QTR-3A Reflectance Sensor Array - Analog

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Product Code: 91175
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Product Description
  • Line sensor
  • General purpose proximity or reflectance sensor
  • 3 IR emitter and receiver pairs
  • Maximum 6mm sensing range
$5.38
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QTR-3A Reflectance Sensor Array - Analog info

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 evenly spaced at intervals of 0.375" (9.525 mm). Each phototransistor is connected to a pull-up resistor to form a voltage divider that produces an analog voltage output between 0 V and VIN (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.

 

QTR-3A Reflectance Sensor Array - Analog - General Specifications

  • Line sensor
  • General purpose proximity or reflectance sensor
  • 3 IR emitter and receiver pairs
  • Maximum 6mm sensing range

 

QTR-3A Reflectance Sensor Array - Analog - Technical Specifications

  • Dimensions: 32mm x 8mm x 3mm (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: 0.6g

 

Videos

 

 

Documents

QTR-3A reflectance sensor array schematic diagram

Datasheet for the Sharp GP2S60 compact reflective photointerrupter

Pololu QTR Reflectance Sensor Application Note: https://www.pololu.com/docs/0J13

Pololu AVR C/C++ Library User’s Guide: https://www.pololu.com/docs/0J20

Arduino Library for the Pololu QTR Reflectance Sensors: https://www.pololu.com/docs/0J19

Pololu AVR Library Command Reference: https://www.pololu.com/docs/0J18

 

References

Pololu Web Site: https://www.pololu.com/product/2456

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