Hello Fernando,
you can tell me if any of these PCF8575 is compatible with Ferduino?
1 - this PCF8575
PCF8575
or
2 - this PCF8575
PCF8575
If the two which one is easier to use?
as I know I am doing step by step.
What is the ULN2003A?
To have the PCF8575 also have to already have ULN2003A, or can I buy next?
Regard´s
NJPinheiro