found it . All stations should be “standard” so GPIO 12, corresponds to station 1, GPIO 13 corresponds to station 2 and so on.
I have in mine 8 stations 12,13,14,15,16,17,18,19 .
Finally tested the rain sensor and works ok , on GPIO 36, sensor 1
I am thinking of expanding to 16 stations (since there are plenty pins available)from your code and not sure how challenging would be so would like an advice.
regards,