First of all thanks for answering so quickly.
It is like putting the images in the message. When stepping motor feed him with a 12v source. and noticed that the engine responds something, to play with their coils 12v directly. The scheme is the one in the link in the section where it says "using the driver". What I have is not the 100uF capacitor in the motor supply terminals.
Initializations terminals "sleep" and "reset" for I have put in place instead of directly to +5 v, inicializaras with arduino so you can "play" with the settings to see if it must be HIGH or LOW
Thanks again and I hope your answers.