Hello guys, 

I'm here to thank everyone for their help,
and George for sending the plaque, everything is working perfectly.
It took a while to get it up and running.  
Setup : 
CG4 Mount, 2 Nema 17 engines, onstep stm32 bluepill , version 3,16.  2 dvr8825.
I take this opportunity to post a small record made with the setup. 
Canon 70D, mod.  20 frames of 120", iso 800.
Cat's paw nebula.

Jorge oliveira