Ya: backlit keyboard - Rii Mini case study
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.
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.
> 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
> 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?
>> The difference may be in the space between "Wireless" and "USB".
>> Without it, it's Cypress' 2.4 GHz stuff, about which they proudly
>> | 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)
>> | | | |
>> Wibree - - - x 1000 10 ? "open" ? 
>> IEEE 802.15.4 - x x x 20-250 ? many open  ? 
>> 6LoWPAN n/a n/a n/a n/a open  open? 
>> MiWi - - - x -250 ? ? unpublished ? 
>> WirelessHART - - - x ? ? QPSK for-pay roylty-free 
>> ZigBee - - - x 250-500 75 QPSK 
>> INSTEON - - x - ? 50 FSK for-pay? ? 
>> ISO/IEC 18000-7 for-pay? RAND 
>> DASH7 x - - - 28-100 250 FSK,GFSK = = 
>> ONE-NET ? x x ? ? ? FSK ? roylty-free 
>> Wavenis x x x - 5-100 100+ ? ? ? 
>> Wireless USB > 3 GHz 53-480 10 MD-OFDM open  ? 
>> Z-Wave - x x - 10- 40 30 GFSK NDA ? 
>>  http://www.dash7.org/DASH7%20WP%20ed1.pdf
>>  http://www.dash7.org/index.php?option=com_content&view=article&id=13&Itemid=15
>>  http://en.wikipedia.org/wiki/Z-wave
>>  http://en.wikipedia.org/wiki/Wavenis
>>  http://en.wikipedia.org/wiki/Wireless_USB
>>  http://www.usb.org/developers/wusb/wusb_2007_0214.zip
>>  http://en.wikipedia.org/wiki/ONE-NET
>> (Site requires registration and moderator approval to even read any
>> technical information.)
>>  http://en.wikipedia.org/wiki/Wibree
>>  http://en.wikipedia.org/wiki/6LoWPAN
>>  http://tools.ietf.org/html/rfc4944
>>  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.
>>  http://en.wikipedia.org/wiki/INSTEON
>>  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.
>>  http://en.wikipedia.org/wiki/WirelessHART
>> - Werner
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