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[wxsig] APRS Transmission of Battery Voltage?

Will Beals will at beals5.com
Mon May 8 03:05:05 UTC 2006


There are no official designators for voltages, so I do put that data into a
debug string at the end of a regular message.  If you go to
http://www.beals5.com/wx and select the project status page, down at the
bottom are definitions of the debug screens.  It is straight binary data
expressed as two character ASCII characters.  The first byte is the message
type and then the following bytes are the message contents.  The one you
care about is message type 01 which is the error counters and two bus

I send the data once an hour rather than for every packet to keep network
bandwidth low.  Message types 02 and 03 should be rare as they are reporting
some internal data values if the computed humidity or wind speed seem


-----Original Message-----
From: wxsig-bounces at lists.tapr.org [mailto:wxsig-bounces at lists.tapr.org] On
Behalf Of M PATTON
Sent: Sunday, May 07, 2006 7:17 PM
To: wxsig at lists.tapr.org
Subject: [wxsig] APRS Transmission of Battery Voltage?

Hi all,

The T-238  the status display shows the battery and bus voltages.
Looking at the APRS string, I don't see where this data is transmitted.
Is there a way to enable the transmission of the battery voltage on
APRS?   For a remote solar operated station, this would be very useful
information to help know the status of the batteries.  It doesn't need to be
transmitted every packet but once every 3rd packet (15 minutes) would be

I see some data at the end of the APRS string after the "1w"- would this be
the telemetry data I'm looking for in a binary format?

BTW - I was able to get the current consumption down to ~45ma by removing
the display and the MAX 232.  I found out that the display needs the MAX232
plugged in or it won't work.  Next I will be trying a switching regulator in
place of the 7805 to see if that reduces it any further.  I'll let you know
how this comes out!

Mark - KØYG

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