IN RE the previous question - ZigBee compliance (Certification); one would not expect this to include FCC approval, even if the module is a compliant module -- say on - what is the total approval / certification process and is this inclusive in the $5K (to $10k) startup figure mentioned?
Thank you all for attending. There are some questions on routers and profiles that I would prefer to answer as part of the next two days. I am available at email@example.com for consultation and training. Web site not up yet - new company!
Can a node in Zigbee network perform as a coordinator and a router at the same time? Can a coordinator be designated according to the their appearance time, i.e., the first node in the zigbee network automatically becomes the coordinator?
I'm considering using the XBee Pro 900 line from Digi because they claim over 20 miles line-of-sight (with high-gain antennas). Are their modules part of the standard (as proprietary maybe) or are they something else?
There is not an academic arrangement, but remember the real need for paying the ZigBee Alliance is to register and test a product. You can download the specs (the "public" specs) for free and you can get free stacks (software, pre-compiled) from the hardware mfrs. I teach classes and we biuld lots of things. We just can't sell them as ZigBee
I would add to the Q&A on what sensors work, you have only to look at bandwidth. Something that is sending fairly high frequency components may tax the network. Not just audio - look at seizmic or other waveform sensing - for example a heartbeat. You can get past this with pre-processing in some cases. Anything that is fairly static will work great in these networks
As to range between nodes - the mfrs claim anywhere from 10-50m open space. There are MANY factors that affect this at 2.4Ghz, including people being around. 10m is very possible, but farther than that, antenna design becomes an issue. A simple dipole or even a J (most common) may not be enough.
In implementations using the TI CC25xx SOC solutions sometimes us the RF Microdevices RF6505 front end. I am working on a design now and I need to know if the benefits are worth the cost. Do you have an opinion on this?
Good to hear that many of you have a familiarity with topologies. We will review for those of you who do not
Many asked about BT low energy - it is an attempt to bring BT to the 15.4 level of power consumption. It is, however, still a less energy efficient transmission protocol. 15.4 is still better for battery life. BTLE is better if you need any more bandwidth - we are limited to 10-30K in 15.4
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The first Tacoma Narrows Bridge was a Washington State suspension bridge that opened in 1940 and spanned the Tacoma Narrows strait of Puget Sound between Tacoma and the Kitsap Peninsula. It opened to traffic on July 1, 1940, and dramatically collapsed into Puget Sound on November 7, just four months after it opened.
Noting that we now live in an era of “confusion and ill-conceived stuff,” Ammunition design studio founder Robert Brunner, speaking at Gigaom Roadmap, said that by adding connectivity to everything and its mother, we aren't necessarily doing ourselves any favors, with many ‘things’ just fine in their unconnected state.
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