Design Con 2015
Breaking News
Comments
Newest First | Oldest First | Threaded View
<<   <   Page 2 / 3   >   >>
krisi
User Rank
CEO
Re: range (Re: licensing)
krisi   5/7/2014 11:41:19 AM
NO RATINGS
Kirs, what happens with 1km range installation when line of site gets blocked?

krisi
User Rank
CEO
Re: Zigbee vs 6LoWPAN
krisi   5/7/2014 11:39:45 AM
NO RATINGS
thank you Kris for explaining the sunchronization issue...Kris

Kris Pister
User Rank
Rookie
Re: Zigbee vs 6LoWPAN
Kris Pister   5/7/2014 11:36:39 AM
NO RATINGS
To date, Zigbee has not time synchronized their networks.  Battery operated end nodes wake up whenever they like to send a message.  A router node needs to leave its radio receiver on all of the time because it never knows when that message will arrive.  Typical receivers burn around 20mA (Dust's is about 5mA).

You need a really big battery to pull 20mA for a decade.

If you're time synchronized, then the routing node knows exactly when to wake up to receive an incoming packet.  It can wake up ten times per second and still run at under 1% duty cycle, meaning that your average current consumption is in the tens of microAmps, not mA.  That lets you run the entire network, even the routers, on inexpensive lithium batteries for a decade or more.

We've been working in the IETF and IEEE on the standards that will enable Zigbee to adopt this kind of low power networking for IP.

Kris Pister
User Rank
Rookie
range (Re: licensing)
Kris Pister   5/7/2014 11:27:44 AM
NO RATINGS
Range depends on antenna type and elevation.  With simple antennas you can get more than a kilometer per hop if you have line of sight and are a couple of meters off of the ground.  If you bury them in the ground (e.g. for parking monitoring), then you're lucky to get 10 meters.  "Average" deployments in buildings and industrial environments get many tens to hundreds of meters per hop.

Kris Pister
User Rank
Rookie
Re: licensing
Kris Pister   5/7/2014 11:24:10 AM
NO RATINGS
No license required, and very simple.  Buy an IP network, deploy it, look at your data live on the internet via browser, cell phone, data analytics software, whatever.

(Or read the IEEE and IETF standards and build your own implementation, no license required)

Integration is easy - analog or serial inputs go straight to cloud databases.

krisi
User Rank
CEO
Re: Zigbee vs 6LoWPAN
krisi   5/7/2014 11:08:27 AM
NO RATINGS
What is so special about ZigBee repeaters that requires to have them batteries? Data in, data out, nothing else to do...Kris

rick merritt
User Rank
Author
Zigbee vs 6LoWPAN
rick merritt   5/7/2014 10:58:57 AM
NO RATINGS
I did not realize that for large installations Zigbee requires repeaters that cannot be pratically run on batteries. Is this true Zigbee-ites?

Jonas Berge
User Rank
Rookie
Re: ahead of the time
Jonas Berge   5/6/2014 5:47:44 AM
NO RATINGS
In my personal oppinion a "thing" doesn't have to have an IP address to be part of the IoT. RFID is also IoT  - its origin. See Wikipedia. What they do need is a unique identifier. The sensor needs some kind of secure connection through the Internet so it can be accessed remotely. So you can have sensors on Dust in your friedge at home, or WirelessHART in your plant, or on CAN bus in your car, with a connection to a box that has an IP address and is connected to the Internet. This way these sensors can be accessed from anywhere in the world. Preferably through a VPN connection - so you get an IntRAnet of Things. At least in plants this is already happening today. Control valves on offshore platorms are being diagnosed for failures by experts sitting in a cosy office onshore.

boblespam
User Rank
CEO
licensing
boblespam   5/6/2014 2:23:13 AM
NO RATINGS
Apparently you need to buy a license to build-up a Dust network, and also a WirelessHart certification. It looks complicated.

Do we have an idea of the max distance beetween two nodes ?

krisi
User Rank
CEO
Re: ahead of the time
krisi   5/5/2014 9:02:58 PM
NO RATINGS
You just tell the fridge to re-order the right beer...and have no TV privelages for a week...and threaten to replace with more reliable model if it continues to mis-behave!

<<   <   Page 2 / 3   >   >>


Top Comments of the Week
Flash Poll
Like Us on Facebook

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
EE Life
Frankenstein's Fix, Teardowns, Sideshows, Design Contests, Reader Content & More
<b><a href=Betajet">

The Circle – The Future's Imperfect in the Present Tense
Betajet
5 comments
The Circle, a satirical, dystopian novel published in 2013 by San Francisco-based writer Dave Eggers, is about a large, very powerful technology company that combines aspects of Google, ...

Max Maxfield

Recommended Reads From the Engineer's Bookshelf
Max Maxfield
27 comments
I'm not sure if I read more than most folks or not, but I do I know that I spend quite a lot of time reading. I hate to be idle, so I always have a book or two somewhere about my person -- ...

Martin Rowe

Make This Engineering Museum a Reality
Martin Rowe
Post a comment
Vincent Valentine is a man on a mission. He wants to make the first house to ever have a telephone into a telephone museum. Without help, it may not happen.

Rich Quinnell

Making the Grade in Industrial Design
Rich Quinnell
16 comments
As every developer knows, there are the paper specifications for a product design, and then there are the real requirements. The paper specs are dry, bland, and rigidly numeric, making ...

Special Video Section
The LT8640 is a 42V, 5A synchronous step-down regulator ...
The LTC2000 high-speed DAC has low noise and excellent ...
How do you protect the load and ensure output continues to ...
General-purpose DACs have applications in instrumentation, ...
Linear Technology demonstrates its latest measurement ...
10:29
Demos from Maxim Integrated at Electronica 2014 show ...
Bosch CEO Stefan Finkbeiner shows off latest combo and ...
STMicroelectronics demoed this simple gesture control ...
Keysight shows you what signals lurk in real-time at 510MHz ...
TE Connectivity's clear-plastic, full-size model car shows ...
Why culture makes Linear Tech a winner.
Recently formed Architects of Modern Power consortium ...
Specially modified Corvette C7 Stingray responds to ex Indy ...
Avago’s ACPL-K30T is the first solid-state driver qualified ...
NXP launches its line of multi-gate, multifunction, ...
Doug Bailey, VP of marketing at Power Integrations, gives a ...
See how to ease software bring-up with DesignWare IP ...
DesignWare IP Prototyping Kits enable fast software ...
This video explores the LT3086, a new member of our LDO+ ...
In today’s modern electronic systems, the need for power ...