[hornychz]

Werk mentions that calculating the correct values of those 2 resistors and the 2 on the TX is important for long wires indeed

That is the question, if he only wants to bother us?

[werk_ag]

That is the question, if he only wants to bother us?

My dear friend, I liked that!
I have just followed what is said in the P82B715 datasheet.

...

2) this more important for me: when I study P82B715 datasheet to manage the Rx values, I found Fig. 9 in the chapter 8.2 = Quick design-in point-to-point/multi-point information for 5 V bus. They recommend to put resistance 4.7kOhm on each I2C-bus (SDA and SCL) and on each end of the cable resistance 470Ohm (buffered bus, LSDA, LSCL). It would be satisfactory up to long 30 or maybe 50m of UTP cable Cat5e. Do you agree, please, with this idea?

...

My installation will have 8 m of outdoor UTP Cat5e cable ...

Regards

Yes, I agree! According to the datasheet, the pull-up resistors at both sides of the SDA and SCL bus, should be calculated according to cable length and type.

In your case, with a UTP cable of just 8 meters it's possible that it will work just with the default 4.7K resistors already installed on the TX unit (R9 and R10) and without the corresponding R1 and R2 resistors on the Soil / Leaf interface (mine is working that way with 5 meters of UTP cable).

The reason why on the Soil / Leaf interface the R1 and R2 resistors are the only through the hole parts, is exactly to allow the user to install the resistors with the value that best fit their needs in function to cable length we want to use.

[hornychz]

Hi, friends,

Finally lives even my soil/leaf interface. At this moment only width 3 soil temp sensors, the VH400 is on its way from Germany to me. My sensors are -0.05m, -0.5m and -1m:



Interface:



Sensors:



Connecting to TX2:



Thank you for your help.
Regards

[werk_ag]

Hello Zdenek,
As usual, a very professional assemblage. It's a pleasure see this pictures. Thank you for sharing.

Regards
Werk_AG

[zitoune]

Looks very neat and pro Zdenek - I need a big garden now!

Any reason why you put this cubic structure around? Is it more acting like a protection?

Regards.

[hornychz]

Looks very neat and pro Zdenek - I need a big garden now!
Any reason why you put this cubic structure around? Is it more acting like a protection?

Yes, it is a bit of a barrier to our grandchildren ...
And a much larger garden would also be needed!

Regards

[hornychz]

As usual, a very professional assemblage. It's a pleasure see this pictures. Thank you for sharing.

You are a very kind person, Werk_AG!

Regards

[hornychz]

Hello everybody,

I'm solving one problem, but I can not find a solution. Maybe you give me some advice?

I'd like to have values of soil temperature and soil moisture in one raw at:
1) Wireless Display of WeatherDuino
2) local web of CumulusMX server
3) CumulusMX web (meteo.brandysnl.cz)
and simultaneously sent to a network Weather Underground soil temperature 1 meter deep and soil moisture 5 cm deep ...

I thought that would be enough to write a configuration parameter Cumulus.ini:
SendSoilMoisture3=1
But it does not work, WU then shows the dashes. And if I change it to:
SendSoilMoisture1=3
shows only 0.0

Here is my RX configuration:


Configuration for CumulusMX local web:

and this is result:



Configuration for WU:

and bad result:


When I use moisture sensor mapping for S1={2,0} and WU parametr SendSoilMoisture1=1, WU web is good, but for example WD shows moisture in -5cm in the raw for temperature -1m

Is this going to solve without complete rewiring all sensors?
Thank you for each answer ...
Regards

[hornychz]

Hi all,

so I "solved" it ...

Because I have two RX units, one of them has mapping soil moisture S1={2,0} - and this is for Weather Underground and my web, and the second unit has S3={2,0} - and it is for Wireless Display:







I am convinced that there is a bug in the CumulusMX in this version 3041.
Cumulus.ini - Cumulus WiKi

Regards

[werk_ag]

Hi Zdenek,

Maybe it isn't bug, maybe Steve haven't implemented yet in CumulusMX the possibility to select which soil sensor outputs to Wunderground.