QTR-8RC Reflectance Sensor Array

(0) 0 out of 5 stars Write reviewReport bug
  • Part No :
  • ROB-1708
  • Availability:
  • Out of Stock
  • Shipping :
  • Same Day*
  • Weight:
  • 0.05Kg
  • Made By:
  • Pololu - USA
  • Mfr.Part.No:
  • 961
  • Quality Rank:
  • 100/100
Rs 699
(Excluding GST.)
Rs 825
(Including GST)
825 rhydoLABZ.com New Out of Stock
  • Buy & earn 70  reward points
  • GST Invoice & Input Credit Available
Notify Me !
This sensor module has 8 IR LED/phototransistor pairs mounted on a 0.375" pitch, making it a great detector for a line-following robot. Pairs of LEDs are arranged in series to halve current consumption, and a MOSFET allows the LEDs to be turned off for additional sensing or power-savings options. Each sensor provides a separate digital I/O-measurable output.

The QTR-8RC 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 eight IR emitter and receiver (phototransistor) pairs evenly spaced at intervals of 0.375" (9.525 mm). Each phototransistor uses a capacitor discharge circuit that allows a digital I/O line on a microcontroller to take an analog reading of reflected IR by measuring the discharge time of the capacitor. Shorter capacitor discharge time is an indication of greater reflection.

The outputs are all independent, but the LEDs are arranged in pairs to halve current consumption. The LEDs are controlled by a MOSFET with a gate normally pulled high, allowing the LEDs to be turned off by setting the MOSFET gate to a low voltage. Turning the LEDs off might be advantageous for limiting power consumption when the sensors are not in use or for varying the effective brightness of the LEDs through PWM control.

The LED current-limiting resistors for 5 V operation are arranged in two stages; this allows a simple bypass of one stage to enable operation at 3.3 V. The LED current is approximately 20-25 mA, making the total board consumption just under 100 mA.

Specifications
  • Operating voltage: 3.3-5.0 V
  • Supply current: 100 mA
  • Output format: digital I/O compatible
  • Optimal sensing distance: 0.125" (3 mm)
  • Maximum recommended sensing distance: 0.375" (9.5 mm)
  • Weight without header pins: 0.11 oz (3.09 g)
Dimensions:
  • 2.95" x 0.5" x 0.125" (without header pins installed)
Documents:

 

Sort by: Recently  /  Helpful Write review

There are currently no any reviews about this product.

    • Q

    • What is the difference between QTR-8A and QTR-8RC?

      asked by Rahul MIshra on October 09, 2018
    • A

    • The QTR-8A uses a voltage divider for each sensor’s output while the QTR-8RC uses an RC circuit. Eight 47k voltage divider resistors on the QTR-8A are replaced by capacitors on the QTR-8RC.

Also purchased

Ask a question about QTR-8RC Reflectance Sensor Array

Report issue about the QTR-8RC Reflectance Sensor Array



Ask a question about the QTR-8RC Reflectance Sensor Array

Report issue about the QTR-8RC Reflectance Sensor Array



Request price match for the QTR-8RC Reflectance Sensor Array

Found this item with same quality and at a lower price but prefer to buy from rhydoLABZ.com?

Please submit the url of the better price you saw. We will lauch an immediate investigation and try our best to beat the price, if it proves to be the same product. We will notify you the result by email. Thanks a lot for helping us to maintain competitive prices.

QTR-8RC Reflectance Sensor Array



Sponsors