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Wireless Sensor Nets Make Better Economic Case

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vimalkumarp
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Gold
batteries a critical component
vimalkumarp   11/2/2011 10:55:36 PM
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Many attempts have been made and are underway for implementing energy harvesting systems for powering the low power wireless sensor networks. It will be really interesting to explore a bit on these systems too

Jack Rupert, PE
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Platinum
Re: Power
Jack Rupert, PE   8/28/2011 2:53:43 PM
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Thanks.  I'll look into that....  (At the moment, it doesn't look like the website is working).

soljacobs
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Iron
Re: Power
soljacobs   8/25/2011 1:23:08 PM
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Pls go to www.tadiranbat.com or write to sales@tadiranbat.com for more info.

Jack Rupert, PE
User Rank
Platinum
Re: Power
Jack Rupert, PE   8/25/2011 12:10:51 PM
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@soljacobs Do you have any info on those batteries?

soljacobs
User Rank
Iron
Re: Power
soljacobs   8/23/2011 3:23:00 PM
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There are lithium batteries that have non-rechargeable operating lives of 25 years. They are already used in wireless devices such as utility meters and wireless sensors by the millions.

Loring Wirbel
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Blogger
Re: Power
Loring Wirbel   8/23/2011 12:33:32 PM
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Thanks for bringing up the battery issue, Jack - absolutely critical.

Loring Wirbel
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Blogger
Re: What's the real hold up?
Loring Wirbel   8/23/2011 12:32:39 PM
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Chuck, I hear different numbers all the time, but I think people expect a fairly functional (8-bit?  16/32?  ADC?) microcontroller available in high volume for well under $1, say in the 30 to 50 cent range.  Whether the low end is feasible....

Jack Rupert, PE
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Platinum
Power
Jack Rupert, PE   8/23/2011 11:40:59 AM
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Loring, I agree that one of the main things holding back widespread use is the competing standards.  When I worked for an OEM, the customers always had some other idea in mind (and a lot of times it was whatever was "hot" at the moment".

I still think the other issue is the power source.  Once battery technology evolves to where you can get a reliable long-term (i.e., year+) or self-recharging source, this tech will really take off.

Charles Murray
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Blogger
Re: What's the real hold up?
Charles Murray   8/23/2011 10:45:40 AM
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Loring: In the RFID world, we used tto hear about "nickel tags." The belief was that when nickel tags arrived, millions of products would suddenly use RFID. Is there a similar price-point goal for microcontroller-powered dust?

Loring Wirbel
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Blogger
Re: What's the real hold up?
Loring Wirbel   8/23/2011 10:22:15 AM
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Probably the biggest problem in universal adoption is that there is no single protocol that is the equivalent of 802 LANs and the seven-layer OSI prototol stack in wireless sensor nets.  ZigBee is the most common physical and data-link protocol, though there's a lot of RFID, Wireless HART, NFC, etc.  Eventually, probably all such nets will use TCP/IP and have an IP address.  But the IP connection is not obvious because the cost of nodes needs to be so low.  Until the cost of microcontroller-powered "dust" drops, we may have quite a protocol mess out there!

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