Trim with QTR-8RC reflective sensors - digital

Strap with eight odbiciowymi sensors with digital output. Voltage supply 5 V or 3.3 V.

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Cena: 37,90 zł


  • Dimensions: 75 x 127 x 4 mm
  • Supply voltage 5 or 3.3 V
  • Supply current 100 mA
  • Signal output: digital (compatible with the conclusions I/O)
  • Maximum measurement distance: 9.5 mm
  • Weight: 3,09 g

Listwa z czujnikiem odbiciowym


The system, consisting of eight sensors odbiciowych (pair: led IR and fototranzystor), was designed to detect black lines on a white background.

The reading is done by measuring the discharge time of the capacitor, which is associated with fototranzystory. With this solution the user should not use the inverter A/C.

LEDs IR radiation, to reduce electricity consumption, were paired. Controlled through a MOSFET transistor turns on position, higher, low. This solution allows you to turn off the LEDs when not in use and thus reduce energy consumption.

The current single led is in the range of 20-25 mA. All the module loads, so approx. 100mA.


Diagram of the system shown in the figure below:

Schemat listwy QTR-8RC

Diagram of a lath QTR-8RC.


Read values


The reading is done by measuring the discharge time of the capacitor. With this solution the user must not use the Converter analog to digital.


A typical sequence of the reading of sensor values:

1. The inclusion of IR LEDs ( if previously disabled)

2. The importance of the conclusions I/O of the microcontroller output and the creation of a high position.

3. Wait at least 10us. (charging capacitor 10nF)

4. The importance of the conclusions I/O as input (high impedance state)

5. Measuring the discharge time of the capacitor through the waiting line to, pass into a low state.

6. Disabling the IR LEDs (optional).


The company Pololu created bibliotękę AVR C/C++that simplifies the use of the product. Entered it also functions to support the bar, QTR.

Also available is a library for the Arduino project.



What's in the kit?

The kit includes the module with sensors, bar goldpin and the resistor is 100 Ohms.

Listwa z czujnikami odbiciowymi

There is the possibility of separating the strap into two parts. Both plates will work as separate units.

Listwa z czujnikami odbiciowymi QTR-8RC


For the proper functioning of the small tiles need a 100 Ohm resistor (supplied). The item must be soldered as shown in the figure below:

Wlutowananie rzestora w płytke



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.