I have a question regarding the ARDuino uno and some shields. I currently have a shield on my Uno, which takes the pins 0 to 7. However, on top of that board there is an extension of those 8 pins. If they were always in use, I suppose that the extra ports wouldn't be on top of the board, right?
So it seems like you're able to "share" them. Is it possible to do so in real-time or is that there so you can use the ports when you disable the shield?
If its possible in real-time, how would I go about doing that? I've searched a little but couldn't find anything. I suppose i'd need some kind of clock to make the switch between the shield and the other components on pins 0-7, but not sure how to do that.
I'm kind of an electrics newbie, so hence the question might be a little silly :)