Strip with reflective sensors QTR-HD-05A - 5-channel - analog - Pololu 4205

Index: PLL-13087 EAN: 5904422348151

Compact strap with five reflective sensors with the size of 21 x 20 mm. It has digital 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. The QTR sensor has no lenses.

Strip with reflective sensors QTR-HD-05A - 5-channel - analog - Pololu 4205
€4.80 tax excl.
Waiting time: 4-6 weeks
Only on request
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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. SensorQTR has no lensesand featurea higher consumption of current thanQTRX.


There are several solutions that allows to read data from sensors QTR-HD-03A:

  • Connecting the outputs to microcontroller with analog to digital converter, for example, analog Arduino pins
  • Connecting to the digital inputs through theanalog 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 5 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 30 mA, the maximum current consumption of the whole module is about 93 mA.

Diagram of the module QTR-HD-05A.


  • Number of sensors: 5
  • Supply voltage: from 2.9 V to 5.5 V
  • Current consumption: 93 mA
  • Current consumption of one LED: 30 mA
  • Outputs: analog
  • The optimal measurement distance: 5 mm
  • The maximum distance of measurements: 40 mm
  • Light wavelength: 940 nm
  • Sensor type: QTRX
  • Distance between sensors: 4 mm
  • Dimensions: 21 x 20 x 3 mm
  • Weight: 1.2 g


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