Ya: backlit keyboard - Rii Mini case study

Jon Phillips jon at rejon.org
Tue Jul 13 13:45:49 EDT 2010


:)

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
>>
>> _______________________________________________
>> Qi Developer Mailing List
>> Mail to list (members only): developer at lists.qi-hardware.com
>> Subscribe or Unsubscribe: http://en.qi-hardware.com/mailman/listinfo/developer
>>
>
> _______________________________________________
> Qi Developer Mailing List
> Mail to list (members only): developer at lists.qi-hardware.com
> Subscribe or Unsubscribe: http://en.qi-hardware.com/mailman/listinfo/developer
>



-- 
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)




More information about the discussion mailing list


interactive