[aprssig] water level gauge for APRS

[Max Harper]

I would think the 100% humidity and condensation would kill a low end pressure sensor unless you could isolate it with a barrier of some sort, like a piece of thin rubber or silicone sheet. I also think it would take a little more electronics in between the sensor and a tracker to work correctly. 
A good friend of mine (now deceased) made one (non aprs) that worked very well, logging data to a pc for many years. Calibration was one of the hardest parts, setting the offset and gain so that it read as accurately as possible. I know he had to take multiple reading and average them to get accurate readings because the moving water caused the pressure to vary quite a bit. And how do you determine what the flood stage is for a body of water at a given point? I know that his software was very complex. It's not as easy as it sounds.
Max KG4PID
       From: Robert Bruninga via aprssig <aprssig at tapr.org>
 To: TAPR APRS Mailing List <aprssig at tapr.org> 
 Sent: Sunday, October 4, 2015 9:03 PM
 Subject: [aprssig] water level gauge for APRS
   
TO make a flood gage, it would seem that a simply pressure sensor like we use for atomosphere for balloon payloads would work.

Just put it inside a pipe with a cap on the top and open on the bottom.  Then the pressure will vary with the height of the water.  Connect this to the analog input of an APRS tracker and you have a flood gage.  Calibate it with some testing and done...

ANyone done this?

Bob

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