Sharp GP2Y0A51SK0F Analog Distance Sensor (2-15cm)

The GP2Y0A51SK0F is the shortest range analog distance sensor we have from Sharp, with a detection range of 0.8″ to 6″ (2cm to 15cm). The shorter radius gives you higher resolution measurements and the short minimum detection distance makes this sensor great for detecting very close objects. The distance is indicated by an analog voltage, which makes this sensor very easy to use.

The relationship between the sensor output voltage and the inverse of the measured distance is approximately linear over the entire usable range of the sensor. The GP2Y0A51SK0F datasheet contains a graph of the analog output voltage as a function of the inverse of the distance to a reflective object. You can use this graph to convert the sensor output voltage to an approximate distance by constructing a regression line that correlates the inverse of the output voltage (V) with the distance (cm).

Technical Specifications:
Manufacturer: Pololu / Sharp
Product Code: GP2Y0A51SK0F
Measurement Range: 20mm - 150mm
Dimensions: 27 mm × 13.2 mm × 14.2 mm (1.06″ × 0.52″ × 0.56″)
Update Rate: 16.5 ± 4 ms
Output: Analog
Operating Voltage: 4.5V - 5.5V
Current Draw: 12mA (Note: this sensor draws current in short, sharp pulses, and the manufacturer recommends putting a 10 µF or larger capacitor between the supply and ground, close to the sensor, to stabilize the supply line.)
Weight: 2.7g
Official Documentation