The Sharp distance sensors are a popular choice for many projects that require accurate distance measurements. This IR sensor is more economical than sonar rangefinders, yet it provides much better performance than other IR alternatives. Interfacing to most microcontrollers is straightforward: the single analog output can be connected to an analog-to-digital converter for taking distance measurements, or the output can be connected to a comparator for threshold detection.  The GP2Y0A21 uses a 3-pin JST connector that connects to our 3-pin JST cable for Sharp distance sensors . It is also simple to solder three wires to the sensor where the connector pins are mounted . When looking at the back, the three connections from left to right are power, ground, and the output signal.  

Specifications:

• Operating voltage: 4.5 V to 5.5 V
• Average current consumption: 30 mA (typical)
• Distance measuring range: 10 cm to 80 cm (4" to 32")
• Output type: analog voltage
• Output voltage differential over distance range: 1.9 V (typical)
• Response time: 38 ± 10 ms
• Package size: 29.5×13.0×13.5 mm (1.16×0.5×0.53")
• Weight: 3.5 g (0.12 oz)

Documents:

• Wiki Doc
• DataSheet

Package Includes:

• 1 x Sharp GP2Y0A21 IR Distance Sensor For Arduino - 10-80cm