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[aprssig] APRS RFID apps? (Hot Spots design!)

Wes Johnston, AI4PX wes at ai4px.com
Wed Feb 10 18:00:29 UTC 2010

If you wan IN and OUT at the door, why not use those little keyfob data
modems on 433mhz from the reader to the processor?  Esp if there's a
checksum involved.


On Wed, Feb 10, 2010 at 12:13, Bob Bruninga <bruninga at usna.edu> wrote:

> The RAW output from the RFID reader is:
> Where S is STX (02h)
> DDDDDDDDDD are 5 bytes in 10 ASCII HEX characters
> KK is a HEX checksum
> C is CR and L is LF and E is ETX.
> I guess the easiest packet format (this will probably be on a separate
> freq) would be:
> Where the SSID of the hotspot reader (I) can contains 4 bits of additional
> info such as direction, speed, etc.  The initial "R" will make this an
> ALTNET (non-APRS) packet if in some simple locations the RFID reports are on
> the APRS channel for simplicity.
> Are we missing anything?
> Bob, WB4APR
> ---- Original message ----
> >Date: Wed, 10 Feb 2010 11:54:12 -0500 (EST)
> >From: aprssig-bounces at tapr.org (on behalf of "Bob Bruninga " <
> bruninga at usna.edu>)
> >Subject: Re: [aprssig] APRS RFID apps? (Hot Spots!)
> >To: "TAPR APRS Mailing List" <aprssig at tapr.org>
> >
> >In/OUT Hot Spots:
> >
> >And if we wanted to, we could have two hot spots at each door.  One
> labeled APRS IN and the other APRS-OUT!
> >
> >Here is  the design of the hot-spot processor:
> >
> >1) The hot spot has its own 6 letter/digit call.
> >2) It encodes the passing RFID into the TOCALL of a packet
> >3) The transmission then is extremely short.
> >4) A central PC somewhere has a keyboard to let people enter their
> callsign.  Probably at the point-of-sale of the RFID card for $2.  This PC:
> >  A) asks for the callsign of the person holding the card
> >  B) Builds the file of all associations
> >  C) Has the exact location of the RFID readers
> >  D) Hears the packets from the readers, makes the association and then IT
> originates the APRS packet for that callsign at that location onto the APRS
> channel.
> >
> >We may as well put the RFID readers on their own frequency to avoid
> congestion in getting the passing tag info to the central reader.
> >
> >  E) The file of RFID/callsign associations is made available worldwide.
> >  F) Since the APRS packet that results from the RFID tag will be in a
> standard format, and will contain the RFID number too, and will appear
> eventually on the APRS-IS, then data bases worldwide in real-time can be
> gathering the associations as well.
> >
> >Wow, this can work, and will make a great club project!
> >
> >  G) For clubs that bring lots of folks to Dayton that have all brought
> their own RFID boots, one member of the club can bring a standard FILE of
> associations to the central PC and associate everyone at once!  And our club
> always maintins its own awning-lounge area in the flea market area and would
> bring its own HOT SPOT so that when some relaxes there, everyone else can
> know...
> >
> >Since I already developed a data-base last year that maps every fleamarket
> space to a lat/long position, someone placing a  hot spot would only need to
> enter its space number to configure it for operation...
> >  H) therefore there are two formats for the READER-to-central packet.
>  One needs no position, beacuse the hot spot is at a fixed location loded
> into the central PC.  But another format is needed for a frequently moving
> hot spot that would include its present position as well.
> >
> >  I) Soccre Ball RFID reader:  Shucks, you could put a GPS in the hot spot
> and put it in a soccer ball and let people kick it anywhere they want.  When
> their foot hits it, we record their position!  Tihs game for APRS users only
> of course...
> >
> >WOW
> >Bob, Wb4APR
> >
> >>APRS RFID Hot Spots!
> >>
> >>PROBLEM SOLVED!   I was pondering how we would possibly cover all the big
> doors at Dayton with APRS RFID readers and then it hit me.  We Don't have to
> cover the whole door.  And we only need one tiny coil...
> >>
> >>We just put it in a 1 squarefoot bright yellow MAT with APRS in red
> written on it.  It is an APRS hot spot.  If you want to be seen at that
> location, swing your foot over the spot... DONE!!!!
> >>
> >>What we were overlooking is that APRS hams are not passive players, they
> are active participants and will be happy to swing their foot over a known
> hot spot (or avoid it if they are not where they are supposed to be).
> >>
> >>This solvles ALL the logistics problems I can think of.  The big
> breakthrough was Patrick suggesting we put the cards in our shoe, now this
> final breakthrough solves the range and coverage problem completely.
> >>
> >>As to applications, I can think of nothing on earth better than Dayton.
>  The naysayers will say but what value is it...  And I say, because its fun
> to do!
> >>
> >>APRS Hot SPots at Dayton...  Those people with APRS booths could put one
> in front of their table... etc..  Or at entrances to the Forums... or
> anywhere that APRS people might congregate...
> >>
> >>Bob, WB4APR
> >>
> >>
> >>---- Original message ----
> >>>Date: Mon,  8 Feb 2010 00:24:37 -0500 (EST)
> >>>From: aprssig-bounces at tapr.org (on behalf of "Bob Bruninga " <
> bruninga at usna.edu>)
> >>>Subject: [aprssig] APRS RFID apps?
> >>>To: aprssig at tapr.org
> >>>
> >>>Now that we realize we can make APRS track anyone with a $2 credit card
> RFID in his boot, I have been wearing this credit card in my shoe for a week
> and can't even tell it is there any longer (after the first hour or so...)
> >>>
> >>>But what for?  I had some sample ideas, and figured once we figured out
> how to do it, an avalanche of other applications would pop up...  But after
> a week or so, I'm making little progress.  Here are the only apps I have
> come up with:
> >>>
> >>>1) At clubhouse door
> >>>2) at EOC door (city, county and state)
> >>>3) At local HAM store
> >>>4) At Dayton doors in each room
> >>>5) Just for fun with a mat in front of your fleamarket space to see who
> walks by?
> >>>
> >>>Of local ham events, I also don't see an immediate app.  The hams dont
> move much.  The event participants do.  And they are either in the thousands
> (runs) or out of reach... (or already have RFID (MARATHONS).
> >>>
> >>>Although a few of the dedicated volunteers that show up at all EOC tests
> might consider it, I cant see getting more than a yawn from the rest of a
> club...
> >>>
> >>>Any other knock-em-dead apps I'm missing?
> >>>
> >>>Bob, WB4APR
> >>>
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> >>
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God help those who do not help themselves.
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