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help!!!

help!!!

2005-04-04 by aswinefy2003

i am using atmega 32

i loaded the eeprom through avr studio by program,

when i switch off the whole set up and view the contents of eeprom the 
next time through avr ,it is all set to ff .please tell why this is .
do'nt the  eeprom has retention feature

Re: [AVR-Chat] help!!!

2005-04-04 by Ralph Hilton

On Mon, 04 Apr 2005 08:32:52 -0000 you wrote:

>
>
>i am using atmega 32
>
>i loaded the eeprom through avr studio by program,
>
>when i switch off the whole set up and view the contents of eeprom the 
>next time through avr ,it is all set to ff .please tell why this is .
>do'nt the  eeprom has retention feature  

If you reprogram the chip then the eeprom is erased by default. There is a fuse
bit to set if you want to retain eeprom contents.
--
Ralph Hilton
http://www.ralphhilton.org
C-Meter: http://www.cmeter.org
FZAOINT http://www.fzaoint.net

Re: [AVR-Chat] help!!!

2005-04-04 by John Samperi

At 06:32 PM 4/04/2005, you wrote:

>i loaded the eeprom through avr studio by program,
>
>when i switch off the whole set up and view the contents of eeprom the
>next time through avr ,it is all set to ff .please tell why this is .
>do'nt the  eeprom has retention feature

Is this the EEPROM of the chip or the memory eeprom in AVR studio?
If you have 'uploaded/downloaded memory' and then you switch off the
computer or exit Studio then you loose all the memory content.

Sorry if this is a silly question but it's not clear to me. It seems
lost in translation.

Regards

John Samperi

******************************************************
                         Ampertronics Pty. Ltd.
   11 Brokenwood Place Baulkham Hills, NSW 2153 AUSTRALIA
          Tel. (02) 9674-6495       Fax (02) 9674-8745
                Email: samperi@ampertronics.com.au
                  Website  http://www.ampertronics.com.au
* Electronic Design   * Custom Products   * Contract Assembly
******************************************************

RFID with Thermometers

2005-04-04 by Arif YILMAZ

Hi to all, 
Well I m nowadays interested in RFID devices and wonder if anyone of you
experts have ever seen an RFID transponder with a thermal sensor? Or a
thermometer function internally?

Thanks for the attention and  help in the near future :)

Re: [AVR-Chat] RFID with Thermometers

2005-04-04 by Jim Wagner

No, I have mot. This sort of thing IS planned for EPC Gen3
or Gen4 protocol. Gen2 is just, now, starting to filter out
and that has taken well over a year. At this time, EPC is
primarily for UHF (850-950MHz) and does NOT deal with 13MHz
RFID or 125KHz RFID.

Jim


On Mon, 4 Apr 2005 16:41:07 +0300
 "Arif YILMAZ" <arif.yilmaz@bilten.metu.edu.tr> wrote:
> 
> 
> 
> 
> 
> 
> Hi to all, 
> Well I m nowadays interested in RFID devices and wonder
> if anyone of you
> experts have ever seen an RFID transponder with a thermal
> sensor? Or a
> thermometer function internally?
> 
> Thanks for the attention and&nbsp; help in the near
> future :)
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> Yahoo! Groups Links
> 
> To visit your group on the web, go
> to:http://groups.yahoo.com/group/AVR-Chat/&nbsp;
> To unsubscribe from this group, send an email
> to:AVR-Chat-unsubscribe@yahoogroups.com&nbsp;
> Your use of Yahoo! Groups is subject to the Yahoo! Terms
> of Service.
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 

---------------------------------------------------------------
The Think Different Store
http://www.thinkdifferentstore.com/
For All Your Mac Gear
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RE: [AVR-Chat] RFID with Thermometers

2005-04-06 by Arif YILMAZ

Thanks 
Show quoted textHide quoted text
-----Original Message-----
From: Jim Wagner [mailto:jim_d_wagner@applelinks.net] 
Sent: Monday, April 04, 2005 9:50 PM
To: AVR-Chat@yahoogroups.com
Subject: Re: [AVR-Chat] RFID with Thermometers


No, I have mot. This sort of thing IS planned for EPC Gen3
or Gen4 protocol. Gen2 is just, now, starting to filter out
and that has taken well over a year. At this time, EPC is
primarily for UHF (850-950MHz) and does NOT deal with 13MHz
RFID or 125KHz RFID.

Jim


On Mon, 4 Apr 2005 16:41:07 +0300
 "Arif YILMAZ" <arif.yilmaz@bilten.metu.edu.tr> wrote:
> 
> 
> 
> 
> 
> 
> Hi to all, 
> Well I m nowadays interested in RFID devices and wonder
> if anyone of you
> experts have ever seen an RFID transponder with a thermal
> sensor? Or a
> thermometer function internally?
> 
> Thanks for the attention and&nbsp; help in the near
> future :)
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> Yahoo! Groups Links
> 
> To visit your group on the web, go
> to:http://groups.yahoo.com/group/AVR-Chat/&nbsp;
> To unsubscribe from this group, send an email
> to:AVR-Chat-unsubscribe@yahoogroups.com&nbsp;
> Your use of Yahoo! Groups is subject to the Yahoo! Terms
> of Service.
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 

---------------------------------------------------------------
The Think Different Store
http://www.thinkdifferentstore.com/
For All Your Mac Gear
---------------------------------------------------------------


 
Yahoo! Groups Links

Re: [AVR-Chat] RFID with Thermometers

2005-04-06 by Jesper Hansen

While at the RFID stuff......

I need a very small tag reader module or rather a chip for it so I can 
build it into my own handheld unit (size and power limitations).
Also, small flexible tags, preferably like stickers. About 1-2" byt 2".

Any hints of where to look, I've tried searching the net but find only
huge tags and antennas for use with contatiners e.t.c.

/Jesper

----- Original Message ----- 
Show quoted textHide quoted text
From: "Jim Wagner" <jim_d_wagner@applelinks.net>
To: <AVR-Chat@yahoogroups.com>
Sent: Monday, April 04, 2005 8:49 PM
Subject: Re: [AVR-Chat] RFID with Thermometers


> 
> No, I have mot. This sort of thing IS planned for EPC Gen3
> or Gen4 protocol. Gen2 is just, now, starting to filter out
> and that has taken well over a year. At this time, EPC is
> primarily for UHF (850-950MHz) and does NOT deal with 13MHz
> RFID or 125KHz RFID.
> 
> Jim
> 
> 
> On Mon, 4 Apr 2005 16:41:07 +0300
> "Arif YILMAZ" <arif.yilmaz@bilten.metu.edu.tr> wrote:
>> 
>> 
>> 
>> 
>> 
>> 
>> Hi to all, 
>> Well I m nowadays interested in RFID devices and wonder
>> if anyone of you
>> experts have ever seen an RFID transponder with a thermal
>> sensor? Or a
>> thermometer function internally?
>> 
>> Thanks for the attention and&nbsp; help in the near
>> future :)
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> Yahoo! Groups Links
>> 
>> To visit your group on the web, go
>> to:http://groups.yahoo.com/group/AVR-Chat/&nbsp;
>> To unsubscribe from this group, send an email
>> to:AVR-Chat-unsubscribe@yahoogroups.com&nbsp;
>> Your use of Yahoo! Groups is subject to the Yahoo! Terms
>> of Service.
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
> 
> ---------------------------------------------------------------
> The Think Different Store
> http://www.thinkdifferentstore.com/
> For All Your Mac Gear
> ---------------------------------------------------------------
> 
> 
> 
> Yahoo! Groups Links
> 
> 
> 
> 
> 
> 
> 
>

RE: [AVR-Chat] RFID with Thermometers

2005-04-06 by Javier Fiasche

TI has sticker tag and some readers ic's. take a look at http://www.ti.com/rfid/default.htm
-----Mensaje original-----
De: Jesper Hansen [mailto:jesperh@telia.com]
Enviado el: Miércoles, 06 de Abril de 2005 08:49 a.m.
Para: AVR-Chat@yahoogroups.com
Asunto: Re: [AVR-Chat] RFID with Thermometers

While at the RFID stuff......

I need a very small tag reader module or rather a chip for it so I can
build it into my own handheld unit (size and power limitations).
Also, small flexible tags, preferably like stickers. About 1-2" byt 2".

Any hints of where to look, I've tried searching the net but find only
huge tags and antennas for use with contatiners e.t.c.

/Jesper

----- Original Message -----
Show quoted textHide quoted text
From: "Jim Wagner"
To:
Sent: Monday, April 04, 2005 8:49 PM
Subject: Re: [AVR-Chat] RFID with Thermometers


>
> No, I have mot. This sort of thing IS planned for EPC Gen3
> or Gen4 protocol. Gen2 is just, now, starting to filter out
> and that has taken well over a year. At this time, EPC is
> primarily for UHF (850-950MHz) and does NOT deal with 13MHz
> RFID or 125KHz RFID.
>
> Jim
>
>
> On Mon, 4 Apr 2005 16:41:07 +0300
> "Arif YILMAZ" wrote:
>>
>>
>>
>>
>>
>>
>> Hi to all,
>> Well I m nowadays interested in RFID devices and wonder
>;> if anyone of you
>> experts have ever seen an RFID transponder with a thermal
>> sensor? Or a
>> thermometer function internally?
>>
>> Thanks for the attention and help in the near
>> future :)
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> Yahoo! Groups Links
>>
>> To visit your group on the web, go
>> to:http://groups.yahoo.com/group/AVR-Chat/
>> To unsubscribe from this group, send an email
>> to:AVR-Chat-unsubscribe@yahoogroups.com
>> Your use of Yahoo! Groups is subject to the Yahoo! Terms
>> of Service.
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>
> ---------------------------------------------------------------
> The Think Different Store
> http://www.thinkdifferentstore.com/
> For All Your Mac Gear
> ---------------------------------------------------------------
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
>
Visita www.tutopia.com y comienza a navegar más rápido en Internet. Tutopia es Internet para todos.

Re: [AVR-Chat] RFID with Thermometers

2005-04-06 by Jim Wagner

Are you interested in the low frequency (magnetically)
coupled tags, the 1-bit "anti-theft" tags, the 13MHz
system, or the UHF (850-950MHz) tags?

Jim

On Wed, 6 Apr 2005 13:49:02 +0200
 "Jesper Hansen" <jesperh@telia.com> wrote:
> 
> 
> 
> 
> 
> While at the RFID stuff......
> 
> I need a very small tag reader module or rather a chip
> for it so I can 
> build it into my own handheld unit (size and power
> limitations).
> Also, small flexible tags, preferably like stickers.
> About 1-2" byt 2".
> 
> Any hints of where to look, I've tried searching the net
> but find only
> huge tags and antennas for use with contatiners e.t.c.
> 
> /Jesper
> 
> ----- Original Message ----- 
> From: "Jim Wagner"
> <jim_d_wagner@applelinks.net>
> To: <AVR-Chat@yahoogroups.com>
> Sent: Monday, April 04, 2005 8:49 PM
> Subject: Re: [AVR-Chat] RFID with Thermometers
> 
> 
> > 
> > No, I have mot. This sort of thing IS planned for
> EPC Gen3
> > or Gen4 protocol. Gen2 is just, now, starting to
> filter out
> > and that has taken well over a year. At this time,
> EPC is
> > primarily for UHF (850-950MHz) and does NOT deal
> with 13MHz
> > RFID or 125KHz RFID.
> > 
> > Jim
> > 
> > 
> > On Mon, 4 Apr 2005 16:41:07 +0300
> > "Arif YILMAZ"
> <arif.yilmaz@bilten.metu.edu.tr> wrote:
> >> 
> >> 
> >> 
> >> 
> >> 
> >> 
> >> Hi to all, 
> >> Well I m nowadays interested in RFID devices and
> wonder
> >> if anyone of you
> >> experts have ever seen an RFID transponder with
> a thermal
> >> sensor? Or a
> >> thermometer function internally?
> >> 
> >> Thanks for the attention and&nbsp; help in
> the near
> >> future :)
> >> 
> >> 
> >> 
> >> 
> >> 
> >> 
> >> 
> >> 
> >> 
> >> 
> >> 
> >> Yahoo! Groups Links
> >> 
> >> To visit your group on the web, go
> >>
> to:http://groups.yahoo.com/group/AVR-Chat/&nbsp;
> >> To unsubscribe from this group, send an email
> >>
> to:AVR-Chat-unsubscribe@yahoogroups.com&nbsp;
> >> Your use of Yahoo! Groups is subject to the
> Yahoo! Terms
> >> of Service.
> >> 
> >> 
> >> 
> >> 
> >> 
> >> 
> >> 
> >> 
> >> 
> >> 
> >> 
> > 
> >
>
---------------------------------------------------------------
> > The Think Different Store
> > http://www.thinkdifferentstore.com/
> > For All Your Mac Gear
> >
>
---------------------------------------------------------------
> > 
> > 
> > 
> > Yahoo! Groups Links
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> >
> 
> 
> 
> 
> 
> 
> 
> 
> 
> Yahoo! Groups Links
> 
> To visit your group on the web, go
> to:http://groups.yahoo.com/group/AVR-Chat/ 
> To unsubscribe from this group, send an email
> to:AVR-Chat-unsubscribe@yahoogroups.com 
> Your use of Yahoo! Groups is subject to the Yahoo! Terms
> of Service.
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 

---------------------------------------------------------------
The Think Different Store
http://www.thinkdifferentstore.com/
For All Your Mac Gear
---------------------------------------------------------------

Re: [AVR-Chat] RFID with Thermometers

2005-04-06 by Jesper Hansen

It doesn't really matter. Size does ;-) Especially for the 
antenna. I suppose the high frequency tags 13MHz or
higher would be best in that aspect.
I had a look at the Texas site and they seem to have a
lot of useful 13Mhz stuff, but nothing for the UHF band.
I only need a simple 64-bit readonly transponder and
a reading distance of about 1-2 inches.
After my TI visit, the antenna seem to be the factor that
will determine the size (and obviously also reading distance 
e.t.c.)
The receiver and antenna needs to be built into a small
handheld device, about the of a mobile phone.

The transponder stickers from TI seems relatively expensive
at about USD 1.5 in quantity, where a CD inlay or similar
transponder is only 1/3 of that.

This is a new area for me, tips and ideas are much appreciated.


/Jesper


----- Original Message ----- 
Show quoted textHide quoted text
From: "Jim Wagner" <jim_d_wagner@applelinks.net>
To: <AVR-Chat@yahoogroups.com>
Sent: Wednesday, April 06, 2005 4:51 PM
Subject: Re: [AVR-Chat] RFID with Thermometers


> 
> Are you interested in the low frequency (magnetically)
> coupled tags, the 1-bit "anti-theft" tags, the 13MHz
> system, or the UHF (850-950MHz) tags?
> 
> Jim
> 
> On Wed, 6 Apr 2005 13:49:02 +0200
> "Jesper Hansen" <jesperh@telia.com> wrote:
>> 
>> 
>> 
>> 
>> 
>> While at the RFID stuff......
>> 
>> I need a very small tag reader module or rather a chip
>> for it so I can 
>> build it into my own handheld unit (size and power
>> limitations).
>> Also, small flexible tags, preferably like stickers.
>> About 1-2" byt 2".
>> 
>> Any hints of where to look, I've tried searching the net
>> but find only
>> huge tags and antennas for use with contatiners e.t.c.
>> 
>> /Jesper
>> 
>> ----- Original Message ----- 
>> From: "Jim Wagner"
>> <jim_d_wagner@applelinks.net>
>> To: <AVR-Chat@yahoogroups.com>
>> Sent: Monday, April 04, 2005 8:49 PM
>> Subject: Re: [AVR-Chat] RFID with Thermometers
>> 
>> 
>> > 
>> > No, I have mot. This sort of thing IS planned for
>> EPC Gen3
>> > or Gen4 protocol. Gen2 is just, now, starting to
>> filter out
>> > and that has taken well over a year. At this time,
>> EPC is
>> > primarily for UHF (850-950MHz) and does NOT deal
>> with 13MHz
>> > RFID or 125KHz RFID.
>> > 
>> > Jim
>> > 
>> > 
>> > On Mon, 4 Apr 2005 16:41:07 +0300
>> > "Arif YILMAZ"
>> <arif.yilmaz@bilten.metu.edu.tr> wrote:
>> >> 
>> >> 
>> >> 
>> >> 
>> >> 
>> >> 
>> >> Hi to all, 
>> >> Well I m nowadays interested in RFID devices and
>> wonder
>> >> if anyone of you
>> >> experts have ever seen an RFID transponder with
>> a thermal
>> >> sensor? Or a
>> >> thermometer function internally?
>> >> 
>> >> Thanks for the attention and&nbsp; help in
>> the near
>> >> future :)
>> >> 
>> >> 
>> >> 
>> >> 
>> >> 
>> >> 
>> >> 
>> >> 
>> >> 
>> >> 
>> >> 
>> >> Yahoo! Groups Links
>> >> 
>> >> To visit your group on the web, go
>> >>
>> to:http://groups.yahoo.com/group/AVR-Chat/&nbsp;
>> >> To unsubscribe from this group, send an email
>> >>
>> to:AVR-Chat-unsubscribe@yahoogroups.com&nbsp;
>> >> Your use of Yahoo! Groups is subject to the
>> Yahoo! Terms
>> >> of Service.
>> >> 
>> >> 
>> >> 
>> >> 
>> >> 
>> >> 
>> >> 
>> >> 
>> >> 
>> >> 
>> >> 
>> > 
>> >
>>
> ---------------------------------------------------------------
>> > The Think Different Store
>> > http://www.thinkdifferentstore.com/
>> > For All Your Mac Gear
>> >
>>
> ---------------------------------------------------------------
>> > 
>> > 
>> > 
>> > Yahoo! Groups Links
>> > 
>> > 
>> > 
>> > 
>> > 
>> > 
>> > 
>> >
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> Yahoo! Groups Links
>> 
>> To visit your group on the web, go
>> to:http://groups.yahoo.com/group/AVR-Chat/ 
>> To unsubscribe from this group, send an email
>> to:AVR-Chat-unsubscribe@yahoogroups.com 
>> Your use of Yahoo! Groups is subject to the Yahoo! Terms
>> of Service.
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
> 
> ---------------------------------------------------------------
> The Think Different Store
> http://www.thinkdifferentstore.com/
> For All Your Mac Gear
> ---------------------------------------------------------------
> 
> 
> 
> Yahoo! Groups Links
> 
> 
> 
> 
> 
> 
> 
>

Re: RFID with Thermometers

2005-04-07 by membruce

Arif,

Just for giggles, you may want to look at mote and dust sensor
systems. It is much more expensive then RFID but more flexible. It
sounds like you are mass producing this and the price would knock the
technology out of the running but I though I would bring it up. It may
give you some ideas.

Go to http://www.tinyos.net/ and start from there.

Bruce

--- In AVR-Chat@yahoogroups.com, "Jesper Hansen" <jesperh@t...> wrote:
Show quoted textHide quoted text
> It doesn't really matter. Size does ;-) Especially for the 
> antenna. I suppose the high frequency tags 13MHz or
> higher would be best in that aspect.
> I had a look at the Texas site and they seem to have a
> lot of useful 13Mhz stuff, but nothing for the UHF band.
> I only need a simple 64-bit readonly transponder and
> a reading distance of about 1-2 inches.
> After my TI visit, the antenna seem to be the factor that
> will determine the size (and obviously also reading distance 
> e.t.c.)
> The receiver and antenna needs to be built into a small
> handheld device, about the of a mobile phone.
> 
> The transponder stickers from TI seems relatively expensive
> at about USD 1.5 in quantity, where a CD inlay or similar
> transponder is only 1/3 of that.
> 
> This is a new area for me, tips and ideas are much appreciated.
> 
> 
> /Jesper
> 
> 
> ----- Original Message ----- 
> From: "Jim Wagner" <jim_d_wagner@a...>
> To: <AVR-Chat@yahoogroups.com>
> Sent: Wednesday, April 06, 2005 4:51 PM
> Subject: Re: [AVR-Chat] RFID with Thermometers
> 
> 
> > 
> > Are you interested in the low frequency (magnetically)
> > coupled tags, the 1-bit "anti-theft" tags, the 13MHz
> > system, or the UHF (850-950MHz) tags?
> > 
> > Jim
> > 
> > On Wed, 6 Apr 2005 13:49:02 +0200
> > "Jesper Hansen" <jesperh@t...> wrote:
> >> 
> >> 
> >> 
> >> 
> >> 
> >> While at the RFID stuff......
> >> 
> >> I need a very small tag reader module or rather a chip
> >> for it so I can 
> >> build it into my own handheld unit (size and power
> >> limitations).
> >> Also, small flexible tags, preferably like stickers.
> >> About 1-2" byt 2".
> >> 
> >> Any hints of where to look, I've tried searching the net
> >> but find only
> >> huge tags and antennas for use with contatiners e.t.c.
> >> 
> >> /Jesper
> >> 
> >> ----- Original Message ----- 
> >> From: "Jim Wagner"
> >> jim_d_wagner@a...
> >> To: AVR-Chat@yahoogroups.com
> >> Sent: Monday, April 04, 2005 8:49 PM
> >> Subject: Re: [AVR-Chat] RFID with Thermometers
> >> 
> >> 
> >> > 
> >> > No, I have mot. This sort of thing IS planned for
> >> EPC Gen3
> >> > or Gen4 protocol. Gen2 is just, now, starting to
> >> filter out
> >> > and that has taken well over a year. At this time,
> >> EPC is
> >> > primarily for UHF (850-950MHz) and does NOT deal
> >> with 13MHz
> >> > RFID or 125KHz RFID.
> >> > 
> >> > Jim
> >> > 
> >> > 
> >> > On Mon, 4 Apr 2005 16:41:07 +0300
> >> > "Arif YILMAZ"
> >> arif.yilmaz@b... wrote:
> >> >> 
> >> >> 
> >> >> 
> >> >> 
> >> >> 
> >> >> 
> >> >> Hi to all, 
> >> >> Well I m nowadays interested in RFID devices and
> >> wonder
> >> >> if anyone of you
> >> >> experts have ever seen an RFID transponder with
> >> a thermal
> >> >> sensor? Or a
> >> >> thermometer function internally?
> >> >> 
> >> >> Thanks for the attention and&nbsp; help in
> >> the near
> >> >> future :)
> >> >> 
> >> >> 
> >> >> 
> >> >> 
> >> >> 
> >> >> 
> >> >> 
> >> >> 
> >> >> 
> >> >> 
> >> >> 
> >> >> Yahoo! Groups Links
> >> >> 
> >> >> To visit your group on the web, go
> >> >>
> >> to:http://groups.yahoo.com/group/AVR-Chat/&nbsp;
> >> >> To unsubscribe from this group, send an email
> >> >>
> >> to:AVR-Chat-unsubscribe@yahoogroups.com&nbsp;
> >> >> Your use of Yahoo! Groups is subject to the
> >> Yahoo! Terms
> >> >> of Service.
> >> >> 
> >> >> 
> >> >> 
> >> >> 
> >> >> 
> >> >> 
> >> >> 
> >> >> 
> >> >> 
> >> >> 
> >> >> 
> >> > 
> >> >
> >>
> > ---------------------------------------------------------------
> >> > The Think Different Store
> >> > http://www.thinkdifferentstore.com/
> >> > For All Your Mac Gear
> >> >
> >>
> > ---------------------------------------------------------------
> >> > 
> >> > 
> >> > 
> >> > Yahoo! Groups Links
> >> > 
> >> > 
> >> > 
> >> > 
> >> > 
> >> > 
> >> > 
> >> >
> >> 
> >> 
> >> 
> >> 
> >> 
> >> 
> >> 
> >> 
> >> 
> >> Yahoo! Groups Links
> >> 
> >> To visit your group on the web, go
> >> to:http://groups.yahoo.com/group/AVR-Chat/ 
> >> To unsubscribe from this group, send an email
> >> to:AVR-Chat-unsubscribe@yahoogroups.com 
> >> Your use of Yahoo! Groups is subject to the Yahoo! Terms
> >> of Service.
> >> 
> >> 
> >> 
> >> 
> >> 
> >> 
> >> 
> >> 
> >> 
> >> 
> >> 
> > 
> > ---------------------------------------------------------------
> > The Think Different Store
> > http://www.thinkdifferentstore.com/
> > For All Your Mac Gear
> > ---------------------------------------------------------------
> > 
> > 
> > 
> > Yahoo! Groups Links
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> >

Re: [AVR-Chat] Re: RFID with Thermometers

2005-04-08 by Jim Wagner

Most of the stuff I know about is powered from the field
generted by the reader. There is barely enough energy to
run a non-volatile shift-register to clock out serial
number data. 

There is a system called "SpeedPass" used to collect
highway tolls. And, there is a similar one used for some
gasoline sales. I think these are both active and the
"tags" are real transceivers. Both systems are pretty big
and not cheap. 

For the UHF tag system being adopted by Wal*Mart and other
retail stores, the readers, even in quantity, tend to be in
the 750USD to 1000USD. Vendors selling to developers in
this area include ThingMagic and Sirit. ThingMagic has
developers kits that probably go for 1500USD (my guess).
All have pretty simple serial I/O. They take about 3/4 Amp
from a 5V supply when transmitting. The actual reader tends
to be about the size of a pack of cigarettes, or a bit
larger (though ThingMagic packages it in an enclosure and
with a true RS232 I/O that makes it bigger). 

The problem with the UHF stuff for your application is that
the tags are designed for just one purpose (serial number
recovery) and they would be very difficult to get other
data through them as you would need to make connections at
the chip level, if it is even possible.

Jim


On Thu, 07 Apr 2005 18:59:14 -0000
 "membruce" <membruce@earthlink.net> wrote:
> 
> Arif,
> 
> Just for giggles, you may want to look at mote and dust
> sensor
> systems. It is much more expensive then RFID but more
> flexible. It
> sounds like you are mass producing this and the price
> would knock the
> technology out of the running but I though I would bring
> it up. It may
> give you some ideas.
> 
> Go to http://www.tinyos.net/ and start from there.
> 
> Bruce
> 
> --- In AVR-Chat@yahoogroups.com, "Jesper
> Hansen" <jesperh@t...> wrote:
> > It doesn't really matter. Size does ;-) Especially
> for the 
> > antenna. I suppose the high frequency tags 13MHz or
> > higher would be best in that aspect.
> > I had a look at the Texas site and they seem to have
> a
> > lot of useful 13Mhz stuff, but nothing for the UHF
> band.
> > I only need a simple 64-bit readonly transponder and
> > a reading distance of about 1-2 inches.
> > After my TI visit, the antenna seem to be the factor
> that
> > will determine the size (and obviously also reading
> distance 
> > e.t.c.)
> > The receiver and antenna needs to be built into a
> small
> > handheld device, about the of a mobile phone.
> > 
> > The transponder stickers from TI seems relatively
> expensive
> > at about USD 1.5 in quantity, where a CD inlay or
> similar
> > transponder is only 1/3 of that.
> > 
> > This is a new area for me, tips and ideas are much
> appreciated.
> > 
> > 
> > /Jesper
> > 
> > 
> > ----- Original Message ----- 
> > From: "Jim Wagner"
> <jim_d_wagner@a...>
> > To: <AVR-Chat@yahoogroups.com>
> > Sent: Wednesday, April 06, 2005 4:51 PM
> > Subject: Re: [AVR-Chat] RFID with Thermometers
> > 
> > 
> > > 
> > > Are you interested in the low frequency
> (magnetically)
> > > coupled tags, the 1-bit "anti-theft"
> tags, the 13MHz
> > > system, or the UHF (850-950MHz) tags?
> > > 
> > > Jim
> > > 
> > > On Wed, 6 Apr 2005 13:49:02 +0200
> > > "Jesper Hansen" <jesperh@t...>
> wrote:
> > >> 
> > >> 
> > >> 
> > >> 
> > >> 
> > >> While at the RFID stuff......
> > >> 
> > >> I need a very small tag reader module or
> rather a chip
> > >> for it so I can 
> > >> build it into my own handheld unit (size
> and power
> > >> limitations).
> > >> Also, small flexible tags, preferably like
> stickers.
> > >> About 1-2&quot; byt 2&quot;.
> > >> 
> > >> Any hints of where to look, I've tried
> searching the net
> > >> but find only
> > >> huge tags and antennas for use with
> contatiners e.t.c.
> > >> 
> > >> /Jesper
> > >> 
> > >> ----- Original Message ----- 
> > >> From: &quot;Jim Wagner&quot;
> > >> jim_d_wagner@a...
> > >> To: AVR-Chat@yahoogroups.com
> > >> Sent: Monday, April 04, 2005 8:49 PM
> > >> Subject: Re: [AVR-Chat] RFID with
> Thermometers
> > >> 
> > >> 
> > >> &gt; 
> > >> &gt; No, I have mot. This sort of thing
> IS planned for
> > >> EPC Gen3
> > >> &gt; or Gen4 protocol. Gen2 is just,
> now, starting to
> > >> filter out
> > >> &gt; and that has taken well over a
> year. At this time,
> > >> EPC is
> > >> &gt; primarily for UHF (850-950MHz) and
> does NOT deal
> > >> with 13MHz
> > >> &gt; RFID or 125KHz RFID.
> > >> &gt; 
> > >> &gt; Jim
> > >> &gt; 
> > >> &gt; 
> > >> &gt; On Mon, 4 Apr 2005 16:41:07 +0300
> > >> &gt; &quot;Arif YILMAZ&quot;
> > >> arif.yilmaz@b... wrote:
> > >> &gt;&gt; 
> > >> &gt;&gt; 
> > >> &gt;&gt; 
> > >> &gt;&gt; 
> > >> &gt;&gt; 
> > >> &gt;&gt; 
> > >> &gt;&gt; Hi to all, 
> > >> &gt;&gt; Well I m nowadays
> interested in RFID devices and
> > >> wonder
> > >> &gt;&gt; if anyone of you
> > >> &gt;&gt; experts have ever seen an
> RFID transponder with
> > >> a thermal
> > >> &gt;&gt; sensor? Or a
> > >> &gt;&gt; thermometer function
> internally?
> > >> &gt;&gt; 
> > >> &gt;&gt; Thanks for the attention
> and&amp;nbsp; help in
> > >> the near
> > >> &gt;&gt; future :)
> > >> &gt;&gt; 
> > >> &gt;&gt; 
> > >> &gt;&gt; 
> > >> &gt;&gt; 
> > >> &gt;&gt; 
> > >> &gt;&gt; 
> > >> &gt;&gt; 
> > >> &gt;&gt; 
> > >> &gt;&gt; 
> > >> &gt;&gt; 
> > >> &gt;&gt; 
> > >> &gt;&gt; Yahoo! Groups Links
> > >> &gt;&gt; 
> > >> &gt;&gt; To visit your group on the
> web, go
> > >> &gt;&gt;
> > >>
> to:http://groups.yahoo.com/group/AVR-Chat/&amp;nbsp;
> > >> &gt;&gt; To unsubscribe from this
> group, send an email
> > >> &gt;&gt;
> > >>
> to:AVR-Chat-unsubscribe@yahoogroups.com&amp;nbsp;
> > >> &gt;&gt; Your use of Yahoo! Groups
> is subject to the
> > >> Yahoo! Terms
> > >> &gt;&gt; of Service.
> > >> &gt;&gt; 
> > >> &gt;&gt; 
> > >> &gt;&gt; 
> > >> &gt;&gt; 
> > >> &gt;&gt; 
> > >> &gt;&gt; 
> > >> &gt;&gt; 
> > >> &gt;&gt; 
> > >> &gt;&gt; 
> > >> &gt;&gt; 
> > >> &gt;&gt; 
> > >> &gt; 
> > >> &gt;
> > >>
> > >
>
---------------------------------------------------------------
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> http://www.thinkdifferentstore.com/
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> > >> &gt; 
> > >> &gt; 
> > >> &gt; 
> > >> &gt;
> > >> 
> > >> 
> > >> 
> > >> 
> > >> 
> > >> 
> > >> 
> > >> 
> > >> 
> > >> Yahoo! Groups Links
> > >> 
> > >> To visit your group on the web, go
> > >>
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> > > 
> > >
>
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> > > 
> > > 
> > > Yahoo! Groups Links
> > > 
> > > 
> > > 
> > > 
> > > 
> > > 
> > > 
> > >
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> Yahoo! Groups Links
> 
> To visit your group on the web, go
> to:http://groups.yahoo.com/group/AVR-Chat/ 
> To unsubscribe from this group, send an email
> to:AVR-Chat-unsubscribe@yahoogroups.com 
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