Hi all.
I'm a total newbie... In fact, this is my first post.
I'm going through an arduino tutorial, and I've tested a few circuits already - my house is not burnt down yet 
I would like to combine several circuits into one, and use code on all of them. For example, I have a working termistor circuit, and also a buzzer circuit and a led circuit. Can I just combine and share pins between them? So if I wanted to buzz if we get to a certain temp, and then light up led if we get to another, can I just combine the circuits? Of course if both use an IO pin I would change that, but I'm referring to things like voltage, ground etc.
Thanks, and yeah.. I know... "welcome to the phorums"
AK