eng_osama:
Rasberry .. I see now .. so do you recommend me to change my order and buy an UNO ?
I would keep the Leonardo, they are good for prototyping. You can also use it (or the UNO for that matter) as a programmer to program standalone setups. So whenever you want to build a new project, rather than buying a whole new board, you can just buy the chip ($3-5) and program it on the breadboard. From there, you can put it on it's little board designed for the exact project. This signanficantly cheapens the use of Arduinos in permanent fixtures.