NOTES
• Keep the sensor lens clean. Dust, water, oil, and other contaminants can deteriorate the characteris-tics of this device. Applications should be designed to eliminate sources of lens contamination.
• When using a protective cover over the emitter and detector, ensure the cover efficiently transmits light throughout the wavelength range of the LED (λ = 850 nm ± 70 nm). Both sides of the protective cover should be highly polished. Use of a rotective cover may decrease the effective distance over which the sensor operates. Ensure that any cover does not negatively affect the operation over the intended application range.
• Objects in proximity to the sensor may cause reflec-tions that can affect the operation of the sensor.
• Sources of high ambient light (the sun or strong arti-ficial light) may affect measurement. For best results, the application should be designed to prevent interference from direct sunlight or artificial light.
• Using the sensor with a mirror can induce measurement errors. Often, changing the incident angle on the mirror can correct this problem.
• If a prominent boundary line exists in the surface being measured, it should be aligned vertically to avoid measurement error. See Figure 6 for further details.
• When measuring the distance to objects in motion, align the sensor so that the motion is in the horizontal direction instead of vertical. Figure 7 illustrates the preferred alignment.
• A 10 µF (or larger) bypass capacitor between VCC and GND near the sensor is recommended.
• To clean the sensor, use a dry cloth. Use of any liquid to clean the device ma y result in decreased sensitivity or complete failure.
• Excessive mechanical stress can damage the internal sensor or lens.
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con này hình như xài hồng ngoại, mà hồng ngoại thì ... không phải là "nhiễu" nữa mà là xả ra ào ào 