Open-Source Sprinkler Extension Board for BeagleBone Black by Ray’s Hobby and OpenSprinkler
https://www.youtube.com/shared?ci=JcNZJkttoLM
great! I have one of the earlier AVR based opensprinklers, and while it works well, I do often wish it was Linux based. Time for an upgrade in summer I think 
http://beagle.opensprinkler.com leads to https://opensprinkler.com/product/opensprinkler-beagle/ which says “Oops! That page can’t be found.” and the Products page at https://opensprinkler.com/products/ doesn’t list it either. https://opensprinkler.com/product/opensprinkler-pi/ for the Pi seems the closest, but it says “Enclosure is not tailored for the Raspberry Pi” which I think means that it’s the AVR-based enclosure.
@Ray_Wang can you bring back OpenSprinkler Beagle? Note that there is now a @SeeedStudio #BeagleBone Green Wireless that boots up as an access point and should make configuration really easy.