11-18-2024, 05:41 AM
after analyzing the pcb board I thought so too. However I checked and it seems to me that the GPIO12 pin (pin14) is free, it can be configured as an input and used normally in Arduino (tested). Maybe I'm wrong, but the diagram shows that it is not connected. One Pin for two PCF would be enough - the solution with interrupts allows for the certainty of reading each signal from the 16 digital inputs - without interruption there is a risk that some signal will be omitted.