Scaling Generic Analog Inputs LoRa and LPP

LoRa
1

Good morning all
A quick question. I am using a Raspberry Pi sending data back via TTN and using LPP to encode the data as generic analogue inputs. For analogue values LPP can support values of -327.67 to + 327.67. Which is ok and understandable so a couple of quesitons…

  1. are the widgets for generic analog values scaled from -327 to +327 (eg the guage etc)
  2. is there the facility to rescale the widgets. For example if i am send a value between 0 and 100% can i rescale the guage?
  3. if I cannot rescale the widgets in order to get the highest resolution for analogue values it would seem best to map them from whatever they are to -327 → +327. is there a way in cayenne of doing arithmetic on the LPP values to scale them back to the original units?
  4. can i set arbitrary units for display of LoRa LPP analog types?

I know there is a lot there but I thought I would throw it out there so see what comes back.

thanks everyone

2

i am not sure what you meant by scale the value but the gauge can have values between -327 to 327. you can then set the range of the gauge to your need.

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3

Ok so when you set these range values they are not just for the color bars but range the graph as well. Ok good thing I see that now. What about values larger than 327?

4

Yes I just tried it I get that now. Thanks for explaining that.

5

i am not sure about the exact max value but it can go much higher then 327.

6

Ok thanks for this let me experiment. I did think the LPP spec said that was the limit but it may be that at 0.01 resolution. If that’s the case the the limit would be a signed 16 bit integer 32767 cool.

Thanks again

7

i referred to the gauge widget as a whole, if only for cayenne LPP then the limit is -327 to +327

8

Ok yes that makes sense.

Alan Ibbett

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