In this video, we’ll show you a simple project where we connect a hobby R/C servo to a small water pump, and control both from the USB NerdKit. Using input from the connected computer, you can aim, and fire a stream of water. The video also introduces topics like Pulse Width Modulation (PWM), including how hobby servos share a common protocol (1.0 to 2.0ms pulses), and how to use the ATmega168 to generate these pulses. Perhaps you can add another servo, and use this to water your plants?
When I saw this, I said, “Nick (Aleja’s beau) NEEEDS one of these!” I wonder if I Can find someone to make one up. And it is Mac compatible!