This is a listing for an open source BrewPi temperature controlled fermentation chamber that I built using a wine fridge, a raspberry pi, an arduino, a couple relays and 2 LEDs. It has heating pads inside and is able to maintain .1 degree accuracy of your fermenting wort, even when the fermentation is producing heat. There is a web interface that graphs both the wort temp and the chamber temp over time. It also displays when heating or cooling is active during that time. It has temperature scheduling and temperature ramping abilities, and can also save yeast/temp profiles for future use and repeatability. It can also save graphs of past brews.
This is an absolutely incredible killer tool for fermenting quality brews at home. You can brew lagers in the summer and hot saison yeasts in the winter.
It will require some technical skill to get it on your wifi and then get the IP address of it so you can access the web interface from a web browser on your computer or phone. Once it's up and running, the interface is very simple. You can google this as well. I followed the older thread on homebrewtalk.com to build it.
I can post/ send pictures, but it hasn't been used in a while and is pretty tucked away. This will take a special buyer so I'm going to hold off on digging it out until I hear from someone. Hopefully that's understandable. Sorry, but thank you.
I actually have 2 of them available if someone wants double barreled temp controlled fermentation stations :)