Arduino IDE doesn't find header file

Question

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?

Answer 1

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.

Answer 2

There is not enough info to give a specific answer so I will give some troubleshooting tips:

1. First make sure at the top of your code you have: #include <LiquidCrystal_I2C.h> - with angle brackets
2. You may also need the Wire header file: #include <Wire.h> - with angle brackets
3. Make sure you Include Serial
4. Make sure there are no extra folders in the library for example there should be a folder called liquidcrystal inside the liquidcrystal folder
5. If all fails copy the code from the header file make a new file in the IDE paste it in there and call it LiquidCrystal_I2C.h

Hope one of those solves your problem.

Answer 3

I just found a solution by myself...

You just need to replace the library folder by a new one...

In the error message it will show you which library is used and which not...

Just replace the used library to a new one...