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QTR-3A Reflectance Sensor Array

Principal

Módulo que incluye tres pares de LEDS IR/Fototransistor (sensores reflectivos) con salida analógica. Ideal para utilizar como sensor de seguimiento de línea en proyectos de robótica.

COD: P002456

Peso: 0.000 Kg

Disponibilidad: En Stock

Su correo electrónico:

ARS 144.00

Cantidad:

El producto no está disponible para la venta en este momento

Características

This compact module packs three IR LED/phototransistor pairs onto a 1.25″ × 0.3″ board. The sensors are mounted on a 0.375″ pitch, making this array a great minimal sensing solution for a line-following robot. Each sensor provides a separate analog voltage output.

Functional Description

The QTR-3A reflectance sensor array is intended as a line sensor, but it can be used as a general-purpose proximity or reflectance sensor. The module is a convenient carrier for three IR emitter and receiver (phototransistor) pairs. With sensors spaced at intervals of 0.375″ (9.525 mm) along of the board’s longer axis, this array works well as a minimal detector for line-following robots, as line-following courses are commonly made using 3/4″ (19 mm) black electrical tape. The middle sensor is slightly offset along the short axis of the board.

Each phototransistor is connected to a pull-up resistor to form a voltage divider that produces an analog voltage output between 0 V and VCC (which is typically 5 V) as a function of the reflected IR. Lower output voltage is an indication of greater reflection.

The LED current-limiting resistors are set to deliver approximately 17 mA to the LEDs when VCC is 5 V, making the total board consumption just over 50 mA. 

Specifications

 

 

  • Dimensions: 1.25″ × 0.3″ × 0.1″ (32 × 8 × 3 mm) (without header pins installed)
  • Operating voltage: 5.0 V
  • Supply current: 50 mA
  • Output format: 3 analog voltages
  • Output voltage range: 0 V to supplied voltage
  • Optimal sensing distance: 0.125" (3 mm)
  • Maximum recommended sensing distance: 0.25" (6 mm)
  • Weight without header pins: 0.02 oz (0.6 g)

Interfacing with the QTR-3A Outputs

There are several ways you can interface with the QTR-3A outputs:

  • Use a microcontroller’s analog-to-digital converter (ADC) to measure the voltages.
  • Use a comparator with an adjustable threshold to convert each analog voltage into a digital (i.e. black/white) signal that can be read by the digital I/O line of a microcontroller.
  • Connect each output directly to a digital I/O line of a microcontroller and rely upon its internal comparator.

 

Included Components

This module has two mounting holes intended for #2 screws (not included); if the mounting holes are not needed, the ends of the PCB can be ground off to make the unit even smaller (less than 1″ wide). The reflectance sensor array ships with a 1×5 straight male header strip and a1×5 right-angle male header strip. You can also solder wires, such as ribbon cable, directly to the pads for the smallest installation.

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