Meteostick air pressure: Spikes, normalizeing

[CFJH]

Hello,

I'm running a meteostick to read the VP2 since 2017. It is read out from a Linux server with plain shell scripts.
Now, I,ve time to make some software for visualizing. But here I've currently two problems:

1. I've sporadic spikes in the pressure, see attached image LD001.png. The problem exists since 2007, but noticed only yet. The stick is connected with a 1m USB cable to the computer (was shipped with the stick). I've tried different positions and putting some ferrite cores on the USB-cable near the stick.
1.1 The firmware of the stick is 2.3b1. If a firmware update solves the problem, how can I do it (on a plain (opensuse) Linux system) ?

2. How can I normalize the pressure to NN. Currently I add an constant offset of 5.25 to the values (height is approx 60 meters). But this is not exactly correct, one time, the pressure is a little bit too high, at other time to low (see LD002.png).




Jürgen

[CFJH]

No one has an idea or can give me a tip?

Jürgen

[admin]

Is the stick in a room that has pressure variations (reminds me to blower door test, etc)?

[CFJH]

Hello,
the stick is in my normal study. Unless I open the door, there should be no pressure fluctuations. I also tried different locations for the stick again (which are accessible with the 1m long connection cable), no changes. The spikes are looking for in the night when nobody is in the room.

The firmware on the stick is version 2.3b1, so older. Could an update solve the problem? But my worry is, if this goes wrong and the stick doesn't work anymore.

Enclosed a current history graphic.

Jürgen

[CFJH]

Hallo,

Now I've done a firmware update to the MS. But the spikes already persists.

But: I load'ed the firmware here from from the meteostick page:

http://www.smartbedded.com/files/meteostick.hex

The firmware is now 2.2, before it was 2.3b1

Is the firmware link out of date ?

Jürgen

[CFJH]

No Idea's
No link to an actual firmware for the stick ?
What version number has the actual firmware ?

[admin]

2.5.3 is the most recent one. Link has just been updated.