user6834: I'm trying to start with the SainSmart 4x20 serial LCD, and copied the library to the Arduino library:

So LiquidCrystal_I2C.h is included. But when I try to compile an example sketch it says 

Arduino: 1.7.0 (Windows 7), Board: "Arduino Uno"
HelloWorld_i2c.pde:2:31: fatal error: LiquidCrystal_I2C.h: No such file or directory
compilation terminated.
Error compiling.

Any ideas how to fix this?

user6834: I copied the SainSmart library to the IDE's library folder, not noticing that there was already a folder named "LiquidCrystal". Apparently the files added to the existing folder are being ignored.  
Renaming the SainSmart library before adding it solves the problem.

6834: <p>I'm trying to start with the SainSmart 4x20 serial LCD, and copied the library to the Arduino library:</p>

<p><img src="https://i.stack.imgur.com/QLGNM.png" alt="enter image description here"></p>

<p>So <code>LiquidCrystal_I2C.h</code> is included. But when I try to compile an example sketch it says </p>

<blockquote>
  <p>Arduino: 1.7.0 (Windows 7), Board: "Arduino Uno"</p>
  
  <p>HelloWorld_i2c.pde:2:31: fatal error: LiquidCrystal_I2C.h: No such file or directory</p>
  
  <p>compilation terminated.</p>
  
  <p>Error compiling.</p>
</blockquote>

<p>Any ideas how to fix this?</p>
 6834: <p>I copied the SainSmart library to the IDE's library folder, not noticing that there was already a folder named "LiquidCrystal". Apparently the files added to the existing folder are being ignored.  </p>

<p>Renaming the SainSmart library before adding it solves the problem.</p>
