Cool, added! http://en.qi-hardware.com/wiki/Ben_WPAN
On Fri, Apr 15, 2011 at 10:29 AM, Allin Kahrl <[email protected]> wrote: > Jon- > Thanks much for adding all that. I hadn't really tuned in to Ben-WPAN > until recently, and now I feel like I understand why it's so exciting > (especially knowing how asymmetric Werner's workshop is against > conventional commercial R&D environments). > > I have one request: Is there a citation we can add to the "dark ages" > statement at > http://en.qi-hardware.com/wiki/Ben_WPAN#Is_freedom_really_innovation?_As_in_we_have_the_freedom_to_make_our_own_WPAN > ? > This sounds like an essential bit of history to inform our collective > enthusiasm for open development, but I know nothing about it. > > Thanks again. > [allin] > > On Thu, Apr 14, 2011 at 11:51 PM, [email protected] <[email protected]> wrote: > > Ok, this is all super cool. I consolidated your guys answers here: > > > > http://en.qi-hardware.com/wiki/Ben_WPAN > > > > If you guys have more to add, there are some sections that would be good > to > > get more notes like progress and outcomes. Even just those links to the > > mailing list are useful. I needed somewhere to point people. > > > > I've been talking to a bunch of people about WPAN and the innovative > parts > > of copyleft hardware. So, I might have some questions which I hope > provide > > another dimension to what we are working on, and will do my best to > > integrate onto the wiki. > > > > I'm trying to think more about why someone in the real world (consumers, > > investors, technologists, etc) would be interested in our tech. > > > > My life post-meeting-Wolfgang, I now refrain from noting speculative > > conversations I have but just not that my silence is not indicative of > > inactivity, but mostly refrain from getting people's hopes up ;) and > making > > myself sound more vaporous than I am ;) > > > > On Thu, Apr 14, 2011 at 12:25 PM, Werner Almesberger > > <[email protected]> wrote: > >> > >> I wrote: > >> > With my ATBEN/ATUSB prototypes, I've obtained good to acceptable BER > >> > for a distance between stations of 4-7 m indoors in a residential > >> > area with relatively few interferences. > >> > >> A clarification on the error rate (BER = Bit Error Rate, PER = Packet > >> Error Rate): > >> > >> IEEE 802.15.4 defines a maximum PER of 1% for a PSDU of 20 bytes. > >> This means that all bits of the PSDU, the length (1 byte) and the SFD > >> (1 byte) be received without errors, and that enough bits of the > >> preamble (4 bytes) must be received for the receiver to synchronize. > >> To keep the numbers simple, let's assume that's 200 bytes in total. > >> Thus > >> > >> 1-PER = 1-(1-BER)^200 > >> > >> With PER = 1%, we get a BER of about 50 ppm. > >> > >> Since our primary usage scenario, Internet access, would often use > >> maximum-sized packets, I used max-sized packets for my measurements as > >> well. The maximum PSDU size is 127 bytes. So we get 200+8*(127-20) = > >> 1056 bits. > >> > >> Aiming for a PER of 1% with full-sized packets, the BER has to be > >> lower, about 9.5 ppm. > >> > >> - Werner > > > > I learn a lot from you guys! So great! I'm excited by this > project...super > > excited! > > > > My friends Sean Bonner, Joi Ito and Bunnie Huang are working on this > pop-up > > project http://rdtn.org to make radiation sensors. I'm actually supposed > to > > be in Tokyo right now working with them on some other projects, but the > > tsunami/earthquake happened, and they got into this website and making > > radiation sensors. > > > > http://blog.seanbonner.com/2011/04/11/what-im-working-on-rdtn/ > > > > Well, you can imagine that I pitched them hard on copyleft hardware, but > I > > was too late and now Bunnie and some other tech companies are working on > > this *product.* > > > > However, that is not the point, but rather, I think the sensor networks > are > > super important for the future of our civilization. > > > > Part of what makes the Internet successful is that it allows for humans > to > > stay spread out more, so we don't annihilate each other. And, the success > > rate for our species increases with increase of disasters, wars, disease, > > etc, as the population increases in size. > > > > Well, sensors are part of this mix IMO. So, I look forward to seeing how > we > > can work on both sensors (getting info), sending that info > > (internet/network/WPAN), and using that info (people/us!). > > > > The Internet are the wires, but we need to extend our bodies/information > > gathering apparatuses and our senses, hence sensors are important for > > survival of our species. And, a great place for us to occupy as copyleft > > hardware. > > > > Bravo Werner! > > > > A sidenote, where should the Ben WPAN enhanced page go on the wiki? I > think > > we should have a stack of our core technologies on the main page. > > > > What else are we doing that is innovative and in that technology stack > (and > > not talking products!)? > > > > Jon > > > > -- > > Jon Phillips > > http://rejon.org/ | http://fabricatorz.com/ > > chat/skype: kidproto | irc: rejon > > +1.415.830.3884 (global) | +1-510-499-0894 (sf) > > +86-187-1003-9974 (beijing) > > > > > > _______________________________________________ > > Qi Hardware Discussion List > > Mail to list (members only): [email protected] > > Subscribe or Unsubscribe: > > http://lists.en.qi-hardware.com/mailman/listinfo/discussion > > > > _______________________________________________ > Qi Hardware Discussion List > Mail to list (members only): [email protected] > Subscribe or Unsubscribe: > http://lists.en.qi-hardware.com/mailman/listinfo/discussion > -- Jon Phillips http://rejon.org/ | http://fabricatorz.com/ chat/skype: kidproto | irc: rejon +1.415.830.3884 (global) | +1-510-499-0894 (sf) +86-187-1003-9974 (beijing)
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