TempSensor and DataCorrection

Emoncms
1

I have a temp sensor on my DataLogger (WebControl Server). I allready pushed successfully the data to my local raspi emoncms installation, but the data needs to be corrected by a slope (multiplier) 0,0929 and an Offset of -30.7793.
How can i do this as the importer just takes the value given by the WebControl Server.
So to get correct temp shown i need to multiply with 0.0929 and -30.7793 :slight_smile: Thnx for you help
Alex

I found now the ProstProcessing, but this is not working for formula as it allways shows an error (f8 is the correct feed id).
{“formula”:“((f8*0.0929)-30.7793)”,“output”:20,“process”:“basic_formula”}
STOPPING could not understand your formula SORRY…

2

Hi Alexander,

You can do this via input processing, before you log the corrected value to a feed. This is done via the ‘inputs’ page, through the wrench icon. Please see my screenshot for an example;

Screenshot 2022-08-28 at 20.46.21
Screenshot 2022-08-28 at 20.46.212116×376 76 KB

3

Just take care of the order. Do you need to do the offset first, or the multiplier first?

4

thnx for the hint. multiplier firs

6

works perfect !
one question left - when adjusting the input in this way i got two feeds.
one with the original value and one with the temp.
will this first still be needed ?

7

If you need it, keep it, if you don’t, don’t log at that point in the processing and then delete the Feed.