Another open source project from RaysHobby, the OpenSprinkler Bee (OSBee) shield:
OpenSprinkler Bee (OSBee) shield is an open-source Arduino shield for battery-operated (latching solenoid) sprinkler valves. It’s useful for gardening, lawn watering, flower and plant irrigation, and other watering applications. OSBee has a built-in boost converter and H-bridges to control up to four independent valves. The boosting voltage is software defined. The OSBee Arduino library provides easy-to-use software interface. Please check the video and user manual for instructions. Thanks!
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Check out the video after the break.