Library errors when compiling

I have used an example ArduinoOnOffTest from library Adafruit_TFTLCD.
When I compile it I get the following errors:

WARNING: Category ‘’ in library OneWire is not valid. Setting to ‘Uncategorized’
In file included from C:\Users\user\Documents\Arduino\libraries\Adafruit-ST7735-Library-master/Adafruit_ST7735.h:4:0,

from C:\Users\user\Documents\Arduino\libraries\Adafruit-ST7735-Library-master\examples\displayOnOffTest\displayOnOffTest.ino:15:

C:\Users\user\Documents\Arduino\libraries\Adafruit-ST7735-Library-master/Adafruit_ST77xx.h:31:29: fatal error: Adafruit_SPITFT.h: No such file or directory

#include <Adafruit_SPITFT.h>

^

compilation terminated.

exit status 1
Error compiling for board Arduino/Genuino Uno.

Is there an obvious reason why I get these compilation errors?

When you see a "No such file or directory" error it almost always means you need to install the library that contains the missing file.

Often the code you're compiling will come with documentation (either a comment or separate document) that tells you where to get the library dependencies.

In other cases the author of the code will not have been so kind and you'll need to go on a hunt for the missing library.

A good place to start is the Arduino IDE's Library Manager:

  • Sketch > Include Library > Manage Libraries...
  • In the "Filter your search..." box, type some keywords you have gleaned from the missing file name.
  • Scroll through the results for the right library. Click on it.
  • Click "Install".
  • Wait for installation to finish.
  • Click "Close".
  • Try compiling your code again.

If you have no luck in Library Manager then load up your favorite search engine and do a search for the missing filename. You will often get multiple results. If you have a lot of results you might add "arduino" as an additional search keyword. I will usually prefer results on github.com since that is where most Arduino libraries are hosted and downloading from there is fast and easy. In some cases there will be multiple libraries that contain the given filename and you'll need to do some evaluation to determine which seems the most appropriate, then try it out. After downloading the library you found you'll need to install it. This requires a different process than the Library Manager installation. You will find instructions here:

Thanks pert.

Something must have gone wrong with my downloads and importing the required libraries to the Arduino IDE so I deleted all imports and started again using Adafruit and Github downloads and it all came good.

Are there any examples of using GFX techniques with a UNO and a el-cheapo eBay 1.8 inch TFT?

I have used this combination together with level changes to successfully display numbers and text as per the example below.