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The GP2Y0D805Z0F is Sharp's smallest and fastest distance sensor, and Pololu's tiny carrier board for these sensors includes all of the external components required to make them work. With a sample rate of almost 400 Hz and a sensing distance to 5 cm, this sensor provides an attractive alternative to shorter-range LED-phototransistor reflectance pairs and longer-range but slower sensors such as the Sharp GP2Y0D805Z0F analog distance sensor. The output, Vo, is driven low when the sensor detects an object; otherwise, the output is high.
The GP2Y0D810Z0F detects objects between 2 cm and 5 cm away. There are a few millimeters of hysteresis around the maximum range threshold and no hysteresis at the minimum range threshold. Note that these sensors will only tell you if there is an object within the detection range along their lines of sight; they will not tell you how far away the object is.