correctly. So I changed my DC-DC
> > > converter and voila, it works.
> >
> > While building my own adapter for the N810 I stumbled across the same
> > problem. When the current of the adapter is _not_ current limited the
> Nokia
> > devices will consider it a "special" cable. See
> >
> http://www.herjulf.se/solar/charge-station/Nokia_2-mm_DC_Charging_Interface
> > _Specification_v1_2_en.pdf for details. The N810 expects a source
> resistance
> > of about .5 Ohms. I cracked open a cheap 3rd party charger and found a
> .56
> > Ohms/1W resistor in line with the +5 Volts ;). I used four parallel 2.2
> Ohm
> > resistors to have enough heat dissipation.
> >
> > Fliegergrüße,
> >   Peter
> > _______________________________________________
>
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