[Gta04-owner] OT: edit OM wiki - was Re: charging gta04 on my bicycle

Alexander Lehner lehner at edv-buero-lehner.de
Fri Jul 11 19:20:20 CEST 2014

I just tried to link this thread on my Openmoko Wiki page, where I've 
already collected some charging ideas.
But - I'm not allowed to edit my own page, even though I'm logged in.
'View source' says, I have to be part of the administrator group.

Any idea what's going wrong?


On Fri, 11 Jul 2014, Andreas Kemnade wrote:

> Hi,
> On Fri, 11 Jul 2014 08:55:10 +0200
> "Dr. H. Nikolaus Schaller" <hns at goldelico.com> wrote:
>> Hi,
>> the charger is a little critical about the VBUS voltage. It reports an issue if >5.2 V and drops charging if <4.4 V.
>> But charging is only (re)started if VBUS goes below ca. 1.5V.
>> So there is a situation for VBUS voltages where it does not charge even if you have 5.0V.
>> Andreas has modified things to make it work on a bike:
>> http://www.ohsw.de/gta04-otg.pdf
>> http://www.ohsw.de/gta04-bike.pdf
> Just the most important things at a glance:
> echo on >/sys/bus/platform/devices/twl4030_bci/lin
> is the key to charge at a bike. That will give around 500mA.
> Then it tries to charge with whatever voltage Vbus is. You should turn
> that off again after cycling.
> I did a lot of experiments with my bike+electronics. So you see a lot
> of things in the slides which is not necessary for just charging the
> gta04 with a hub dynamo. I started to cycle with a gta0X in the Summer
> 2008. So that presentation is a bit of a summary of all things I tried
> out.
> btw: That photo with me and my bike near the north cape tunnel was also
> taken by a swiss cyclist doing a long trip
> One thing about airport security: In Stockholm-Skavsta I boarded a
> plane with the electronics dismounted in 2008, In Trondheim (Norway) I
> left the electronics at the bike (with the hub dynamo disconnected)
> while boarding the plane in 2011. Both times no problems.
> That is a good reminder to finally put my schematics online.
> Greetings
> Andreas Kemnade

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