[wxsig] Fwd: [opentracker] Weather station update - 1 - Wire possibility

[Rich Beckwith]

Don't know if any of you are following the OpenTracker group, but
thought this very interesting.  Scott is working on a weather station
product/project. Should be a fairly capable device when he is done. He
is considering a 1-Wire interface for the instrument.

Rich


---------- Forwarded message ----------
From: Scott Miller <scott at opentrac.org>
Date: Fri, Aug 7, 2009 at 6:07 PM
Subject: [opentracker] Weather station update
To: opentracker at yahoogroups.com




The WX boards came in the other day, and I've got the first prototype
assembled.

After fighting with it all day, I've finally got the stupid barometric
pressure sensor working. It involves reading a bunch of calibration
constants from the device and doing some math, and I found two errors in
the example code given in the data sheet during my testing. After
finding the last error, it's now reading within 1 hPa of the barometer
on the wall, which is within its specified absolute accuracy.

So as of this afternoon, here's the status:

Wind speed - working, looks right, needs calibration
Wind direction - working, no consensus averaging yet
Rain - working, needs calibration
Temperature - OK
Pressure - OK
Humidity - OK

No show stoppers with the board layout yet. A couple of minor
silkscreen errors, and the board stop on one of the RJ12's interferes
with a boss on the lid, but nothing a pair of side cutters can't fix.

Scott