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New Chips Enable 2.4 GHz Sensor Networks
mindless4210 writes "Oki announced today that the world's first fully compliant IEEE 802.15.4 and ZigBee chip has been developed. The technology promises to start a new generation of wireless sensor networks, utilizing the unlicensed 2.4 GHz spectrum. The new IC integrates the digital circuit-based MAC and PHY with the analog circuit-based RF onto a single chip. The company also developed a kit which enables fast production of sensor networks which could control air conditioning, lighting, fire alarm systems, and many other applications. The low power consumption of the chip enables multi-year operation with only dry-cell batteries."
The company also developed a kit which enables fast production of sensor networks which could control air conditioning, lighting, fire alarm systems, and many other applications. The low power consumption of the chip enables multi-year operation with only dry-cell batteries."
We have a motion sensor based security system here at home, and it goes off once a month when a spider finds its way into the body of the sensor. I'll stick with light switches thank you.
You'll have that sometimes...
In one way I'm scared for how this could be used to trample privacy rights, or abused in myriad ways. On the other hand, the implications for my home media, climate control, and the like is certainly enticing....
I guess it's just a matter of who makes it, and what it's made/marketed for....
Only the purest of souls seek enlightenment. Everyone else just wants power.
Whats really running thorugh people's minds is "does this mean that i'll have to upgrade my card if they upgrade their routers to continue stealing my internet from my neighbors?"
What a nightmare that was. That crap only worked about 50% of the time... until my neighbor used their cordless phone, or my microwave ran, etc. etc. The ISP was continually tracking down sources of interferance, and installing new filters, amplifiers, etc.
I've now moved to a provider that uses (motorolla) equipment that runs in the 5GHz range. This stuff seems to work flawlessly.
Lots of companies have single-chip-2.4Ghz radio ICs. Like nvlsi.no or ChipCon. And NVLSI is better by a mile - quite literally a single chip 2.4GHz radio - make a sensor network in a few weeks .... if you find someone to help you solder the QFN pkg (goddamn SMD pkgs).Perhaps they bundle the ZigBee protocol within the IC ??
I'm glad my WiFi network is 802.11a. If this goes into wide use there's going to be so much noise in 2.4Ghz that 2.4Ghz wireless is going to be really hard to continue using. (Heck, it already is)
As to the techno-babble, most 802.11a/b/g cards require a separate chip for the MAC (which handles the 802.11 level 2 protocol -- some chipsets do most of this on the host), the PHY (which handles the digital signal processing) and the RF section (which is black magic). Putting them all on one chip allows for smaller and hopefully less power-hungry devices.
Why can't we just have story moderation? Editors would simply approve/disprove stories for voting, obvious crap would get dumped, anything mildly interesting would get posted to the moderation page. logged in users would then have the opportunity to look through all the stories submitted (minus the total crap) if they wanted. People who only want to see the best would simply choose to only view the top X% of stories of the last X# of hours. It's not really that different than moderation and it'd be easy to implement.
I'd imagine some editors might not like it because it would reduce their ego, but it would make for a much better slashdot.
I can count to 1023 on my hands. Ask me about #132.
I've been waiting for ZigBee hardware from Motorola for quite a while now. Several months ago, their web site proudly proclaimed that their HCS08 series chips would support ZigBee. I'm now using HCS08 chips, but all mention of ZigBee has since vanished from the product page.
Makes me wonder if there's some not-quite-working ZigBee RF hardware on the chip...
2.4ghz my nuts!
I've consulted the company and they have assured me that you will indeed be able to have 2.4ghz on your nuts with this chip.
-Jamon
I can count to 1023 on my hands. Ask me about #132.
That's called Kuro5hin.
LOAD "SIG",8,1
From what I understand, this is not really due to the spectrum itself, but the quality of components used when building the equipment such as your broadband modem. For example, a Microwave operates at 2ghz. If your hardware used cheap filters (like capacitors) when they contructed your device, these signals can interfere. If they spent the money up front on good components, they would not have this problem. It is really only a matter of a few cents when choosing components, but so many times - especially when dealing with the consumer market - there is price pressure on what the finished product has to cost. They shave in every area they can including the filters that make sure microwaves and cordless phones do not interfere. The same thing can happen at 5ghz as well if the hardware is not correctly specified.
The low power consumption of the chip enables multi-year operation with only dry-cell batteries.
Would it be possible, I wonder, to have solar-powered sensors, or even sensors powered by storing vibrational energy (for use in, say, air ducts)? Of course, sensors placed in easily accessible locations probably wouldn't benefit too much from never needing battery replacements. However, I can think of a few applications where you'd want to have a sensor in locations that are not readily accessible for maintenance. Perhaps even inserting the sensors during construction of the building, in locations that will be completely unaccessible once construction us complete.
Anyway, it's just a thought, and probably one that someone working on the project has already had.
The new chip has several key bennefits, which include the use of synchronous serial interface when connecting to a host CPU, low-power consumption enabling long time operation with dry-cell batteries, and a 0.22 micron low-leakage process. The package is quite small at only 7x7(mm).
Just me or does this seem like the perfect chip for a subdermal implant. Seriosly, stick one of these babys next to a pacemaker and you can control your heartrate via the TCP/IP or encrypt the signal and have law enforcments firearms disable themselves in the hands of criminals (ala Judge Dredd ) Coupled with a proper set of sensors soldiers vital stats could be relayed to a central command unit without bulk transmiters, or just one transmitter ( Aliens (1986)
Maybe I shouldn't watch so many movies.
"It's all just meme meme around here"
Just what we need, more usage of the 2.4GHz spectrum, as if its not used enough. We need more unlicenced spectrum set aside for the ever increasing amount of wireless devices. 2.4 is pretty much saturated in most populated areas.
Now I can have fun remotely controlling my neighbor's air conditioner...
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I suggest you check out CocoonTech.com, it's a site dedicated to Home Autmation, Theaters and Security, This article got posted there this morning before it appeared on slashdot ;) Z-wave, which is 'similar' to ZigBee is one of the newer but fast growing protocols in the HA world. There have been many times where manufactures have said they have developped an x-10 killer protocol, but so far ZigBee & Z-wave seem to be ones of the few which might actually become widely accepted (or in some cases is being deployed already). Home Automation for the masses!
Most people in the HA community use 1-wire sensors (you can get a few free samples from the Dallas Maxim site) as they are very cheap. You can interface them with a system using the serial port for a relatively low price too. Check out this thread on CocoonTech.com, it's discussing this technology, and all the interface available: 1-wire thread. As for your lights/appliances, I recommend good quality x10 switches (such as SmartLinc or Lightolier), or you can go with Z-Wave, which is similar to ZigBee, it's wireless, and each switch can act as an RF router to get the signal as far as possible. Pretty cool stuff. My entire house is automated this way, I can even start my car using voice, phone, web, email, you name it (right now it does it when I wake up in the morning). Doesn't have to be expensive either. If you do insist on still going with Ethernet, You would probably want to use a Global Cache device, which can process inputs, control outputs, IR and more all over IP.
To my knowledge, there are A LOT MORE consumer devices that operatate at or near the 2.4GHz range as compared to devices that operate at or near 5GHz. Cordless phones are the perfect example. -- Thus, there is a lot more interference at the 2.4GHz range, and thus a lot harder for filters to actually do their job.
Microwave ovens are at 2.4GHz, same as WiFi.
This isn't coincidence. The reason the 2.4GHz band was available for innovation is that regular spectrum users considered it unusable due to the industrial equipment operating there. It's called the ISM band, for Industrial, Scientific and Medical.
Microwave ovens are shielded for safety reasons but they start off ~20,000 times more powerful than a WiFi card. The noise is hard to filter because it's surprisingly broadband. The ultra-cheap power supplies drag the magnetron frequency up and down from resonance.
In general you're absolutely right, though. Most consumer RF equipment is too cheaply built to tolerate strong signals outside the intended operating frequency.
First of all Zigbee is no protocol for wireless sensor networks. The curently supported network topology is to inflexible and the maximum number of devices per subnet (255) is not nearly big enough that Zigbee is of much use for ambitious installations. There are better solutions for sensor nets and zigbees priorities lie in differentz directions than that.
Secondly neither 802.15.4 (The phy and mac layer) nor the Zigbee Protocol (network and app layers) are fully specified. The current specs lack important sections like flexible network topologies (currently only some kind of tree topology is supported), ad-hoc-networking, location of devivces and several other features which the Zigbee alliance proposed and announced but are not documented right now.
In its current form zigbee is not much more than some kind of "low power usb". You can network up to 255 devices with several kilobit/s datarate, but that is about all you can do. All the features that make up good sensor networks are either not yet specified or not even part of the proposed zigbee spec.
There are other and better suited projects for such applications and there are many other companies which have 2,4 GHz sulutions ready for at least to years now. Nordic VLSI for example with their nRF24E1 (www.nvlsi.no). Although in my opinion there are other frequency-bands better suited than 2,4 GHz. It might be licence-free but is much to crowded to be of good use. Because of that many companies also offer 868/422 MHz solutions.
These solutions might lack the zigbee ready logo, but there are numerous other projects which are in my opinion better suited for sensor networks. The most popular being at the moment tinyos (http://webs.cs.berkeley.edu/tos/) an open source os for sensor networks with an extensive library of protocol modules to use fpr your own sensor application. You can even download circuit plans for your own custom design.
Jeff