OK, do you know if your relay board is active high or active low logic? In other words, to activate the relay do you set its pin high or low? The reason I am asking is that I know there are many relay boards that are active low logic, in which case you will need to reverse the logic when calling digitalWrite on these pins.
When you said ‘all the relays of the relay board are partial activated (a low light led but the relay don’t active) before to start Opensprinkler….’, do you mean the 3 relays connected to OpenSprinkler, or other, unused relays (i.e. not connected to OpenSprinkler)?