Reflectance sensor QTR-L-1RC - digital (2 pcs) - Pololu 2455

Index: PLL-01407 EAN: 5904422367534

Module with reflective sensor basing on the transmitting LED and phototransistor operating in the infrared range. The sensor is powered with the 5V voltage. The output is the digital signal.

Reflectance sensor QTR-L-1RC - digital (2 pcs) - Pololu 2455
€3.51 tax excl.
Waiting time: 4-6 weeks
Only on request
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Manufacturer: Pololu
Compatibility: Arduino

Product description: Reflecting sensor QTR-L-1RC - digital (2 pcs)

The sensor consists of IR LED and receiver in the form of phototransistor. In addition to these two basic elements, in the circuit are: resistor limiting the transmitting LED's current 220Ω, and the time system on the basis of the 10nF and the resistor of 220Ω. Output are the time impulses, the duration of which depends on the color of the surface. The array below presents other examples of values depending on the distance and color of the surface.


Distance White surface Black insulating tape
6 mm 100 us 320 us
25 mm 160 us 260 us

The product is compatible with Arduino

The manufacturer has prepared a librarythat simplifies maintenance of the sensor for Arduino users.

Method of using

A typical sequence of the reading of sensors' values:

1. Turning on the IR LEDs (if previously disabled)

2. The significance of the I/O pins of the microntroller as outputs and the creation of a high status.

3. Waiting at least 10us. (charging the capacitor of 10nF)

4. Setting the I/O pins as inputs (high impedance status)

5. Measuring the discharge time of the capacitor by waiting until the I/O lines go into the low status.

6. Disabling the IR LEDs (optional).


The Pololu created AVR C/C++ library andlibrary for Arduino which facilitate the maintenance of the sensor.

Daylight, especially sunlight can affect the operation of the sensor. In the case when the output voltage is too low, you should install a rim that protects the sensor from the exposure to external light.

Pinout of QTR-L-1RC sensor

The sensor has three simple pins: power supply - VDD (supply voltage), ground - GND and the output OUT. For proper operation, it is sufficient to connect the power supply.

Specification of QTR-l-1RC reflective sensor

  • The supply voltage: 5 V
  • The average current consumption: 17 mA
  • Recommended measuring range: 3 mm - 6 mm
  • Maximum measuring range: 25 mm
  • Output: digital signal - the time pulses
  • Dimensions: 7.6 x 8.9 x 3.1 mm (without connectors)
  • Weight: 0.2 g (without connectors)


Voltage to 4.5 V
Voltage from 5.5 V
Interface analog
Sensor - distance to 0.5 cm
Sensor - distance from 0 cm

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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