@crispyoz Thanks.
Assume if I have to add few more sensors like 20 temp sensors, 20 buzzers, 20 buttons for each sensors, based on the temp value, there will be 20 different motors which will work as fan, buzz on different conditions, etc., In other words, is there any alternative if I need more than 18 (@tjoseph1 's answer) or I have to use a different Omega2.
As I am newbie to the pi world is there any video link to help me to understand better?
Once again, thanks for helping me, I appreciate your help.
Thanks,
-kv