In the end, both the 8574 and the 8575 arrived, but I have problems with both:
PCF8575, I can't get any of them to work, I tried them with Arduino and neither, I think they are defective.
PCF8574, everything is fine but I can't get the reverse logic, it turns on all the LEDs and the one that irrigates turns off. active-low relay checked.
I think I will not be able to help you with the PCF8575.
Thank you Gerard
PCF8575, I can't get any of them to work, I tried them with Arduino and neither, I think they are defective.
PCF8574, everything is fine but I can't get the reverse logic, it turns on all the LEDs and the one that irrigates turns off. active-low relay checked.
I think I will not be able to help you with the PCF8575.
Thank you Gerard