[Tinkerphones] Community Digest, Vol 56, Issue 1: latest Openmoko/GTA04 tinkering: wireless charger

[H. Nikolaus Schaller]

Hi David,

> Am 03.01.2017 um 11:28 schrieb David Heath <dheath.pr at gmail.com>:
> 
> Thank you. I have been wondering whether Qi would be possible. Can the receiver be placed inside the case or would there be problems? I assume it should not be exposed?

Well, it can be placed inside, above the µSD/SIM card if we leave off the Mini-USB plug
like shown in this photo:



But then it is difficult to connect it to the internal 5V power (although not
impossible - needs to fiddle two wires through the case). And the antenna wires
must somehow be connected/glued to the battery cover.

This all makes it much more difficult to open and access SIM/µSD or open the whole
device for other mods. Not to forget that there is risk to rupture the cables.

Another thing to be considered is that the receiver chip might get warm and should
not be too close to the battery.

So exposing it externally seems to be a good compromise for opening the GTA04. It
should only be sealed by some glue or a 3D printed "bump" so that it is not possible to
make a short circuit :)

What I have as an idea for a next generation version is to add an (optional) µUSB
socket so that it also can also be used as a Mini-to-Micro-USB adapter (there is
a currently unused power switch in the chip).

BR,
Nikolaus

> 
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> 
> On 1 Jan 2017 6:00 am, <community-request at tinkerphones.org> wrote:
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> Today's Topics:
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>    1. latest Openmoko/GTA04 tinkering: wireless charger
>       (H. Nikolaus Schaller)
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> 
> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Sat, 31 Dec 2016 17:30:57 +0100
> From: "H. Nikolaus Schaller" <hns at goldelico.com>
> To: Tinkerphones Community <community at tinkerphones.org>
> Cc: List for Openmoko community discussion
>         <community at lists.openmoko.org>
> Subject: [Tinkerphones] latest Openmoko/GTA04 tinkering: wireless
>         charger
> Message-ID: <9B8A0A6E-4CBC-4A81-B98D-E3B0F6775166 at goldelico.com>
> Content-Type: text/plain; charset=us-ascii
> 
> Hi,
> I spent some time to develop a Qi charger for the GTA01/02/04 devices
> and here its is:
> 
>         https://www.youtube.com/watch?v=LsSdDYHx7d4
> 
> Enjoy and happy new year,
> Nikolaus
> 
> 
> 
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