ESP8266 based. Uno form factor. $6!!
Now along with something like this for $4 …
You can have an OpenSprinkler killer for $10 instead of $155!!!
Still my old BlackWidow is fine for my home use but I have a backlog of family and friends wanting a wireless sprinkler controller. Just takes a pickoff of the 12volt AC used to drive the sprinkler valves to create the voltages for the board. A rectifier and few capacitors into a voltage regulator et cetera.
Goodbuy OpenSprinkler *sniff* so sad to see you go.