@Ljiddou, this optical sensor looks really cool!
Just curious, what type of controller did you have before the Iro?
The Iro is designed to take rain sensor inputs and interrupt the common to prevent the Iro from running. It will not change the schedule.
I think the sensor is working as it's suppose to with the Iro. I'd need to understand how your old controller worked with the optical sensor to reschedule watering times...
Happy to investigate but not promises we can replicate.
Hope this helps.