The possiblites are endless with this (fermentation control, hot liquor tank control, brew kettle control, mash tun, or all of the above).
The full tutorial can be viewed here - http://fermentationriot.com/arduinopid.php Hope it is useful to someone...

Also I definitely do not consider myself an arduino or HTML/PHP coding expert...so any suggestions are definitely appreciated!
Happy Brewing to All!

