QTI Sensor
QTI SensorQTI Sensor
QTI Sensor

QTI Sensor

Manufacturer: Parallax
Product Code: Sensors-IR-QTI_555-27401
Weight:0.25 lb
Reward Points:0
In Stock
Price: $9.99

QTI Sensor.QTI Sensor.QTI Sensor And Arduino.QTI Sensor Application.Light spectrum detail.

The QTI Sensor is an infrared emitter/receiver that is able to differentiate between a dark surface (with low IR reflectivity) and a light surface (with high IR reflectivity). These little sensors can be very handy for line following, maze navigation, or sensing the outer rim of a SumoBot ring. Wiring options allow it to be used digitally for fast black/white line following, or as an analog sensor to detect different shades of gray. A daylight filter is built into the sensor.

What does QTI stand for?

Q = Charge.
T = Transfer.
I = Infrared.

When your microcontroller measures the time it takes for the QTI's capacitor to decay, it's measuring a rate of charge transfer through an infrared phototransistor. This rate indicates how much infrared is reflecting off a nearby surface.

Key Features:

  • 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.


  • 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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