ChartMaker extension

[lenoyl]

Hi,

I trying to do a simple graph using the Chartmaker extension, but something is wrong as I get the following message:

I get some data (temperature and humidity) from a DHT11 through a BLE: It is sent with a ";" separator that allow me to split it in two (first I remove the [ and ]). I manage to display the values in some label zone (label7 and label8) and event do some mathematics in it.
For now I m just looking to X-plot the 2 values (yes it is stupid ... -> the plan is to add an time ID value latter and to append the just received list to the old one to get more than 1 couple of value and have a small historic )

here the part where all is setup:

I m pretty sure it is a stupid thing (I hope so!), but cannot figure out.
here a topic that helped me a bit
(https://groups.google.com/g/mitappinventortest/c/S3tw7gSGE8A/m/D8DFWJQrBAAJ?pli=1)

by advance thx for your help!

[TIMAI2]

Assuming that everything works OK up to the point you introduce the Chartmaker block.....

What does your global BT_received_data look like ?

It should be a 2D array / list of pairs e.g.

1,37
2,45
3,41
4,38
5,43

[lenoyl]

.. maybe when I m splitting the list it is creating 1 column with 2 rows? (while I m rather expecting 2 column with 1 row?)

[lenoyl]

Hi Timai2,
thx for your reply,
At the beginning of the process it got something like [24;65], and after bracket removal and split I guess it is more likely to look like this?... (but I m not sure )
24
65

How to split the text in a way that it is not in row but rather in column? or maybe I do not split, but I replace the ";" by a "," simply?
Sorry, looks surely stupid, but I m not so familiar (yet) with the list ...

[TIMAI2]

Please share an example of your raw stringValues.
( I am surprised it is a list as it is.....)
Your text manipulation probably needs an "\n" in it somewhere

[lenoyl]

this is how it is send from the arduino :

the arduino is using a println -> /n

this is how I got it on the app if I just put what I got in a label ["24.00;63.00"]

[lenoyl]

in the mean time following the row/ column mix up idea I had a try by replacing the ";" by a "," and not doing a split ... but got this error:

the modified code:

[TIMAI2]

What is in here?:

[lenoyl]

the row data send by the arduino ...if I look at it using the following code

I got: ["24.00;63.00"]

[TIMAI2]

OK, this is a list with one item: "24.00;63.00"

Now I am guessing that one of the values is temperature and one is humidity, and that you only want to show the temperature, and that this will only place the one value?

[lenoyl]

yes it is a list with one item:
how to split it so it will be 2 items but in column like this
24.00(in column A) 63.00 (in column B)
and not in row, all in column A (as the text split is doing)
24.00
63.00

for now I m just trying to Xplot those 2 values (expecting that if I manage to do that I will be able to do it latter with the time in X-ordinate)

[TIMAI2]

This is how you need to present your data to the Chartmaker:

and for several values:

and to chart your two single values:

[lenoyl]

ok, I will try, I guess that is also the method to create a list with 2 columns right?

By the way why there is a 1 there

.... or it is rather creating 3 columns with data set temperature and humidity so the one will be replaced by the hour or any counting index, i m right?

[TIMAI2]

@lenoyl

.... or it is rather creating 3 columns with data set temperature and humidity so the one will be replaced by the hour or any counting index, i m right?

Yes

[lenoyl]

.. maybe I did a mistake but I still get the error: it like if it doens t do the split anymore...

here the code I put in (should be similar to yours ... )

[TIMAI2]

If your stringValues is indeed a list:

then you won't need to do all that string manipulation, just attach the get stringValues block to each of the select list item blocks in the chartMaker block

[lenoyl]

well doesn't work either

[TIMAI2]

run Do It on "is a list thing".....stringValues

[lenoyl]

yep I tried that is what it give me when I Do it on "is a list thing..."

[lenoyl]

even when I 'do it' on my original code that is well working (e;g; return the 2 individual temperature/humidity values, each into a label ... ) . below the code that is working without problem: