OpenSprinkler Forums Hardware Questions OpenSprinkler Pi (OSPi) Cannot turn Solenoid off Re: Re: Cannot turn Solenoid off



It’s recommended that the 24V AC transformer is rated 500mA or above. If you searched for ‘sprinkler transformer’ or ’24v ac transformer’ on Amazon, there should be some available choices. For example, this one on

As long as it’s AC transformer, it doesn’t matter which order you insert the wires — AC has no polarity.