Hi, I'm new in Arduino world. Maybe this will be some stupid question but anyhow. What is wrong with my code?
If I enable Serial.begin(9600) in Setup, application stop working, in opposite, I could use Serial, but then I should comment "prikazi_stevilke(desetice,enice);" in loop.
Any logic explanation? 
strandtest.ino (19 KB)
You're almost certainly using too much RAM.
Get those tables into flash memory.
thx ....problem solved, i put some tables in eeprom and now is OK.
but, I'm surprised....during programming it was written 11k used out of 30k...and i thought that this is OK.
I need to read spreadsheet more in detail 8) :* :* :*
thx
during programming it was written 11k used out of 30k
That refers to program memory (flash memory).
The Nano has only 2K of SRAM memory.