I am fine, but a little tired
I am wondering how to say "I am fine, but a little tired", when someone asks "how are you". The machine translations used "'soy", so I know those were very wrong. I don't really know if using "pero" exactly like I would use "but" works in Spanish. Trying to keep it simple!!
Yes, in this case you can use "pero" just like "but" in English.
Estoy bien, pero un poquito cansado.
Estoy bien pero un poco de sueño, Sueño meaning that you are tired in a sleepy sort of way but if you are tired out because you have been working hard or such like then you would say cansado.