[aprssig] Weather station update
scott at opentrac.org
Mon Nov 9 13:20:27 EST 2009
A quick update on my weather station project... it's coming along well,
and I should have the first units shipping in time for Christmas. The
pictures here show what should be pretty much the final hardware version:
The wind/rain sensor installation is temporary in this picture and I
haven't secured the cables yet. The kit comes with cable ties for that.
The box contains temperature, barometric pressure, and humidity sensors.
There's a 1/2" port on the left side, covered with a stainless steel
mesh, that you can't see in the picture.
This board revision includes 2 megabytes of flash memory. At the moment
it's only used for voice sample storage (it has a vocabulary of a little
over 200 words for reading weather conditions over the air) but
eventually it'll be usable for data logging, too.
It's got a solid state relay rated at 8 amps for controlling radio
power. In the pictured setup it's powering an old Alinco DJ-F1T and
it's working great. It's drawing about 18 mA, but I should be able to
cut that by 50% or more as I get some software power save options going.
At this point there's mostly just software work and component sourcing
to be done. Those 3.5mm pluggable terminal blocks cost $16 each at
Digi-Key and they've been the biggest headache so far, but I've found a
source at a fraction of that and they'll be on the way here tomorrow. A
bunch of the voice samples have to be re-recorded (thankfully it's not
my voice in the production version) but that shouldn't take long.
Retail price should be around $150 (assembled except for the wind/rain
mast) with all of the sensors.
I'll be documenting a demo installation in the coming week, with a
complete solar powered station in an ammo can.
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