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

Bob Bruninga bruninga at usna.edu
Wed Feb 10 18:10:45 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?

Good idea.  But, we'd need and indoor range through several walls over half the distance of the indoors a Dayton, and in that RF environment, we'd need something a little longer range than a key fob.  You have any other XMTR's in mind?

I was thinking about a mircrotracker from Byonics or similar tracker type device from Argent Data Systems?

Bob, Wb4aPR

  Esp if there's a checksum
>   involved.
>    
>   Wes
>
>   On Wed, Feb 10, 2010 at 12:13, Bob Bruninga
>   <bruninga at usna.edu> wrote:
>
>     The RAW output from the RFID reader is:
>     SDDDDDDDDDDKKCLE
>     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:
>
>     SPOTID-I>RDDDDD-D:DDDD
>
>     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
>     >>>
>     >>>_______________________________________________
>     >>>aprssig mailing list
>     >>>aprssig at tapr.org
>     >>>https://www.tapr.org/cgi-bin/mailman/listinfo/aprssig
>     >>
>     >>_______________________________________________
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>     >
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>
>   --
>   Wes
>   ---
>   God help those who do not help themselves.
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