why r u assuming that i didn't "google" my problem"s" first!! ... and i am not expecting the answer on a plate .... what am i expecting is what you would expect if u had a question and asked someone..... a 'direct answer' .... who told u that i don't know that the SSRs is much more expensive than an IRF504 mosfet (that's the one we will be using in fact)??! ..... my question was not about the drive.... it was about the arduino ....