I currently use the Arduino Yun but am testing the Arduino Mega, Yun mini and Uno Wifi.
This is my brew setup,
With Solid State Relay
Download the Fritzing Diagram here, https://github.com/BrewBench/monitor
The Arduino Yún is now discontinued but you can use this replacement called Seeeduino Cloud
Just finished a waterproof prototype!
It's Back! Arduino Yún Rev 2 is set to be on sale April 23, 2018!