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→ultrasonic and IR rangefinders
one of many Sharp Rangers, with different effective ranges:
<quoteblockquote>
This sensor takes a continuous distance reading and returns a corresponding analog voltage with a range of 10cm (4") to 80cm (30"). The sensor package includes a JST 3-pin connector, three pre-crimped wires, and a booklet with detailed information and examples.
</quoteblockquote>
http://www.acroname.com/robotics/parts/R48-IR12.html