Parallax 555-27401 Manual page 3

Program KickStarts
Each of the example programs displays current value from the QTI sensor as a number.
The lower the number, the lighter the surface. Or for object detection, the closer the sensor is to
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the object.
The higher the number, the darker the surface. Or for object detection, the farther the sensor is
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to the object.
The range of values depends on the microcontroller (due to how the microcontroller measures
the capacitor transfer decay time), but is typically about 30 to 2000. The range will also depend
on the reflectivity of the object.
Some objects, like the black antistatic foam used to protect electronic circuit boards, reflect little
or no infrared light, and the QTI cannot reliably detect these.
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