Reply To: Error Compiling for board EnviroDIY Mayfly 1284p

The unzipped folders go into your MyDocumenrs/Arduino/libraries folder.  Make sure they aren’t nested within a second ‘libraries’ folder within the first one.  What version of the IDE are you using?

A good way to check that your libraries are installed correctly is to look at the built-in examples.  In the ARduino IDE, go to the File dropdown menu, then select examples.  You should see the basic Arduino example, then some more complex ones, but keep scrolling to the bottom and you should see lots of other ones like Adafruit and ModularSensors and SDI12.  The sketch you’re trying to use should be included under the ModularSensors list.  If you don’t see it, then your libraries aren’t installed correctly.

If your libraries are correct, there should be more information in the error window that will tell you what is causing the problem.  If you still get the error, copy that full error message into your post.