- Posted by jbuges on October 28, 2008
Today i was searching some information about the interference do it by the physical medium in the electromagnetism propagation.
I found a interesting email write by Adrian Popa, Director Emeritus, Hughes Research Laboratories.
link
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- Posted by jbuges on October 19, 2008
I wish now talk about the new technology from Freescale, Synkro.
Synkro
is a new technology to control the diferents devices in ours homes.
Synkro is in the top of the 802.11.4 standard and uses the low cost
radios. The diferencies with zigbee are that synkro can’t do meshes and
it’s unable to do hoping it’s a replacement from the IR technology that
predominate in the home devices controls.
Infrared technology has
diferents problems, It’s a directional technology, the infrared beam
need to be redirect to the device to comunicated with them, it’s not
possible if the infrared diode is not in the line of vision of the
device.
The infrared also has interference with the new plasma tvs. The plasma
devices absorb the infrared light and made a lot of comunications
errors.
Synkro would made possible to comunicate in the oposite way. With
synkro the home device can comunicate with the control, sending
information about the tv billboard, doing some automation as record
movies or do interactive polls with the tv programs.
In the technology way, the syncro protocol is optimized to use the less
interferencied channels by the wifi spots.
To deploy this technology and create a comunity to support this technology some of the top company in consumers electronic and home electronic: SONY, SAMSUNG, Panasonic and Philips and three of the top silicon providers Freescale, Texas Instrument and Oki founded the rf4ce consortium.
Soon i want to post some articles about programming with the syncro protocol
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- Posted by jbuges on October 5, 2008
This is my last purchase from digikey
this is the raven kit from atmel. I will use this kit to design a new generation of controls systems.
The atmel radio ic has the best sensivity in the 802.15.4 radios.
Atmel has his own zigbee stack. I am evaluating the stack to my designs.
I have a jennic kit to develop zigbee als.
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- Posted by jbuges on October 4, 2008
I want to write a resume of the technologies to improve the comunications in zigbee meshes.
There are 2 ways to improve the comunications.
using more power, more DB of output
or improbe the antenas design
In the first case, there is a hardware design from texas instrument with cc2591 or Low power Amps Designs from CEL for the Freescale SOC.
the second way is new antenas designs.
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- Posted by jbuges on October 4, 2008
In recent months, I've been following the work of christopher wang. He is involved in the design and programming of a zigbee stack in the top of contiki os. Today i am downloading the code and review it. My first impression is that the code is clean and very easy to read. I was reading adam dunkels code of his contiki os and it's easy to read too (great tamden, zigbee + contiki os).
You can follow his experience at his blog
http://freaklabs.org
Next week i travel to paris to FTF freescale conference and i do not have time to install and test the code but i promise to do at the return of the journey.
Today the stack only run in the emulator but christopher begin to port to a hardware soon.
The documentation is generate by the doxigen tool the link is:
http://freaklabs.org/freakz/v0_5/html/index.html
And the code you can download at sourceforge
http://sourceforge.net/projects/freakz/
Cheers
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