6. Weather Station Operation
Connecting
to
a
Weather
Station
The
OpenTracker
can
be
used
with
the
1
‐
Wire
Weather
Instrument
from
AAG
Electronica,
the
Peet
Bros.
Ultimeter
II,
and
the
Peet
Bros.
Ultimeter
2000
series
weather
stations,
including
the
Ultimeter
800
and
2100.
In
Dallas/1
‐
Wire
mode,
the
microcontroller’s
PTB2
line
is
used
as
the
1
‐
wire
data
bus.
This
signal
is
available
at
pin
7
of
the
10
‐
pin
header.
A
pull
‐
up
resistor,
connected
to
the
5
‐
volt
supply,
is
required
for
the
1
‐
wire
bus
to
function
properly.
All
other
weather
stations
connect
to
the
serial
port.
Weather
Firmware
Setup
If
the
OpenTracker
has
the
weather
station
firmware
loaded,
the
configuration
program
will
detect
this
and
display
a
different
screen
on
startup.
Most
of
the
options
function
as
with
the
standard
tracker
firmware.
However,
the
weather
station
operates
only
in
fixed
position
mode
–
it
cannot
interface
with
a
GPS
receiver.
Also,
the
comment
text
is
always
sent
in
a
separate
packet
from
the
weather
data.
The
‘Wind
Vane
Adjust’
slider
is
used
to
calibrate
the
1
‐
wire
weather
station’s
wind
vane.
The
wind
vane
should
be
pointed
in
a
known
direction
and
the
slider
adjusted
until
the
direction
is
reported
properly.
Peet
Bros.
stations
should
be
configured
in
‘complete’
data
mode.
OpenTracker Manual - Version 1.05 – 6/25/06
page
15
of
23
