The GP2Y0A41SK0F is the shortest-range Sharp analog distance sensor we carry, featuring a detection range of 1.5″ to 12″ (4 cm to 30 cm). The shorter range gives you higher resolution measurements, and the lower minimum detection distance makes this sensor great for detecting very close objects. The distance is indicated by an analog voltage, making this sensor very easy to use.
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Datasheet for the Sharp GP2Y0A41SK0F distance measuring sensor unit.