Smart Sprinkler Controllers: What They Do and What to Check Before Buying

Smart sprinkler controllers promise to take the guesswork out of watering. They connect to Wi-Fi, pull in weather data and adjust run times on their own. For many Fort Worth homes, they are a real improvement over a basic timer that runs the same schedule all year. They are not magic, though, and they still need to be set up correctly. This article explains how they work, what they do well and what to check before you buy one.

How Smart Controllers Work

A smart controller replaces your existing timer and connects to the same valve wires. It connects to your home Wi-Fi and uses one or more sources of information to decide how much to water:

• Local weather data, such as temperature, rainfall, humidity and wind
• Forecasts, so it can skip watering before expected rain
• Evapotranspiration estimates, a measure of how much water plants lose to heat and sun
• Zone details you enter, such as grass type, sun exposure, slope, soil type and head type
• Optional sensors, like on-site rain or soil moisture sensors

Based on that information, it raises or lowers run times, or skips a day entirely when the lawn does not need water.

What Smart Controllers Do Well

• Adjust through the seasons automatically. No more forgetting to turn run times down in fall.
• Skip watering after rain. Many will also skip before forecast rain.
• Let you control the system from your phone. Useful for testing zones and running a quick cycle.
• Keep a history of when each zone ran, which helps with troubleshooting and water bills.
• Send alerts for problems like a skipped cycle or a wiring fault on some models.

What They Do Not Do

• They do not fix broken equipment. A smart controller cannot make up for broken heads, leaks, mixed head types or poor coverage. Fix those first. Our zone-by-zone system check is a good place to start.
• They do not override the watering rules. Fort Worth states that all water customers must water only on their designated days, even when using smart technology. You must still limit the controller to your two assigned days and to the hours outside 10 a.m. to 6 p.m.
• They depend on good setup. Wrong soil or head settings lead to wrong run times.
• They depend on Wi-Fi. Most will keep running their last schedule if the connection drops, but you lose weather adjustments and remote control.

Setting One Up for Fort Worth

1. Restrict watering days to Wednesday and Saturday for even addresses or Thursday and Sunday for odd addresses. Many apps have a setting for local watering restrictions.
2. Block the restricted hours so the controller never runs between 10 a.m. and 6 p.m.
3. Enter accurate zone details. Clay soil, slope, sun or shade, grass type and head type all affect run times.
4. Turn on cycle and soak if the controller supports it, especially for spray zones on clay. See our guide to cycle and soak scheduling.
5. Connect or enable the rain and freeze sensor. Fort Worth requires rain and freeze shut-off technology on residential systems installed on or after June 1, 2007, and on repairs that replace the controller. Some smart controllers meet part of this through weather data; check with the installer. Our article on rain and freeze sensors explains the requirement.
6. Watch the first few weeks and adjust zones that look too wet or too dry.

Controller Replacement and the Rules

Fort Worth’s irrigation code says that repairs or alterations requiring replacement of an existing controller must include operational rain or moisture and freeze shut-off technology. When you upgrade to a smart controller, make sure your system meets that requirement.

What to Check Before You Buy

• Zone count. Get a model with at least as many stations as your system has zones, plus any you may add.
• Master valve support. If your system has a master valve, make sure the controller can run it.
• Sensor input. Check that it can connect to your existing rain and freeze sensor, or that it offers a compatible option.
• Indoor or outdoor mounting. Outdoor units need weather-resistant housings.
• Wi-Fi signal at the mounting spot. A garage far from the router may need a signal booster.
• App quality. Look at how the app handles watering restrictions and manual runs.

Installing a Smart Controller

Replacing a controller is usually a matter of moving the valve wires from the old terminals to the new ones, connecting the common and sensor wires, and plugging it in. Take a photo of the old wiring before you disconnect anything. If the wiring is damaged or confusing, see our article on a controller that is not working.

Is It Worth It?

For many homes, a smart controller helps avoid overwatering, especially in spring and fall when weather changes quickly. It works best on a system that is already in good repair. If your system has leaks, broken heads or mixed zones, fixing those will usually make a bigger difference first. Our guide to programming for Fort Worth’s watering days can help if you decide to keep a standard controller.

When to Call a Technician

If you want a smart controller installed and set up correctly for your yard and the city’s rules, our sprinkler repair service can handle it along with any repairs the system needs.