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" 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 > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > 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 ---------------------------------------------------------------
Message
Re: [AVR-Chat] Re: RFID with Thermometers
2005-04-08 by Jim Wagner