Get average or previous value?

[Jens-Jørgen Kjærgaard]

I have been a user for many years, and the software is usually running smoothly.

Some years back, I added the temperature of my lake as extraTemp1 - also fine.

Now, I also monitor the water level, by means of ultrasound, using the HC-SR04. I have added this as extraTemp2, and don't min it shows as C in the graphs.

I have a little problem with that sensor, though. Sometimes it will show a far off reading, which has to be ignored, ie if it is more than 2 cm off the previous reading.

But I can't figure out how to do that. Is there a way to store the previous reading and use that (temporarily) for comparison? Or the average of the readings up to that point?

Jens-Jørgen Kjærgaard

Tuenvej 818

9870 Sindal

Denmark

+45 21204417
www.jensjk.dk

[Thomas Keffer]

Hello, Jens

Unfortunately, no, the StdQC service can only detect out of bounds, not big changes or spikes. You would have to modify it, or write your own service to do that.

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[Messy Potamia]

To measure my lake elevation I use a MaxBotix ultrasonic range finder. In my python code, running on the Pi, which every 10 minutes takes a reading from the sensor and stores it in a static file on /dev/sda1, I do a simple QC check, comparing the previous reading and if the delta is unreasonable I set a data-invalid flag and the code leaves the previous reading for the weewx service to pickup. It's not perfect but prevents the kind of crazy spikes that comes from a bird or otter sitting under the sensor or other electronic artifact.

Phil