QTR-8RC Reflectance Sensor Array

Model : ROB-00094

Brand : Pololu,USA

Supplier : Pololu, USA

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Line following sensor consisting of 8 IR LED/phototransistor pairs with digital 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). To use a sensor, you must first charge the output node by applying a voltage to its OUT pin. You can then read the reflectance by withdrawing the externally supplied voltage and timing how long it takes the output voltage to decay due to the integrated phototransistor. Shorter decay time is an indication of greater reflection. This measurement approach has several advantages, especially when coupled with the ability of the QTR-8RC module to turn off LED power:

  • No analog-to-digital converter (ADC) is required
  • Improved sensitivity over voltage-divider analog output
  • Parallel reading of multiple sensors is possible with most microcontrollers
  • Parallel reading allows optimized use of LED power enable option

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Rayhan121290 | Jul 11,2014 at 03:36 PM
when it will be available ?
A.R | Jul 12,2014 at 01:20 PM
At least a month later.
Rabbyctg | Jan 1,2015 at 02:13 AM
when this sensor will be available? i need it very soon
A.R | Jan 1,2015 at 09:40 AM
No chance of bringing it soon, sorry.
AnimeshMitra13 | Jan 15,2016 at 09:44 AM
When will this sensor be available sir
A.R | Jan 20,2016 at 04:29 PM
Hopefully within next week.
AnimeshMitra13 | Jan 25,2016 at 01:45 PM
can you specify the date when this sensor will arrive its been about 20 days I am looking forward to buying this sensor
AnimeshMitra13 | Apr 1,2016 at 09:24 AM
Sir when will this sensor be available
Alif007 | Jun 27,2016 at 05:50 PM
can i use it without arduino library
FAHIM_REAZA | Jul 10,2016 at 11:40 AM
Yes you can.
Anindya11 | Oct 6,2016 at 10:21 AM
are the headers soldered? If not can u guys solder it for me? Badly need help.
Navidahmed | Nov 7,2016 at 03:18 PM
I have placed an order for this component. Order no: 130416....Before the delivery, would you mind just checking the component to be sure about it's accuracy ? The headers aren't soldered.Can the type of header pins that is used for LCD be used with this one?

A.R | Nov 7,2016 at 03:51 PM
It came from Pololu, so we have no doubt about its accuracy. Male headers are included with the product. User have to solder that.
Navidahmed | Nov 16,2016 at 01:15 PM
i have purchased this product....can I use only 3 sensors out of 8 ...? if three sensors can be used, then am i supposed to make any change except the following change.... sensor_num=3 (in stead of 8)and pin no. declaration for sensors (for 3 digital pins only)....and do i need to make change to library or to anything else?
urgent plz
A.R | Nov 16,2016 at 02:53 PM
You can. No change in library.
Navidahmed | Nov 25,2016 at 07:18 PM
will this sensor be able to detect black line if the line is 8 cm wide(the width of the black line covers up all the 8 sensors)?
or, the line should be so thin that covers only 1 sensor....?

urgent query!
A.R | Nov 26,2016 at 11:25 AM
Line must not be thinner than the distance between two consecutive sensor pairs. That's it.
Navidahmed | Nov 26,2016 at 04:45 PM
if line covers 3 sensors..then will it be any problem? the line already been drawn is much wide that covers 3 sensors...
A.R | Nov 27,2016 at 09:33 AM
No problem
Navidahmed | Nov 27,2016 at 06:37 PM
it's working....:)
thank you for the support....

Motors being supplied with an external 10-11 V power,it runs quite faster...
If I set a command for motor base speed or motor maximum speed (motor_pwm_speed as 150 or something like this), then should I keep the external motor power source (which is 10-11V)...??? or in this case it just should be connected to Arduino (to any MotorPower pin) ?????

A.R | Nov 28,2016 at 09:29 AM
External source must be always used depending on the voltage rating of your motor.
Navidahmed | Nov 29,2016 at 02:00 AM
Is it always required and better to use motor driver shield than only motor driver IC? I mean, can't we make it possible with just an L293D IC for a line follower?
A.R | Nov 29,2016 at 09:34 AM
Yes. Why not? Shield makes Arduino coding and circuitry easier. That's it.
Navidahmed | Dec 2,2016 at 04:06 PM
My Last Help Post:
qtr 8 rc(2012) sensor er 8 ta sensor 1,2,3......,8 ebhabe mark kora achhe.... but online e dekhlam ager model gulo te 0 theke 7 porjonto mark kora chhilo....
tahole ki amar sensor e sensor value 0 er jaygate 1, 1 er jaygay 2..ebhabe hobe??? and accordingly line position value o from 0000 to 7000 er poriborte 1000 to 8000??? im kinda confused with this...
A.R | Dec 4,2016 at 09:39 AM
লাইব্রেরিতে যেভাবে আছে সেভাবে লিখলেই হবে।
Navidahmed | Dec 4,2016 at 10:55 AM
ow..i see
Rifat_Raiyan | Feb 10,2017 at 09:31 PM
When will this be available again?
SaminPlayz | Feb 7,2018 at 02:52 PM
When will this be available?
A.R | Feb 7,2018 at 05:22 PM
Next week hopefully. You can consider this one too:

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