I want to read the source code of an arduino library that comes with the IDE. Specifically the GSM.h

I dont know the location of the standard libraries that come with the IDE.

I only know the location of the user installed libraries.

So where is the source code of GSM.h?

1 Answer 1


Ok, i found out the location. In Win 7, it is C:\Program Files (x86)\Arduino\libraries

  • 1
    Those are the standard libraries. If you want to add libraries, it's (I think) preferred to add them to the `My Documents\Arduino\libraries` folder.
    – Gerben
    Commented Jul 1, 2014 at 16:59
  • 1
    Definitely preferred. Otherwise you lose your user-installed libraries when you upgrade to the next version.
    – Nick Gammon
    Commented Jun 29, 2015 at 22:00

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