Item #: 136
UPC: 00600489105618
Price: $14.99
    Points to Purchase: 2142
    Availability: In Stock
    Usually ships In 1-2 Business Days

    In Stock: 19
    The GP2Y0A21 Sharp distance sensor is a great way to add obstacle avoidance or motion sensing to your robot or any other project. With a detection range of 4" to 32" and an analog voltage indicating the distance, this sensor is very easy to use.

    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 10 cm to 80 cm (4" to 32"); a plot of distance versus output voltage is shown below.

    The GP2Y0A21 uses a 3-pin JST connector that is 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.

    Operating voltage: 4.5V to 5.5V
    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 x 13.0 x 13.5 mm (1.16 x 0.5 x 0.53in.)
    Weight: 3.5 g (0.12 oz)

    Linearizing the output
    The relationship between the sensor’s output voltage and the inverse of the measured distance is approximately linear over the sensor’s usable range. The GP2Y0A21YK data sheet (374k pdf) contains a plot of analog output voltage as a function of the inverse of distance to a reflective object. You can use this plot to convert the sensor output voltage to an approximate distance by constructing a best-fit line that relates the inverse of the output voltage (V) to distance (cm). In its simplest form, the linearizing equation can be that the distance to the reflective object is approximately equal to a constant scale factor (~27 V*cm) divided by the sensor’s output voltage. Adding a constant distance offset and modifying the scale factor can improve the fit of this line.

    Overall Customer Rating of 1 Reviews:
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    Sharp Analog Distance Sensor 10-80cm

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    I ordered 4 of these IR sensors to test their performance and am very please with them. They sensor's function as advertised. I mounted them on a small robot and read them with an Arduino Mega 2560. The robot can now avoid objects quite well. They were shipped to me quickly and were well packaged. Thank You Robot Marketplace for your fine service (as always)...