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!
I really enjoyed your project. Have you tried using the arduino uno with network card?
I would love to use your brewing automation ..
Sorry for writing mistakes, my language is Portuguese .. I'm from Brazil.