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A sprinkler system timer is an electrical device that is used to set a irrigation sprinkler system to come on automatically at a certain time. Early timers were large and cumbersome with numerous mechanical parts and were usually relegated to agricultural and commercial applications. Compact irrigation timers did not become commonplace until the late 1970s when Rain Bird introduced their "Rain Clock" series of timers. These had an electromechanical "at-a-glance" interface and were simple to program and operate, as well as durable. The RC-7A timer, part of this series, was "standard issue" in many tract homes in the 1980s.

In the late 1980s, the irrigation company Hydro-Rain introduced the first "hybrid" controller design which combined electronic programming with a visual programming interface involving a single selector dial. This overtook the electromechanical timers as the most common design, and today nearly all timers sold are hybrid designs.

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