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[aprssig] Tiny Telemetry

Drew Baxter droobie at maine.rr.com
Tue Aug 31 14:40:35 UTC 2004


I have a 1-wire from AAG.  I have yet to use the thing but hopefully once 
my tower goes up (Which was delayed, but I do have 48 feet of Trylon T300 
sitting here, so it's gonna happen somehow).  I do think that it's probably 
one of the cheapest weather solutions though for APRS, so support would 
definitely be something of interest to someone, if not me in the 
not-so-distant future.  Remote weather stations don't need to be 
multi-hundred dollar Ultimeter or Dallas rigs.

Byon's device doesn't do 1-Wire but it supposedly will 'in a future 
version'.  I think that the only thing that does 1-Wire is the old TAPR 
kit.  I think that means there's no 1-wire converter for APRS, correct me 
if I'm wrong.

--Droo, K1XVM

At 10:13 AM 8/31/2004, scott at opentrac.org wrote:
>At the risk of restarting some old arguments on what's considered
>appropriate use of 144.39 and the APRS message formats, let me say that that
>sounds like a bad idea.
>
>The OpenTracker has 3 A/D inputs.  4 if you count the one used for energy
>detect on receive.  One's normally wired to a temperature sensor, another to
>the voltage divider, and the third is unused if you're not running in 1-wire
>weather mode.  Right now, it'll report temperature and/or voltage in the
>comment field.  I've had a couple of requests to add 4-20ma current loop
>support to the other input, which I haven't done mostly because I haven't
>got any sensors on hand to test it with.
>
>If I can get a clear description of what people would like to see in a
>telemetry encoder, I'll work on getting that ready in time for DCC.  I can't
>guarantee it'll be able to fit GPS support in the same firmware, but it'll
>at least work (like the weather version does) in fixed mode.
>
>The new surface mount version is pretty small, and you can get power
>consumption under 4ma @ 12v.  And it'll be a heck of a lot cheaper than a
>KPC-3.
>
>So, if there's a telemetry feature you want, let me know - e.g., 4-20ma,
>1-wire sensors, whatever.  I'll see what I can do.
>
>Scott
>N1VG
>
>-----Original Message-----
>From: aprssig-bounces at lists.tapr.org
>[mailto:aprssig-bounces at lists.tapr.org]On Behalf Of Robert Bruninga
>Sent: Tuesday, August 31, 2004 5:27 AM
>To: aprssig at lists.tapr.org
>Subject: [aprssig] Tiny Telemetry
>
>
>Need a small APRS gizmo for remote telemetry?
>
>The pocket tracker which combines a TinyTrak
>and a small 144.39 transmitter and a 9v battery
>into a shirt pocket device (fits in an Altoids can)
>is ideal.
>
>Of course, it only processes GPS data, but wait!
>
>For other purposes, remember that GPS data is
>just numbers and there is nothing that says it
>has to mean LAT/LONG.  So if you want to have
>a quick way to get a unique telemetry system on
>the air, just have your little project output a GPS
>NMEA string but let the 13 or more digits mean
>whatever you want.  THen decode them on the
>other end...
>
>Anyway, just a quick way to get some unique
>telemetry on the air in a small off-the-shelf package...
>
>de WB4APR, Bob
>
>
>
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