Well...I've just re-programmed the coin acceptor and it works perfect!!I changed the pulses which are given from the coin acceptor, according to the value of each coin (1 pulse for 10 cents,2 pulses for 20 cents, 5 pulses for 50cents and 10 pulses for 1 euro)...and with that little change of the value from int to float it works right as i want!!!When i will finish my project, i will post my whole project and the code!!Thanks to everyone who read my post!! (despite that no-one posted smth). 