Strip with QTRX-MD-05A reflective sensors - 5-channel - analog - Pololu 4445

Index: PLL-13046 EAN: 5904422347949

Compact strap with five reflective sensors with the size of 37 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-05A reflective sensors - 5-channel - analog - Pololu 4445
€4.47 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 five 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-05A:

  • 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-05A.


  • Number of sensors: 5
  • Supply voltage: from 2.9 V to 5.5 V
  • Current consumption: 14 mA
  • Current consumption of one LED: 14 mA
  • Outputs: analog
  • 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: 37 x 20 x 3 mm
  • Weight: 1.9 g


Same-day shipping

  • Crediting the payment for the order on our account on a business day before 10:00 AM means sending the goods on the same day.
  • All packages are being delivered by GLS Group courier and covered with insurance up to 1200 EUR.
  • You will receive a link to track your package and monitor the progress of delivery as soon as it is shipped.

Terms of delivery 

GLS - zone 1

Austria, Belgium, Croatia, The Czech Republic, Denmark, Germany, Netherlands, Poland, Slovakia 

  • Delivery time: 2-4 days
  • Delivery cost: from 4.18 EUR
  • Insurance: 1200 EUR
GLS - zone 2

Bulgaria, Estonia, France, Hungary, Italy, Latvia, Lithuania, Luxembourg, Portugal, Romania, San Marino, Slovenia

  • Delivery time: 2-5 days
  • Delivery cost: from 5.35 EUR
  • Insurance: 1200 EUR
GLS - zone 3

Finland, Greece, Ireland, Spain, Sweden 

  • Delivery time: 2-7 days
  • Delivery cost: from 7.67 EUR
  • Insurance: 1200 EUR

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