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The distance sensor produced by Sharp is a popular and relatively low cost solution for measuring distance. The sensor can be used also for measuring the rightness or color (in very limited extent) but in this article we will talk only about measuring distances.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 detection range of this version is approximately 20 cm to 150 cm (8" to 60"); a plot of distance versus output voltage is shown below.

The GP2Y0A02 uses a 3-pin JST connector that works with our 3-pin JST cables for Sharp distance sensors (included). It is also simple to solder three wires to the sensor where the connector pins are mounted (see the lower picture to the right). When looking at the back, the three connections from left to right (last picture) are output signal, ground, and the power

  1. Infrared Proximity Sensor;
  2. Analog output inversely proportional to distance;
  3. Sensor is Ratiometric;
  4. Operating Supply Voltage = 4.5V to 5.5V;
  5. Average Supply Current – Typical = 30mA;
  6. Response Time = 38 ± 10ms.

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