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

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how many sensors work @ time in arduino home automation?

hi,
you need more thinking this:

what kind of sensors?
what specific sensors?
some sensors use 1 i/o pin, use 4 or 5. (like ds18b20 temperature sensors can run 8 sensors on 1 pin).

what planning sense??

some overall info here.. google show 5289 more, more or less..


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