Parallax QTI Light Sensor

ParallaxSKU: RB-Plx-74
Manufacturer #: 555-27401

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Sale price ¥1,717

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  • Capable of analog or digital outputs
  • Unfocused for sensing diffused surfaces
  • Easily interface with any Parallax microcontroller
  • RoHS Compliant

The Parallax QTI Light Sensor uses a QRD1114 infrared (IR) reflective sensor determine the reflectivity of the surface below it. For instance when the QTI sensor is over a dark surface, the reflectivity is very low and when the QTI is over a light surface, the reflectivity is very high. The QTI Sensors were originally meant to sense the outer rim of a SumoBot® ring; however these little line sensors can be very handy for other applications, including line following and maze navigation.


  • Capable of analog or digital outputs
  • No contact surface sensing
  • Unfocused for sensing diffused surfaces
  • Daylight filter on sensor
  • Easy to interface with any Parallax microcontroller
  • Dimensions: 1.25 x 0.37 in (31.7 x 9.4 mm)
  • Power requirements: 5 VDC
  • Communication: Analog output of capacitor decay time depending on level of infrared reflectivity
  • Dimensions: 1.25 x 0.37 in (31.7 x 9.4 mm)
  • Operating temp range: -40 to +185 °F (-40 to +85 °C)

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