How many sensors will work at a time in an Arduino for Home automation?

How many sensors will work at a time in an Arduino for Home automation?

Hi,
You need to do some more thinking about this:

What KIND of sensors?
What specific Sensors?
Some sensors use 1 I/O pin, some use 4 or 5. Some (like DS18B20 temperature sensors can run 8 sensors on one pin).

What are you planning to sense??

Some overall info HERE.. but Google will show you 5289 more, more or less..