I do not understand what happens to me with the relay module-2 controlled by the PCF8575.
I think I have a correct connection and in fact the relay LED lights up if I program any timer or when I activate the pumps or the feeder, but the relays do not work.
For example, if I connect a bulb with timer-1 (pin P5) and program it from 20:00 to 20:15, the relay LED flashes during the interval but the bulb is always on.
It does not occur to me that I am doing wrong.
Greetings and thanks