Interrupts and analog inputs

[kennethlimcp]

Something like a Parallel In Serial Out register would help you save on the pins

@rickpbush

However, they are a bit sparce on pins so I have had to rethink a control panel I originally designed for use on an Arduino Mega.

0.5V will not trigger the interrupt since it's almost like 0. What you can do is to read the analog value on A0 instead and set a threshold to recognize it as triggered.

@rickpbush

If I use pin A0 as my reader for my button array, will it trigger the interrupt if my array only produces say .5v?

Since you are interfacing buttons to the core, it's essential an INPUT and there's no issue with the pins only OUTPUTTING 3.3v. You won't need the pins to be outputting a voltage.

@rickpbush

I have not received my cores yet so can't test this out, it's more of a feasibilty study currently, I see the core only outputs 3.3v so if anyone can tell me if this will work I'd greatly appretiate it.