Strip with QTRX-MD-06A reflection sensors - 6-channel - analog - Pololu 4446

Index: PLL-12989 EAN: 5904422347857

Compact strap with six reflective sensors with the size of 45 x 20 mm. It has analog outputs, is powered with the voltage from 2.9 V to 5.5 V and allows for the adjustment of brightness regardless of the supply voltage. It detects the objects at a distance of about 40 mm.

Strip with QTRX-MD-06A reflection sensors - 6-channel - analog - Pololu 4446
€9.67 tax excl.
Waiting time: 4-6 weeks
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Manufacturer: Pololu
Compatibility: Arduino


The strap is used in robots like line follower as sensors detecting the track as a black line on a white background. The module consists of six reflective sensors that contain the transmitting IR LED and receiver in the form of phototransistor. Output are the analog signals that can be read using any microcontroller with A/C converter, including Arduino. Sensor QTRX features with a smaller consumption of current than QTR.




There are several solutions that allows to read data from sensors QTRX-MD-06A:

  • Connecting the outputs to microcontroller with analog to digital converter, for example, analog Arduino pins
  • Connecting to the digital inputs through the analog comparator, determining the threshold between white and black
  • Connecting directly to the digital pins, using built-in into microcontroller, internal comparator

The product is compatible with Arduino

For users of Arduino modules, manufacturer has prepared a library that simplifies the maintenance of the sensors:

library of Arduino.

The optimal distance of the sensors from the surface, is 10 mm, the maximum, at which the sensor operates, is 40 mm. To picture the situation, we present the oscilograms showing the detection of black line on a white background at different distances from the surface.

The analog signal, after the detection of black lines on white surface, in the close distance - on the left side and further on the right side. 



Each of phototransistors has pulling-up external resistor, allowing for the direct connection of the output to the microcontroller and the read of the voltage from 0 to VCC, appropriate for the color and distance from the surface.


Current of each transmitting LED was set to 3.5 mA, the maximum current consumption of the whole module is about 14 mA.

Diagram of the module QTRX-MD-06A.


  • Number of sensors: 6
  • Supply voltage: from 2.9 V to 5.5 V
  • Current consumption: 14 mA
  • Current consumption of a single LED: 3.5 mA
  • Outputs: digital
  • The optimal measurement distance: 10 mm
  • The maximum distance of measurements: 40 mm
  • Light wavelength: 940 nm
  • Sensor type: QTRX
  • Distance between sensors: 8 mm
  • Dimensions 45 x 20 x 3 mm
  • Weight: 2.3 g


Package width 5 cm
Package height 7 cm
Package depth 0.5 cm
Package weight 0.003 kg

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