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Parallax QTI Sensor KickStart (#555-27401)
What It Can Do
• Detects differences between light and dark objects
• Proximity detection to judge relative distance to an object
• Works as an analog sensor, but can be connected to a digital I/O pin
The QTI Sensor uses an infrared light emitting diode and infrared phototransistor to provide
simple but effective non-contact detection of patterns and objects. In either case, light emitted by
the LED bounces off a surface or object, and is detected by the phototransistor.
For pattern detection, the sensor can differentiate between light and dark surfaces, such as a
black line drawn on a piece of white paper (useful as a robot line follower).
For object detection, the sensor can judge whether it’s close to an object by how much infrared
light is reflected from it (useful as a tabletop edge detector).
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