Ya: backlit keyboard - Rii Mini case study

James "Xakh" Lynch superstuff7 at gmail.com
Tue Jul 13 16:56:21 EDT 2010


I like the sound of that. People won't like not having wi-fi in their
devices. Is there really no interrnal wifi card cheaper than that
ridiculously expensive MicroSD one compatible with the NN?

On Tue, Jul 13, 2010 at 1:45 PM, Jon Phillips <jon at rejon.org> wrote:

> :)
>
> One thing we have talked about is adding an internal sd card slot so
> if one bought a large order, they could have the sd-wifi card in bulk
> to have wifi capability. That could be a good compromise, to not taint
> the devices freedom, or rather embodiment of freedom.
>
> Jon
>
> On Tue, Jul 13, 2010 at 10:25 AM, Ron K. Jeffries <rjeffries at gmail.com>
> wrote:
> > Very interesting set of references, thanks.
> >
> > Let's assume a future Nanonote includes
> > an ISM radio such as HopeRF or others.
> >
> > One can do MANY of clever things with that,
> > but using the Internet at a public hot spot isn't one of them.
> >
> > So...
> >
> > Copyleft and open? Yes!
> > Able to use the internet without being tethered? NO.
> >
> > Ben Nanonote sans direct Ethernet is a cool
> > device that almost 1000 people have purchased
> >
> > What I don't understand is how/why purity
> > of the copyleft philosophy trumps having a highly
> > desirable capability -- untethered internet access
> >
> > please don't shoot the messenger. just sayin' ;)
> > ---
> > Ron K. Jeffries
> > http://ronkjeffries.posterous.com
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > On Tue, Jul 13, 2010 at 09:39, Werner Almesberger <werner at openmoko.org>
> wrote:
> >> Wolfgang Spraul wrote:
> >>> good to see how others solved the backlight problem.
> >>
> >> I was afraid that there would be just a few LEDs but a lot of
> >> "fancy plastic" to distribute the light. It's nice that what
> >> seems to be a much more pedestrian approach works so well.
> >>
> >>> Does this have anything to do with 'USB'? First time I hear about
> WirelessUSB.
> >>> Wikipedia says WirelessUSB operates at 3.1 to 10.6 GHz, but the Cypress
> chip
> >>> talks about 2.4 GHz?
> >>> http://en.wikipedia.org/wiki/Wirelessusb
> >>
> >> The difference may be in the space between "Wireless" and "USB".
> >> Without it, it's Cypress' 2.4 GHz stuff, about which they proudly
> >> proclaim:
> >>
> >> | WirelessUSB and enCoRe are trademarks of Cypress Semiconductor.
> >>
> >> The Wiki page says that USB-IF prefers people to call theirs
> >> somewhat pompously "Certified Wireless USB". I guess now we know
> >> why :-)
> >>
> >> A good comparison:
> >> http://www.ac.tut.fi/aci/courses/ACI-31070/pdf/UWB WUSB WirelessUSB.pdf
> >>
> >>> Maybe to look at RF in Ya, we should first identify some interesting,
> free
> >>> software / GPL licensed stacks? Then find a matching module/RF IC for
> it?
> >>
> >> I'm still not sure what would be the best strategy. I've tried a
> >> search for standards (see below) but I'm not entirely happy with
> >> the results. I've now started to look at what the major chip
> >> makers have to offer.
> >>
> >>> Are you aware of any good and stable RF protocol stacks implemented in
> >>> free software?
> >>
> >> Nothing interesting beyond things that have already been mentioned.
> >> I would in fact go one step back and look for Open standards, not
> >> necessarily implementations.
> >>
> >> Here's a very rough compilation of things I found so far for the
> >> ISM bands that aren't flat out "vendor standards":
> >>
> >>                Band    Rb      Range Modulation Openness/Patents
> Ref.
> >>                434 915 kbps    m                Standard       Use
> >>                | 868 2.4       (nom)
> >>                | | | |
> >> Bluetooth
> >>  Wibree        - - - x    1000  10   ?          "open"         ?
> [8]
> >> IEEE 802.15.4   - x x x  20-250   ?   many       open [11]      ?
> [11]
> >>  6LoWPAN       n/a      n/a    n/a   n/a        open [10]      open?
> [9]
> >>  MiWi          - - - x    -250   ?   ?          unpublished    ?
> [13]
> >>  WirelessHART  - - - x    ?      ?   QPSK       for-pay
>  roylty-free [14]
> >>  ZigBee        - - - x 250-500  75   QPSK
>  [1]
> >> INSTEON         - - x -    ?     50   FSK        for-pay?       ?
> [12]
> >> ISO/IEC 18000-7                                  for-pay?       RAND
>  [2]
> >>  DASH7         x - - -  28-100 250   FSK,GFSK   =              =
> [1]
> >> ONE-NET         ? x x ?    ?     ?    FSK        ?
>  roylty-free [7]
> >> Wavenis         x x x -   5-100 100+  ?          ?              ?
> [4]
> >> UWB
> >>  Wireless USB  > 3 GHz  53-480  10   MD-OFDM    open [6]       ?
> [5]
> >> Z-Wave          - x x -  10- 40  30   GFSK       NDA            ?
> [3]
> >>
> >> [1] http://www.dash7.org/DASH7%20WP%20ed1.pdf
> >> [2]
> http://www.dash7.org/index.php?option=com_content&view=article&id=13&Itemid=15
> >>    http://www.savi.com/partners/licensees/index.php
> >>    http://www.savi.com/partners/licensees/iso-18000-7.php
> >> [3] http://en.wikipedia.org/wiki/Z-wave
> >> [4] http://en.wikipedia.org/wiki/Wavenis
> >> [5] http://en.wikipedia.org/wiki/Wireless_USB
> >> [6] http://www.usb.org/developers/wusb/wusb_2007_0214.zip
> >> [7] http://en.wikipedia.org/wiki/ONE-NET
> >>    http://one-net.info/
> >>    (Site requires registration and moderator approval to even read any
> >>    technical information.)
> >>
> http://www.one-net.info/index.php?option=com_content&view=category&layout=blog&id=2&Itemid=3
> >> [8] http://en.wikipedia.org/wiki/Wibree
> >> [9] http://en.wikipedia.org/wiki/6LoWPAN
> >> [10] http://tools.ietf.org/html/rfc4944
> >> [11] http://en.wikipedia.org/wiki/IEEE_802.15.4
> >>     (links to IEEE standard documents, with click-through license)
> >>     note: 802.15.4-2006 specifies ASK for 868/915 but requires devices
> to also
> >>     implement QPSK.
> >> [12] http://en.wikipedia.org/wiki/INSTEON
> >> [13] http://en.wikipedia.org/wiki/MiWi
> >>     http://ww1.microchip.com/downloads/en/AppNotes/MiWi Application
> Note_AN1066.pdf
> >>     Implementation tied to use of Microchip products. No indication
> about IP
> >>     in protocol.
> >> [14] http://en.wikipedia.org/wiki/WirelessHART
> >>     http://www.hartcomm.org/hcf/documents/documents_specifications.html
> >>
> >> - Werner
> >>
> >> _______________________________________________
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>
>
> --
> Jon Phillips
> http://rejon.org/
> http://fabricatorz.com/
> http://status.net/
> http://rejon.status.net + skype: kidproto
> +1.415.830.3884 (sf/global)
> +86.187.1003.9974 (china)
>
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