The QTR-8A 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 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 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.

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  • Dimensions: 2.95" x 0.5" x 0.125" (without header pins installed)
  • Operating voltage: 3.3-5.0 V
  • Supply current: 100 mA
  • Output format: 8 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: 0.11 oz (3.09 g)

Question & Answer

Total 12 questions

Q: any update of the availability? waiting for it for quite a long time now... Questioned by taufiiqq, 21-Sep-2014

we have placed our order. It is supposed to come after Eid-ul-adha. Answered by A.R, 24-Sep-2014 17:52 PM

Q: Will it be available before February? Questioned by Pritom256, 11-Jan-2015

No chance. Answered by A.R, 11-Jan-2015 15:48 PM

Q: It contains 8 sensors. Is it available in 6 sensors version? Questioned by Ferdib, 25-Nov-2015

No. Answered by A.R, 26-Nov-2015 09:26 AM

Q: which one is comparatively good? QTR-8RC Reflectance Sensor Array or QTR-8A ?? Questioned by Navidahmed, 06-Nov-2016

Q: which one is comparatively good? QTR-8RC Reflectance Sensor Array Questioned by Navidahmed, 06-Nov-2016

Q: which one is comparatively good? QTR-8RC Reflectance Sensor Array or QTR-8A ?? Questioned by Navidahmed, 06-Nov-2016

It's not a matter of good or bad. One has digital output, another has analog. choice depends on your application. Answered by A.R, 06-Nov-2016 15:14 PM

Q: এই সেন্সরটির সাথ ছোট ছোট পিনগুলি পাওয়া যাবে? ছবিঃ Questioned by [email protected], 01-May-2022

Are you searching for this one? Answered by almamun3248, 07-May-2022 14:37 PM

Q: Pololu QTR-8RC Array Sensor available??? Questioned by [email protected], 08-Jul-2022

Pololu QTR-8RC Array Sensor is not available right now. You can check this one Digital IR Sensor Array 10RC. Product link: Answered by almamun3248, 16-Jul-2022 14:29 PM

Q: Is it original pololu sensor? Questioned by [email protected], 02-Dec-2022

Yes, it is. We directly source from them. Answered by almamun3248, 05-Dec-2022 12:19 PM

Q: is it available now? Questioned by Arnobpaul, 18-Mar-2023

Sorry, not yet in stock. Answered by almamun3248, 19-Mar-2023 11:24 AM

Q: এটা কি available হওয়ার সম্ভাবনা আছে ?? Questioned by ChandanKumar, 30-Jul-2023

এক মাসের মত লাগবে এভেইলবেল হতে, শিপমেন্টে আছে। Answered by Atiqur_ORELCO, 03-Aug-2023 12:08 PM

অনেক ধন্যবাদ। এর সাথে কি QTR-8RC টাও আসছে ? নাকি শুধুমাত্র QTR-8A টা আসবে ? Answered by ChandanKumar, 04-Aug-2023 17:35 PM

Q: When will this be restocked? Questioned by sadman3345, 11-Aug-2023

within this month Answered by Atiqur_ORELCO, 12-Aug-2023 10:11 AM

Reviews & Ratings


2 Ratings / 1 Reviews







ChandanKumar, 11-Nov-2021

খুব ভালো sensor। pololu বরাবরই বেশ ভালো মানের product দিয়ে থাকে । এক্ষেত্রেও তার ব্যতিক্রম নয়। PID line follower robot আর Maze Solver Robot তৈরি করে খুব ভালো result পেয়েছি ।


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