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[aprssig] APRS RFID apps? (spec rev4)

Robert Bruninga bruninga at usna.edu
Thu Feb 18 21:34:27 UTC 2010


> What was the total RFID cost?

RFID TAG           $ 2 each or so
RFID READER Module $25 or so
5v regulator       $ 2 or so
Battery            $ 2 or so
LED, resistor, cap $ 2 or so

That's about it!  And now all my photos are posted on the page:
www.aprs.org/aprs-rfid.html

Now we need someone to write tag-callsign association software
and we are GO!
Each club builds one or two HotSpots for their local use and
bring them to Dayton
For the big event!

Bob, WB4APR

> 
> -----Original Message-----
> From: "Robert Bruninga" <bruninga at usna.edu>
> Date: Thu, 18 Feb 2010 13:31:14 
> To: <bruninga at usna.edu>; 'TAPR APRS Mailing
List'<aprssig at tapr.org>
> Subject: Re: [aprssig] APRS RFID apps? (spec rev4)
> 
> RFID works!
> 
> I got my reader in the mail yesterday, wound a 4.75 inch 58
turn
> coil and get detections out to 8 inches.  Also found it easy
to
> tune the coil, by overwinding and then removing turns until
you
> get max range.
> 
> Photos of my completed unit in a few hours after the final
glue
> dries.  All it is is a coil, a 9v battery, and then postage
> stamp size reader module.. Then just two wires of 9600 baud
> RS232 back to the PC... Done!
> 
> But I have to revise the spec.  There is only one single
Serial
> data output per card and the card has to be removed and
> re-swiped to get a second reading, and the readings have to be
> at least 1 second apart.  Thus we cannot detect the three
states
> of the foot on the HotSpot (passing, stepping, and standing).
> I'm going to leave them in the spec in case we later figure
out
> a way to do it.
> 
> An interesting aside is that this makes a nice pocket scanner.
> Even without a PC.  The module has a LDE output.  So in
> something the size of a cigarette pack in your pocket you can
> "sniff" for RFID tags anywhere.  When the LED lights, it has
> seen a tag.  Hook up a beeper and you can get beeps!
> 
> Bob, WB4APR
> 
> > -----Original Message-----
> > From: aprssig-bounces at tapr.org 
> > [mailto:aprssig-bounces at tapr.org] On Behalf Of Robert
Bruninga
> > Sent: Friday, February 12, 2010 2:17 PM
> > To: 'TAPR APRS Mailing List'
> > Subject: Re: [aprssig] APRS RFID apps? (spec rev3)
> > 
> > I have updated the RFID web page:
> > http://aprs.org/aprs-rfid.html
> > 
> > Including a picture of a $4 door mat that I spray painted to
> > look like an APRS RFID HotSpot.
> > 
> > I also updated the spec slightly to use the !DAO! High
> > resolution format so that we can actually form the list of
> > people that enter a room to actually be listed in that room
> (if
> > you zoom in close enough).
> > 
> > I also made the on-air format into an Experimental packet so
> tht
> > it is compatible with all existing APRS..
> > 
> > Bob, WB4APR
> > 
> > 
> > _______________________________________________
> > aprssig mailing list
> > aprssig at tapr.org
> > https://www.tapr.org/cgi-bin/mailman/listinfo/aprssig
> > 
> 
> 
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