OpenSprinkler › Forums › Hardware Questions › OpenSprinkler Pi (OSPi) › Cheap Sprinkly Pi › Re: Re: Cheap Sprinkly Pi
May 7, 2013 at 3:03 pm
#23607
Ray
Keymaster
Yes, one wire from 24VAC transformer is the COM (common) wire, and the other wire should be tied to ground. AC transformer is no-polar, so it doesn’t matter which wire you pick as ground.
The code does not use RTC at all.