Pololu QTR Reflectance Sensors

QTR sensor size comparison. Top row: QTRX-HD07, QTR-HD07; middle row: QTR-3, QTR-1, QTR-L-1; bottom row: QTR-8.

This table summarizes the newer QTR/QTRX sensors with black PCBs introduced in August 2018 (older QTR sensors are listed farther down this page):

Sensor
type
Supply
voltage
Max LED
current
Optimal
range
Max
range
Board
length
Pitch Sensor
count
Max board
current(2)
Output
type
Name 1-piece
price
QTRX 2.9 V to 5.5 V 3.5 mA(1) 10 mm 50 mm 10.2 mm 4 mm 2 5 mA RC (digital) QTRX-HD-02RC $2.88
analog QTRX-HD-02A
17.0 mm 4 mm 4 9 mA RC (digital) QTRX-HD-04RC $4.78
analog QTRX-HD-04A
29.0 mm 4 mm 7 17 mA RC (digital) QTRX-HD-07RC $8.06
analog QTRX-HD-07A
8 mm 4 9 mA RC (digital) QTRX-MD-04RC $4.96(3)
analog QTRX-MD-04A
12 mm 3 9 mA RC (digital) QTRX-12P-03RC $4.07(3)
analog QTRX-12P-03A
QTR 2.9 V to 5.5 V 30 mA(1) 5 mm 50 mm 10.2 mm 4 mm 2 32 mA RC (digital) QTR-HD-02RC $2.12
analog QTR-HD-02A
17.0 mm 4 mm 4 62 mA RC (digital) QTR-HD-04RC $3.26
analog QTR-HD-04A
29.0 mm 4 mm 7 125 mA RC (digital) QTR-HD-07RC $5.40
analog QTR-HD-07A
8 mm 4 62 mA RC (digital) QTR-MD-04RC $3.44(3)
analog QTR-MD-04A
12 mm 3 62 mA RC (digital) QTR-12P-03RC $2.93(3)
analog QTR-12P-03A
1 Independent of supply voltage; can be dynamically reduced to any of 32 available dimming levels.
2 With all LEDs on at their maximum brightness setting.
3 Available by special order only; contact us for availability.

Products in category “Pololu QTR Reflectance Sensors”

Pololu item #: 4302
Brand: Pololu
Status: Active and Preferred 
Free add-on shipping in USA 
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:
sensors pitch size
(mm)
output max current optimal
range
LED board
2 4 mm 10.2 × 20.0 RC (digital) 3.5 mA 5 mA 10 mm

This array of IR LED/phototransistor pairs is great for precisely identifying changes in contrast/reflectance (like line-detection). It operates from 2.9 V to 5.5 V and offers dimmable brightness control independent of the supply voltage. In general, the closer the object, the higher the contrast between light and dark, but high-reflectance objects are generally detectable out to around 50 mm. This version features high-performance, low-current QTRX sensors with lenses.

Pololu item #: 4402
Brand: Pololu
Status: Active and Preferred 
Free add-on shipping in USA 
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:
sensors pitch size
(mm)
output max current optimal
range
LED board
2 4 mm 10.2 × 20.0 analog 3.5 mA 5 mA 10 mm

This array of IR LED/phototransistor pairs is great for precisely identifying changes in contrast/reflectance (like line-detection). It operates from 2.9 V to 5.5 V and offers dimmable brightness control independent of the supply voltage. In general, the closer the object, the higher the contrast between light and dark, but high-reflectance objects are generally detectable out to around 50 mm. This version features high-performance, low-current QTRX sensors with lenses.

Pololu item #: 4102
Brand: Pololu
Status: Active and Preferred 
Free add-on shipping in USA 
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:
sensors pitch size
(mm)
output max current optimal
range
LED board
2 4 mm 10.2 × 20.0 RC (digital) 30 mA 32 mA 5 mm

This array of IR LED/phototransistor pairs is great for precisely identifying changes in contrast/reflectance (like line-detection). It operates from 2.9 V to 5.5 V and offers dimmable brightness control independent of the supply voltage. In general, the closer the object, the higher the contrast between light and dark, but high-reflectance objects are generally detectable out to around 50 mm. This version features the traditional-style QTR sensors without lenses.

Pololu item #: 4202
Brand: Pololu
Status: Active and Preferred 
Free add-on shipping in USA 
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:
sensors pitch size
(mm)
output max current optimal
range
LED board
2 4 mm 10.2 × 20.0 analog 30 mA 32 mA 5 mm

This array of IR LED/phototransistor pairs is great for precisely identifying changes in contrast/reflectance (like line-detection). It operates from 2.9 V to 5.5 V and offers dimmable brightness control independent of the supply voltage. In general, the closer the object, the higher the contrast between light and dark, but high-reflectance objects are generally detectable out to around 50 mm. This version features the traditional-style QTR sensors without lenses.

Pololu item #: 4304
Brand: Pololu
Status: Active and Preferred 
Free add-on shipping in USA 
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:
sensors pitch size
(mm)
output max current optimal
range
LED board
4 4 mm 17.0 × 20.0 RC (digital) 3.5 mA 9 mA 10 mm

This array of IR LED/phototransistor pairs is great for precisely identifying changes in contrast/reflectance (like line-detection). It operates from 2.9 V to 5.5 V and offers dimmable brightness control independent of the supply voltage. In general, the closer the object, the higher the contrast between light and dark, but high-reflectance objects are generally detectable out to around 50 mm. This version features high-performance, low-current QTRX sensors with lenses.

Pololu item #: 4404
Brand: Pololu
Status: Active and Preferred 
Free add-on shipping in USA 
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:
sensors pitch size
(mm)
output max current optimal
range
LED board
4 4 mm 17.0 × 20.0 analog 3.5 mA 9 mA 10 mm

This array of IR LED/phototransistor pairs is great for precisely identifying changes in contrast/reflectance (like line-detection). It operates from 2.9 V to 5.5 V and offers dimmable brightness control independent of the supply voltage. In general, the closer the object, the higher the contrast between light and dark, but high-reflectance objects are generally detectable out to around 50 mm. This version features high-performance, low-current QTRX sensors with lenses.

Pololu item #: 4104
Brand: Pololu
Status: Active and Preferred 
Free add-on shipping in USA 
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:
sensors pitch size
(mm)
output max current optimal
range
LED board
4 4 mm 17.0 × 20.0 RC (digital) 30 mA 62 mA 5 mm

This array of IR LED/phototransistor pairs is great for precisely identifying changes in contrast/reflectance (like line-detection). It operates from 2.9 V to 5.5 V and offers dimmable brightness control independent of the supply voltage. In general, the closer the object, the higher the contrast between light and dark, but high-reflectance objects are generally detectable out to around 50 mm. This version features the traditional-style QTR sensors without lenses.

Pololu item #: 4204
Brand: Pololu
Status: Active and Preferred 
Free add-on shipping in USA 
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:
sensors pitch size
(mm)
output max current optimal
range
LED board
4 4 mm 17.0 × 20.0 analog 30 mA 62 mA 5 mm

This array of IR LED/phototransistor pairs is great for precisely identifying changes in contrast/reflectance (like line-detection). It operates from 2.9 V to 5.5 V and offers dimmable brightness control independent of the supply voltage. In general, the closer the object, the higher the contrast between light and dark, but high-reflectance objects are generally detectable out to around 50 mm. This version features the traditional-style QTR sensors without lenses.

Pololu item #: 4307
Brand: Pololu
Status: Active and Preferred 
Free add-on shipping in USA 
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:
sensors pitch size
(mm)
output max current optimal
range
LED board
7 4 mm 29.0 × 20.0 RC (digital) 3.5 mA 17 mA 10 mm

This array of IR LED/phototransistor pairs is great for precisely identifying changes in contrast/reflectance (like line-detection). It operates from 2.9 V to 5.5 V and offers dimmable brightness control independent of the supply voltage. In general, the closer the object, the higher the contrast between light and dark, but high-reflectance objects are generally detectable out to around 50 mm. This version features high-performance, low-current QTRX sensors with lenses.

Pololu item #: 4407
Brand: Pololu
Status: Active and Preferred 
Free add-on shipping in USA 
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:
sensors pitch size
(mm)
output max current optimal
range
LED board
7 4 mm 29.0 × 20.0 analog 3.5 mA 17 mA 10 mm

This array of IR LED/phototransistor pairs is great for precisely identifying changes in contrast/reflectance (like line-detection). It operates from 2.9 V to 5.5 V and offers dimmable brightness control independent of the supply voltage. In general, the closer the object, the higher the contrast between light and dark, but high-reflectance objects are generally detectable out to around 50 mm. This version features high-performance, low-current QTRX sensors with lenses.

Pololu item #: 4107
Brand: Pololu
Status: Active and Preferred 
Free add-on shipping in USA 
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:
sensors pitch size
(mm)
output max current optimal
range
LED board
7 4 mm 29.0 × 20.0 RC (digital) 30 mA 125 mA 5 mm

This array of IR LED/phototransistor pairs is great for precisely identifying changes in contrast/reflectance (like line-detection). It operates from 2.9 V to 5.5 V and offers dimmable brightness control independent of the supply voltage. In general, the closer the object, the higher the contrast between light and dark, but high-reflectance objects are generally detectable out to around 50 mm. This version features the traditional-style QTR sensors without lenses.

Pololu item #: 4207
Brand: Pololu
Status: Active and Preferred 
Free add-on shipping in USA 
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:
sensors pitch size
(mm)
output max current optimal
range
LED board
7 4 mm 29.0 × 20.0 analog 30 mA 125 mA 5 mm

This array of IR LED/phototransistor pairs is great for precisely identifying changes in contrast/reflectance (like line-detection). It operates from 2.9 V to 5.5 V and offers dimmable brightness control independent of the supply voltage. In general, the closer the object, the higher the contrast between light and dark, but high-reflectance objects are generally detectable out to around 50 mm. This version features the traditional-style QTR sensors without lenses.

Pololu item #: 961
Brand: Pololu
Status: Active and Preferred 
Free add-on shipping in USA 
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:

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.

Pololu item #: 960
Brand: Pololu
Status: Active and Preferred 
Free add-on shipping in USA 
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:

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 analog voltage output.

Pololu item #: 2457
Brand: Pololu
Status: Active and Preferred 
Free add-on shipping in USA 
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:

This compact module packs three IR LED/phototransistor pairs onto a 1.25″ × 0.3″ board. The sensors are mounted on a 0.375″ pitch, allowing this array to be used as a minimal detector for a line-following robot. Each sensor provides a separate digital I/O-measurable voltage output.

Pololu item #: 2456
Brand: Pololu
Status: Active and Preferred 
Free add-on shipping in USA 
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:

This compact module packs three IR LED/phototransistor pairs onto a 1.25″ × 0.3″ board. The sensors are mounted on a 0.375″ pitch, making this array a great minimal sensing solution for a line-following robot. Each sensor provides a separate analog voltage output.

Pololu item #: 2459
Brand: Pololu
Status: Active and Preferred 
Free add-on shipping in USA 
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:

The QTR-1RC reflectance sensor carries a single infrared LED and phototransistor pair in an inexpensive, tiny 0.5" x 0.3" module that can be mounted almost anywhere and is great for edge detection and line following. The output is designed to be measured by a digital I/O line. This sensor is sold in packs of two units.

Pololu item #: 2458
Brand: Pololu
Status: Active and Preferred 
Free add-on shipping in USA 
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:

The QTR-1A reflectance sensor carries a single infrared LED and phototransistor pair in an inexpensive, tiny 0.5" x 0.3" module that can be mounted almost anywhere and is great for edge detection and line following. The reflectance measurement is output as an analog voltage. This sensor is sold in packs of two units.

Pololu item #: 2455
Brand: Pololu
Status: Active and Preferred 
Free add-on shipping in USA 
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:

The QTR-L-1RC reflectance sensor incorporates a right-angle infrared LED and a right-angle phototransistor in an inexpensive, tiny 0.35″ × 0.3″ module that can be mounted almost anywhere and is great for edge detection and line following. The output is designed to be measured by a digital I/O line. This sensor is sold in packs of two units.

Pololu item #: 2454
Brand: Pololu
Status: Active and Preferred 
Free add-on shipping in USA 
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:

The QTR-L-1A reflectance sensor incorporates a right-angle infrared LED and a right-angle phototransistor in an inexpensive, tiny 0.35″ × 0.3″ module that can be mounted almost anywhere and is great for edge detection and line following. The reflectance measurement is output as an analog voltage. This sensor is sold in packs of two units.

Pololu item #: 1419
Brand: Pololu
Status: Active 
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:

This reflectance sensor module is designed for use with the Zumo shield for Arduino. It has six IR LED/phototransistor pairs that can be used for line following or edge detection; each sensor provides an independent, digital I/O-measurable output. The array draws approximately 40 mA when the emitters are on, and an optional input allows the emitters to be turned off for additional sensing or power-saving options.

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