'F' was not declared in this scope

‘F’ was not declared in this scope

Ok, thanks for the heads-up

JimboZA: Ok, thanks for the heads-up

+1.

Use the newest Arduino IDE. Either version 1.0.5 or 1.5.7 BETA.
The ‘F()’ macro was not yet available in very old Arduino versions.
Or… maybe you use a library and have mixed up the includes. You might need to #include <Arduino.h> or #include “Arduino.h”