Reject value of 0?

[Jens-Jørgen Kjærgaard]

I have added the temperature of my pond as extraTemp1 and using DS18B20 on the raspberry, runs fine.

Now I have also added the water level of the pond as extraTemp2 using ultrasound. Of course I get the reading as degree C when it should be in centimeters, but I don't mind - anyway, it works fine. 

But if I get a power outage, the extraTemp1 is just missing, as it should be, but extraTemp2 records a value of 0, producing a misleading graph. Is there any way to avoid this?

[Tom Keffer]

Hi, Jens

Best solution would be to solve the problem at its source. It sounds like the DS18B20 emits a zero, even though the power was off. Any way to change that?

Alternatively, you could tell StdQC to reject values outside a "known good" range:

[StdQC]
    [[MinMax]]
        extraTemp2 = 1.0, 1000.0

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[Jens-Jørgen Kjærgaard]

Thank you, Tom. 

I am using the HC-SR04 for the ultrasound measurement (and DS18B20 for temperature), and I haven't been able to find why it outputs zero on power outage.

I guess I have to use the StdQC option instead - though not so nice, as the value in fact may be zero sometimes (due to my "calculations" from cm to degree F).

Jens-Jørgen Kjærgaard

Tuenvej 818

9870 Sindal

+45 21204417
www.jensjk.dk

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