I am currently trying to train a AI to be able to understand Arduino code, sort of like ChatGPT, but offline. I need the Arduino Reference in a pdf format.
I understand that 15 years ago, it was included in the software, but now it isn't. Does anyone know of a pdf that does exist?
When the Arduino Language Reference was included in the IDE, it was not in .pdf format.
It was html, and was the same information that can now be found at www.arduino.cc/reference/en/
You could try downloading old versions of the IDE to see if you can find the information.
However, that post was eight years ago and for some reason the content of the PDF was even significantly outdated at the time of the post. So if you use that PDF then your AI will be using information that is a decade out of date.
Are you sure the system requires a PDF? That seems very odd. The current reference content is available in AsciiDoc format here:
You could try just feeding the .adoc files from the arduino/reference-en repository into it. They are text files, just with AsciiDoc markup. Even if the AI doesn't know the markup, it might still be able to be able to get enough from the text content in the files.
You could also use a tool like Asciidoctor to convert the .adoc files into PDF.