Subject:
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Re: wireless sensors, and battery life: time synch
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 2 Jun 2005 17:35:28 GMT
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Original-From:
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Bruce Boyes <BBOYES@SYSTRONIX.COMsaynotospam>
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Viewed:
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1119 times
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At 01:13 AM 6/1/2005, Ralph Hempel wrote:
> Like USB. USB is simple, reliable and rugged. And it's fast. All this
> talk about independent sensors talking via radio waves is interesting
> though. I still think that properly designing the system so that
> everything plays well together is a different story....
Yes -- and this is exactly Zigbee's target. BT was originally aimed at PC,
PDA, peripheral communication, and it could have done well at that. Now I
think it is eclipsed by the low cost and 10-100X better speed of 801.11b/g.
Zigbee has from the start been aimed at sensors and actuators
communicating, with long battery life. So it stands a good chance of
succeeding there. There's no other widely supported method which has
Zigbee's intent.
Part of the battery life issue, as you allude, is not listening all the
time. To make this happen, nodes have to share a common and precise time
base. Then they just have to wake up at the allotted time. This is harder
than it sounds, and is the subject of standards such as IEEE1588. We plan
to experiment with this with our Zigbee nodes, since the power savings can
be really significant.
Regards
Bruce
------- WWW.SYSTRONIX.COM ----------
Real embedded Java and much more
+1-801-534-1017 Salt Lake City, USA
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Message has 1 Reply:
 | | Re: wireless sensors, and battery life: time synch
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| "Bruce Boyes" <lego-robotics@crynwr.com> wrote in message news:6.2.1.2.2.20050...ion.com... (...) maybe it should be done in the same way as rfid id cards let's say when controler wants to wake the sensor up it sends the signal and the sensor (all (...) (19 years ago, 11-Jun-05, to lugnet.robotics)
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Message is in Reply To:
| | Re: BlueTooth bad, Zigbee good
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| (...) Anytime you have something listening for signals to wake up on, it will consume power. Even at 5 or 10 mA, you'll run through a standard AA battery pretty quickly - never mind coin cells. (...) When it came out, it was pretty cutting edge - in (...) (19 years ago, 1-Jun-05, to lugnet.robotics)
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