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Trim with QTR-3RC reflective sensors - digital - Pololu 2457

Index: PLL-01731

Compact bar with three reflective sensors with the size of 32 x 8 mm. It has analog outputs, it is powered with the voltage of 5 V.

€4.63
€3.76 tax excl.

In stock, shipping 24 hours!
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Manufacturer: Pololu
Compatibility: Arduino

Specification:

  • Number of sensors: 3
  • Supply voltage: 5 V
  • Current consumption: 50 mA
  • Outputs: digital - frequency signal
  • The optimum distance for measurement: 3 mm
  • The maximum distance for measurement: 6 mm
  • Dimensions 32 x 8 x 3 mm
  • Weight: 0.6 g
 
The kit includes one module with sensors and two goldpin straps: straight and corner for self-soldering.
 

Description

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 three reflective sensors that contain the IR transmitting LED and receiver in the form of phototransistor. The output are the digital signals which can be read using any microcontroller with an A/C converter, including Arduino.

 

Between the sensors left is 9.5 mm space so that a strap was reliable on the tracks applied with the standard insulating tape with the width of 19 mm.

 

Service

Strap QTR-3RC, similarly to the QTR-8RC module, has digital outputs. Reading the measurement data, is carried out by charging the capacitor (the indication of high status), and measuring the time of discharge of it through phototransistor. This option has the following advantages:

  • It does not require an analog-to-digital converter
  • Gives the possibility of parallel read of the values of three sensors
 

A typical sequence of the reading of sensor's values:

  1. Setting the I/O pins of the microcontroller as outputs and the creation of the high status
  2. Waiting a few micro seconds - charging the capacitor of 2.2 NF
  3. The setting of the I/O pins as input (high impedance status)
  4. Measuring the discharge time of the capacitor by waiting till the I/O lines come to low status
 
With a high intensity of the reflected signal, the measured time will be oscilating within a few microseconds. A small amount of reflected light will be discharging the capacitor for a few milliseconds. The exact time depends on characteristics of the pins of the microcontroller.
 

The product is compatible with Arduino

For users of AVR microcontrollers and modules of Arduino, the manufacturer has prepared special libraries facilitating the convenient operation of sensors: the AVR library, the Arduino library.

 

Scheme

Each of phototransistors uses a capacitor and an auxiliary circuit that can read data from the sensors by measuring the time of discharge.

 

Current to each transmitting LED was set to 17 mA, what at powering with the voltage of 5 V makes that the average current consumption of the whole module is about 50 mA.

 

 

Diagram of the module QTR-3RC.

 

Same day shipping

Posting the payment for the order on our account on a business day up to 10 AM means sending the goods on the same day!

The time of payment depends on the ELIXIR's hours session of the sender's bank and the recipient of the transfer. It may take up to 2-4 working days.

Free delivery for orders exceeding 300 PLN!

Only for prepaid orders shipped to Poland.

Terms of delivery outside of Poland

GLS - zone 1

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

  • Delivery time: 2-4 days
  • Delivery cost: 35 PLN
  • Insurance: 5000 PLN
GLS - zone 2

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

  • Delivery time: 2-5 days
  • Delivery cost: 50 PLN
  • Insurance: 5000 PLN
Kurier GLS - zone 3

Finland, Greece, Ireland, Liechtenstein, Serbia, Spain, Switzerland, Sweden

  • Delivery time: 2-7 days
  • Delivery cost: 80 PLN
  • Insurance: 5000 PLN

Terms of delivery in Poland

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Poczta Polska
  • Delivery time: 1-3 days
  • Payment in advance: od 9,90 PLN
  • Cash on delivery: 17,90 PLN
  • Insurance: 1000 PLN
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Kurier GLS
  • Delivery time: 1-2 days
  • Payment in advance: od 14,90 PLN
  • Cash on delivery: 22,90 PLN
  • Insurance: 6000 PLN
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Paczkomaty 24/7
  • Delivery time: 1-3 days
  • Payment in advance: od 12,90 PLN
  • Over 8000 parcel lockers
  • Insurance: 200 PLN
  • Free delivery of orders over 300 PLN does not apply to parcels addressed outside of Poland.
  • The delivery period is counted in working days from the date of dispatch of the order.

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