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

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.

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Price 19,90 zł

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 mm100 us320 us
25 mm160 us260 us

The product is compatible with Arduino

The manufacturer has prepared a library that 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 and library 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


Posting the payment for the order on our account on a business day up to 13:00 means sending the goods on the same day!


The time of payment depends on the hours of ELIXIR session of the sender's bank and the recipient of the transfer (more information on this subject, for example on the website


The table presents available forms of delivery in Poland


Carrier and

Bank wire

by cash


Poczta Polska

terms of service

9,90 PLN17,90 PLN1-3 days

Kurier GLS

terms of service

14,90 PLN22,90 PLN

1-2 days

Paczkomaty 24/7 

terms of service

12,90 PLN-1-3 days

If the amount to pay for products exceeds 500 PLN
Delivery is for free!


  • Free delivery of orders over 500 PLN does not apply to parcels addressed outside of Poland.
  • Free delivery does not apply when changing orders.
  • The delivery period is counted in working days from the date of dispatch of the order.