+44 (0) 1761 234 328

(0) items


You have no items in your shopping cart.

QTR-8RC Reflectance Sensor Array

Product Code: 961
Excl. VAT: £10.40 Incl. VAT: £12.48
You will earn 10 Robo Points for buying this product
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.

QTR-8C reflectance sensor array on a 3/4 inch line with a quarter for size reference.

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. The schematic diagram of the module is shown below:

QTR-8RC Reflectance Sensor Array Diagram



  • 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: 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)


Interfacing the QTR-8RC Outputs to Digital I/O Lines

Interfacing the QTR-8RC Outputs to Digital I/O Lines

Like the Parallax QTI, the QTR-8RC module has eight identical sensor outputs that require a digital I/O line capable of first charging the output capacitor (by driving the line high) and then measuring the time for the capacitor to discharge through the phototransistor. 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 all eight sensors is possible with most microcontrollers
  • Parallel reading allows optimized use of LED power enable option


The typical sequence for reading a sensor is:

  • Turn on IR LEDs (optional)
  • Set the I/O line to an output and drive it high
  • Allow at least 10 us for the 10 nF capacitor to charge
  • Make the I/O line an input (high impedance)
  • Measure the time for the capacitor to discharge by waiting for the I/O line to go low
  • Turn off IR LEDs (optional)


These steps can typically be executed in parallel on multiple I/O lines.

With a strong reflectance, the discharge time can be as low as several dozen microseconds; with no reflectance, the discharge time can be up to a few milliseconds. The exact time of the discharge depends on your microcontroller’s I/O line characteristics. Meaningful results can be available within 1 ms in typical cases (i.e. when not trying to measure subtle differences in low-reflectance scenarios), allowing up to 1 kHz sampling of all 8 sensors. If lower-frequency sampling is sufficient, substantial power savings can be realized by turning off the LEDs. For example, if a 100 Hz sampling rate is acceptable, the LEDs can be off 90% of the time, lowering average current consumption from 100 mA to 10 mA.


Breaking the Module in Two

If you don’t need or cannot fit all eight sensors, you can break off two sensors and still use all 8 sensors as two separate modules, as shown below. The PCB can be scored from both sides along the perforation and then bent until it snaps apart. Each of the two resulting pieces will function as an independent line sensor.

Breaking the module in two


Included Components

This module ships with a 25-pin 0.1" header strip and a 100 Ohm through-hole resistor as shown below.

Included Components

You can break the header strip into smaller pieces and solder them onto your reflectance sensor array as desired, or you can solder wires directly to the unit or use a right-angle header strip for a more compact installation. The pins on the module are arranged so that they can all be accessed using either an 11×1 strip or an 8×2 strip.

The resistor is required to make the two-sensor array functional after the original eight-sensor array is broken into two pieces. This resistor is only needed once the board has been broken.

Solder the included resistor to the 2-sensor array piece as shown to make the separated piece functional.

Solder the included resistor to the 2-sensor array piece as shown to make the separated piece functional.

Product Attachments

View FileAVR C/C++ Library User’s Guide    Size: (623.6 KB)
View FileArduino QTR Reflectance Library    Size: (261.61 KB)
View FileAVR Library Command Reference    Size: (374.68 KB)
View FileBuilding Line Following & Maze Courses    Size: (1.21 MB)
View FileQTR-8A & QTR-8RC Array User’s Guide    Size: (957.11 KB)
View FileFairchild’s QRE1113GR Datasheet    Size: (196.9 KB)
View FileQTR Reflectance Sensor App. Note    Size: (758.32 KB)

FeeFo Reviews

This product has no reviews yet.

Whenever possible, items which are in stock are dispatched the same day, or the next working day.

Large and/or heavy items are dispatched by UPS courier service and these orders must be placed before 15:00hrs (GMT) to ensure same day dispatch.

Small items are normally sent using a Royal Mail service for UK orders, and International Airmail or UPS for overseas orders

Returns Policy

QTR-8RC Reflectance Sensor Array