Hello community,

I am using an ESP32 with a bluetooth connection to visualise data in a chart. I would like to reset the chart data at a certain point in time so that the chart starts visualising new data from the beginning. However, I have not yet managed to delete the old data. My initialisation of the chart looks like this:

sendMsg("|CH UID:Current_Chart X:50 Y:82.5 W:90 H:30 VIS:1 CHN:\"Current [A]\" YLO:0 YHI:40 FSZ:2 XMA:8 YMA:6\r\n");

Before the chart reset i continuously send the new measurements every second with the following command :

string str = "@Current_Chart YP:" + String(BatCurrent) + "\n\r";
sendMsg(str);

Does anyone have an idea how I can reset the chart so that the new data is plotted from the beginning again? Thank you in advance for your support and best regards.
Fehr

@kl3m3n
Thank you very much for your support.
To use a string instead of a char array is even easier

@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.

The following string is displayed on the Arduino console:

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

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

@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.

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

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?

Thank you very much for your support.
Regards Fehr

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