Arduino for Bath fan control

I’m new to this whole SmartThings and Arduino thing and was wondering before purchasing anything if it was possible to use an Arduino MEGA and a w5100, smart switches, and a couple of dht11 humidity sensors to turn on the Bath fan automatically when it gets too humid but not until the humidity inside was greater than the humidity outside. Could this be possible to do with Arduino and SmartThings?

Why would you need the Arduino if you’re going to have a smart switch?

You can prob make that work but the below hardware w/ core or webcore to handle the automation would be much easier.

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That looks like exactly what I’ve been looking for, thank you!

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