So I know what i'm doing is over kill. i have always preferred building something bulkery and with more options than i need right now. and yeah i wish to just turn the fan on and off it doesn't have a variable speed motor well it does but the low speed winedings are toast. I have some relays (no clu...

It's a little vague with the details... If it specified a minimum trigger voltage for the relays, I'd be happier with it. Here's an old forum post with a discussion on the boards, where one person got one that couldn't be triggered by the 3.3V outputs of the Pi: https://www.raspberrypi.org/forums/v...

The DHT11 will work fine, as long as you can keep it somewhere where it won't be soaked in water (which may be a struggle if you plan on misting everything). As for the rest of it, check out relay boards with opto-couplers, like this one: http://www.ebay.com/itm/8-Channel-5V-Solid-State-Relay-Shiel...

So i'm attempting to automate my green house but i'm not sure how. I'm fairly competent when it comes to programming but my issue is I don't know what hardware I will need for this project. I've searched quite a bit but just ended up more confused. To give you an idea of what I need here is a list o...