Reporting in pdf

I have a project where I serial communicate (MODBUS) with a device and after a few minutes must present the received data in a report form. I use a LCD screen so no problem.
But the customer asked to also save those reports, so I made some kind of log file on SD card.

But i was wondering is there a PDF driver/library available so i can directly make a pdf file on SD or write numbers/text into a existing pdf file? :slight_smile:

No.

Why do you want PDF format? A spreadsheet seems like it would be more appropriate for data. You can do that easily by formatting the data as CSV.