To use Area mode, you first have to define the boundaries of the area. This is done in the app via a process similar to what I’ve encountered on some competing hardware devices. You fire up the mapping mode, and the sprinkler engages. Then, using a simple remote-control system, you dial the water pressure to the appropriate level, aiming at the edge of your yard but not the fence; once the water is where you want it, you drop a pin to mark the boundary of the watering area. You then rotate the nozzle on top of the sprinkler a few degrees and repeat, setting the strength of the flow to cover the desired area. Repeat again and again until you’ve gone through 360 degrees and have dropped pins to visually represent the entirety of your yard. The company says the maximum supported area is a vast 4,800 square feet, with spray reaching up to 39 feet.

ScreenshotAiper app via Chris Null

In the app, you can watch this area map being created in real time. The process is quite intuitive except for the final couple of points, where Aiper’s system makes it difficult to complete the 360-degree circuit. If you look at the completed map in the screenshot below, you’ll see a tiny sliver of yard that no amount of finagling could get Aiper to close up.

Watering runs can be initiated on demand or on a schedule, and you intriguingly define not an amount of time to run but a “water consumption limit,” measured in inches of water you want applied to the soil. While it’s nearly impossible to measure how accurate this is, qualitatively, those estimates felt about right in my testing.

In Area mode, the IrriSense 2 delivers water by spraying a jet in a single direction, rotating clockwise through its 360 degrees until it’s gone all the way around the map you’ve set before turning back and doing it again in a counter-clockwise direction, repeating this cycle until the desired irrigation depth has been reached.

While the IrriSense 2’s spray system is officially described as a gentle “mist,” it’s really more of a jet, particularly when it has to reach the far-away parts of the yard near the terminus of its range. That results in a lot more water being delivered to the edges of the yard than to the central portion of the mapped area, but that’s a common issue I’ve seen with rotary sprinklers like this. To account for this, the IrriSense 2 doesn’t just blast at full speed for the entirety of its run. Instead, repeated rotations reduce the pressure delivered bit by bit, until the final rotations are little more than a trickle of water hitting just a few inches away from the unit. (Note that canceling a run early means that only the outermost portions of the area will receive water.)

Photograph: Chris Null