Today’s best smart sprinkler systems let you schedule how often your lawn should be watered and for how long each session. The better models also take weather conditions into account to ensure you’re not irrigating unnecessarily. This new system from Irrigreen does all that, but its robotic sprinkler heads tailor their spray patterns so they don’t overlap. They’ll also adjust their rate of flow—even taking fluctuations in water pressure into account—to match the precise shape of your lawn. The secret is technology that was first developed for inkjet printers. Irrigreen co-founder and CTO Gary …