Hi,
@TomGeorge: i want to control independently how much each gate it's open.
No problem, use both sensors and counter, use sensors to set your counter each time the gate(s) is/are fully open or closed.
Tom.... 
Hi,
@TomGeorge: i want to control independently how much each gate it's open.
No problem, use both sensors and counter, use sensors to set your counter each time the gate(s) is/are fully open or closed.
Tom....