I haven’t modified my sketches to be compatible with Arduino release 1.0. According to the release notes here: http://arduino.cc/en/Main/ReleaseNotes a now built-in function F() can be used to store strings in flash memory rather than RAM.

Therefore on the line that says:

#define F 4

just replace “F” with another identifier (for instance FF) and replace every occurrence of “F” on the sketch by that new identifier.

That should do the trick. At some point I should go over the sketches on this blog and make these changes to avoid confusion.

sketch_jan25a:45: error: ‘F’ was not declared in this scope
sketch_jan25a.cpp: In function ‘void setup()’:
sketch_jan25a:57: error: ‘F’ was not declared in this scope

Seems to me that this line:
const int segs[7] = { 3, 2, 6, 8, 7, 4, 5 };

should be:
const char segs[7] = { A,B,C,D,E,F,G };

..works this way for me…

thanks for the code and the design!