<![CDATA[How to display a float number via bluetooth]]>Good evening
I have only recently started using GUI-O and have not yet been able to understand how I can display a simple float variable on the display if a bluetooth connection is used. Is there perhaps a good example in this forum that explains my problem?
Thank you very much for your support.
Regards Fehr

]]>https://forum.gui-o.com/topic/225/how-to-display-a-float-number-via-bluetoothRSS for NodeSat, 14 Mar 2026 23:58:50 GMTSun, 27 Oct 2024 16:04:20 GMT60<![CDATA[Reply to How to display a float number via bluetooth on Wed, 30 Oct 2024 20:55:20 GMT]]>@Fehr No problem!

I plan to write a FAQ page on GUI-O website, which will also include this explanation.

Best regards,
Kl3m3n

]]>https://forum.gui-o.com/post/916https://forum.gui-o.com/post/916Wed, 30 Oct 2024 20:55:20 GMT<![CDATA[Reply to How to display a float number via bluetooth on Wed, 30 Oct 2024 09:47:18 GMT]]>@kl3m3n
Thank you very much for your support.
To use a string instead of a char array is even easier 🙂

]]>https://forum.gui-o.com/post/915https://forum.gui-o.com/post/915Wed, 30 Oct 2024 09:47:18 GMT<![CDATA[Reply to How to display a float number via bluetooth on Tue, 29 Oct 2024 06:55:02 GMT]]>@Fehr Hi.

The easier way is to fist create a label (like @Bernard suggested):

"|LB UID:my_label X:50 Y:50"

Then just modify its TXT property:

@my_label TXT:\"<value>\"\r\n

If you don't want to use snprintf, you can just use + operator:

String str = "@my_label TXT:" + "\"" + String(val) + + "\"" + "\n\r";

You can simply create a function to avoid repeating this command with different TXT values.

P. S. Similar topic:
https://forum.gui-o.com/post/116

Best regards,
Kl3m3n

]]>https://forum.gui-o.com/post/911https://forum.gui-o.com/post/911Tue, 29 Oct 2024 06:55:02 GMT<![CDATA[Reply to How to display a float number via bluetooth on Mon, 28 Oct 2024 20:20:47 GMT]]>@Fehr

with an update function that retrieves the entire string that needs to be sent, I finally managed to transfer the desired number to the GUI display.

f0570429-717f-4554-a5d9-d8f0a8ede516-image.png

The following string is displayed on the Arduino console:

bb3d0bbc-b64c-4bc2-a93b-6b81142ead68-image.png

And the desired numbers values are now finally visible in the GUI:

9b5e94ed-a49b-428c-9ee1-da5759de2777-image.png

Basically, it works. However, my question now is is there no easier way to achieve the same result? Thank you very much for your feedback and regards.
Fehr

]]>https://forum.gui-o.com/post/909https://forum.gui-o.com/post/909Mon, 28 Oct 2024 20:20:47 GMT<![CDATA[Reply to How to display a float number via bluetooth on Mon, 28 Oct 2024 19:38:26 GMT]]>@kl3m3n said in How to display a float number via bluetooth:

Hi kl3m3n, thank you very much for the quick reply.

Unfortunately, my char array variable is still not output correctly in the following example. I am currently using an ESP32 as test hardware.

571ba2f2-dd9e-404f-8a7f-6d6c0682d926-image.png

I can now generate a correct string with the snprintf function. This is confirmed by the following console output.

ba9c6102-f598-41ce-a1f4-58f4f075eec9-image.png

In the GUI display, however, the variable name is still displayed instead of the content of the char array. This is actually my general question, how do I have to pass the content of a string variable (char array) correctly so that I get the same output in the GUI as on the console?

f3488234-5e8d-4cb9-95f1-95362e141b02-image.png

Thank you very much for your support.
Regards Fehr

]]>https://forum.gui-o.com/post/908https://forum.gui-o.com/post/908Mon, 28 Oct 2024 19:38:26 GMT<![CDATA[Reply to How to display a float number via bluetooth on Sun, 27 Oct 2024 21:59:57 GMT]]>Good morning,
In the initialization script, simply define a Label:
|LB UID:your_label X:95 Y:96 W:20 FGC:#fb0001 FSZ:5 FFA:'font8' TXT:'0000'".
and write from your program In this Label "your_label " in the form of a string.
I don't know in C but with Bascom:
Dim Float as single //float variable
Float=3,414 // Float value
Dim Value as string *10 // declare Value as string
Value=Str(Float) // convert in string
Print "@your_label TXT:" ; Value ; " // print in your_label
and there you have it!
It works via Bluetooth or Wifi, it doesn't matter.
Bernard

]]>https://forum.gui-o.com/post/907https://forum.gui-o.com/post/907Sun, 27 Oct 2024 21:59:57 GMT<![CDATA[Reply to How to display a float number via bluetooth on Sun, 27 Oct 2024 21:50:12 GMT]]>@Fehr
Hi!

Glad to have you on-board the GUI-O enthusiasts! 🙂

You can use a label widget for displaying any kind of text/numeric values.

After connecting over Bluetooth, you can create a label by sending a string:

"|LB UID:my_label X:50 Y:50 TXT:\"<your float as string>\"\r\n"

The \ before the double quotes is an escape sequence, so that double quotes are properly interpreted within the command.

You can build this command by using "snprintf" on a char buffer (this is a c/c++ language standard library function).

You can check out the examples here:
https://www.gui-o.com/examples

Also, the manual describes the label (and other widgets) in more detail. You can download tge manual cia the GUI-O app or from GUI-O website.

If you need any additional information or help, feel free to ask.

Best regards,
Kl3m3n

]]>https://forum.gui-o.com/post/906https://forum.gui-o.com/post/906Sun, 27 Oct 2024 21:50:12 GMT