High-Density (HD) QTR Arrays

These reflectance sensors feature a linear array of IR emitter/phototransistor pair modules that are well suited for applications that require detection of changes in reflectivity. This change in reflectivity can be due to a color change at a fixed distance, such as when sensing a black line on a white background, as well as due to a change in the distance to or presence of an object in front of the sensor. A variety of sensor counts and densities is available so you can pick the ideal arrangement for your application. Since the outputs are all independent, you can connect just some of the channels to attain an irregular or non-standard sensor spacing.

The following tables show all of the QTR/QTRX reflectance sensor arrays with IR emitter/phototransistor pair modules that are arranged in a high-density (HD), 4 mm pitch. We also have medium-density (MD) versions available with sensors arranged on an 8 mm pitch.

QTR sensors
2.9 V to 5.5 V; 30 mA max LED current(1); 5 mm optimal range
Board
width
Configuration Max board
current(2)
Max range Output
type
Name 1-piece
price
5.0 mm 1 sensor (HD)
32 mA 30 mm analog QTR-HD-01A $1.79
RC (digital) QTR-HD-01RC
10.2 mm 4 mm × 2
32 mA 30 mm analog QTR-HD-02A $2.12
RC (digital) QTR-HD-02RC
13.0 mm 4 mm × 3
62 mA 30 mm analog QTR-HD-03A $2.69
RC (digital) QTR-HD-03RC
17.0 mm 4 mm × 4
62 mA 40 mm analog QTR-HD-04A $3.26
RC (digital) QTR-HD-04RC
21.0 mm 4 mm × 5
93 mA 40 mm analog QTR-HD-05A $4.26
RC (digital) QTR-HD-05RC
25.0 mm 4 mm × 6
93 mA 40 mm analog QTR-HD-06A $4.83
RC (digital) QTR-HD-06RC
29.0 mm 4 mm × 7
125 mA 40 mm analog QTR-HD-07A $5.40
RC (digital) QTR-HD-07RC
37.0 mm 4 mm × 9
155 mA 40 mm analog QTR-HD-09A $6.97
RC (digital) QTR-HD-09RC
45.0 mm 4 mm × 11
185 mA 40 mm analog QTR-HD-11A $8.54
RC (digital) QTR-HD-11RC
61.0 mm 4 mm × 15
250 mA 50 mm analog QTR-HD-15A $10.82
RC (digital) QTR-HD-15RC
125.0 mm 4 mm × 31
495 mA 50 mm analog QTR-HD-31A $21.66
RC (digital) QTR-HD-31RC
QTRX sensors
2.9 V to 5.5 V; 3.5 mA max LED current(1); 10 mm optimal range
Board
width
Configuration Max board
current(2)
Max range Output
type
Name 1-piece
price
5.0 mm 1 sensor (HD)
5 mA 30 mm analog QTRX-HD-01A $2.17
RC (digital) QTRX-HD-01RC
10.2 mm 4 mm × 2
5 mA 30 mm analog QTRX-HD-02A $2.88
RC (digital) QTRX-HD-02RC
13.0 mm 4 mm × 3
9 mA 30 mm analog QTRX-HD-03A $3.83
RC (digital) QTRX-HD-03RC
17.0 mm 4 mm × 4
9 mA 40 mm analog QTRX-HD-04A $4.78
RC (digital) QTRX-HD-04RC
21.0 mm 4 mm × 5
14 mA 40 mm analog QTRX-HD-05A $6.16
RC (digital) QTRX-HD-05RC
25.0 mm 4 mm × 6
14 mA 40 mm analog QTRX-HD-06A $7.11
RC (digital) QTRX-HD-06RC
29.0 mm 4 mm × 7
17 mA 40 mm analog QTRX-HD-07A $8.06
RC (digital) QTRX-HD-07RC
37.0 mm 4 mm × 9
22 mA 40 mm analog QTRX-HD-09A $10.39
RC (digital) QTRX-HD-09RC
45.0 mm 4 mm × 11
26 mA 40 mm analog QTRX-HD-11A $12.72
RC (digital) QTRX-HD-11RC
61.0 mm 4 mm × 15
34 mA 50 mm analog QTRX-HD-15A $16.52
RC (digital) QTRX-HD-15RC
125.0 mm 4 mm × 31
68 mA 50 mm analog QTRX-HD-31A $33.44
RC (digital) QTRX-HD-31RC
QTRXL sensors
2.9 V to 5.5 V; 30 mA max LED current(1); 20 mm optimal range
Board
width
Configuration Max board
current(2)
Max range Output
type
Name 1-piece
price
5.0 mm 1 sensor (HD)
32 mA 80 mm analog QTRXL-HD-01A $2.17
RC (digital) QTRXL-HD-01RC
1 Can be dynamically reduced to any of 32 available dimming levels.
2 With all LEDs on at max brightness setting.

These modules all operate from 2.9 V to 5.5 V and offer dimmable brightness control independent of the supply voltage, and units with five or more sensors provide separate controls for the odd-numbered and even-numbered LEDs, which gives you extra options for detecting light reflected at various angles. Two different sensor options are available, denoted by “QTR” or “QTRX” in the product name. The “QTR” versions feature lower-cost sensor modules without lenses while the “QTRX” versions feature higher-performance sensor modules with lenses, which allow similar performance at a much lower IR LED current. We also have several single-channel modules with the “QTRXL” designator that offer extra-long range by using the QTRX-style sensor module with higher current through the emitter.

Each sensor option is available in two output types: an “A” version with analog voltage outputs between 0 V and VCC, and an “RC” version with outputs that can be read with a digital I/O line on a microcontroller by first setting the lines high and then releasing them and timing how long it takes them to read as low (typically anywhere from a few microseconds to a few milliseconds).

Schematic diagrams of individual QTR sensor channels for A version (left) and RC version (right). This applies only to the newer QTRs with dimmable emitters.

Products in category “High-Density (HD) QTR Arrays”

Pololu item #: 4501
Brand: Pololu
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Quantity:
sensors size
(mm)
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range
LED board
1 5.0 × 20.0 RC (digital) 30 mA 32 mA 20 mm

This IR LED/phototransistor pair is great for precisely identifying changes in 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 readings, but high-reflectance objects are generally detectable out to around 80 mm. This version features a high-performance QTRXL sensor with lenses and a high-brightness emitter for extra-long range.

Pololu item #: 4601
Brand: Pololu
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Out of stock.
Quantity:
sensors size
(mm)
output max current optimal
range
LED board
1 5.0 × 20.0 analog 30 mA 32 mA 20 mm

This IR LED/phototransistor pair is great for precisely identifying changes in 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 readings, but high-reflectance objects are generally detectable out to around 80 mm. This version features a high-performance QTRXL sensor with lenses and a high-brightness emitter for extra-long range.

Pololu item #: 4301
Brand: Pololu
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Quantity:
sensors size
(mm)
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range
LED board
1 5.0 × 20.0 RC (digital) 3.5 mA 5 mA 10 mm

This IR LED/phototransistor pair is great for precisely identifying changes in 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 readings, but high-reflectance objects are generally detectable out to around 30 mm. This version features a high-performance, low-current QTRX sensor with lenses.

Pololu item #: 4401
Brand: Pololu
Status: Active and Preferred 
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Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:
sensors size
(mm)
output max current optimal
range
LED board
1 5.0 × 20.0 analog 3.5 mA 5 mA 10 mm

This IR LED/phototransistor pair is great for precisely identifying changes in 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 readings, but high-reflectance objects are generally detectable out to around 30 mm. This version features a high-performance, low-current QTRX sensor with lenses.

Pololu item #: 4101
Brand: Pololu
Status: Active and Preferred 
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Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:
sensors size
(mm)
output max current optimal
range
LED board
1 5.0 × 20.0 RC (digital) 30 mA 32 mA 5 mm

This IR LED/phototransistor pair is great for precisely identifying changes in 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 readings, but high-reflectance objects are generally detectable out to around 30 mm. This version features a traditional-style QTR sensor without lenses.

Pololu item #: 4201
Brand: Pololu
Status: Active and Preferred 
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Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:
sensors size
(mm)
output max current optimal
range
LED board
1 5.0 × 20.0 analog 30 mA 32 mA 5 mm

This IR LED/phototransistor pair is great for precisely identifying changes in 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 readings, but high-reflectance objects are generally detectable out to around 30 mm. This version features a traditional-style QTR sensor without lenses.

Pololu item #: 4302
Brand: Pololu
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Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:
pitch × sensors size
(mm)
output max current optimal
range
LED board
4 mm × 2 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 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 readings, but high-reflectance objects are generally detectable out to around 30 mm. This version features high-performance, low-current QTRX sensors with lenses.

Pololu item #: 4402
Brand: Pololu
Status: Active and Preferred 
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Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:
pitch × sensors size
(mm)
output max current optimal
range
LED board
4 mm × 2 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 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 readings, but high-reflectance objects are generally detectable out to around 30 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 
This item could qualify for free shipping Free shipping in USA over $40 
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:
pitch × sensors size
(mm)
output max current optimal
range
LED board
4 mm × 2 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 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 readings, but high-reflectance objects are generally detectable out to around 30 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 
This item could qualify for free shipping Free shipping in USA over $40 
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:
pitch × sensors size
(mm)
output max current optimal
range
LED board
4 mm × 2 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 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 readings, but high-reflectance objects are generally detectable out to around 30 mm. This version features the traditional-style QTR sensors without lenses.

Pololu item #: 4103
Brand: Pololu
Status: Active and Preferred 
 Free add-on shipping in USA 
This item could qualify for free shipping Free shipping in USA over $40 
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:
pitch × sensors size
(mm)
output max current optimal
range
LED board
4 mm × 3 13.0 × 20.0 RC (digital) 30 mA 62 mA 5 mm

This array of IR LED/phototransistor pairs is great for precisely identifying changes in 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 readings, but high-reflectance objects are generally detectable out to around 30 mm. This version features the traditional-style QTR sensors without lenses.

Pololu item #: 4203
Brand: Pololu
Status: Active and Preferred 
 Free add-on shipping in USA 
This item could qualify for free shipping Free shipping in USA over $40 
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:
pitch × sensors size
(mm)
output max current optimal
range
LED board
4 mm × 3 13.0 × 20.0 analog 30 mA 62 mA 5 mm

This array of IR LED/phototransistor pairs is great for precisely identifying changes in 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 readings, but high-reflectance objects are generally detectable out to around 30 mm. This version features the traditional-style QTR sensors without lenses.

Pololu item #: 4303
Brand: Pololu
Status: Active and Preferred 
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This item could qualify for free shipping Free shipping in USA over $40 
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:
pitch × sensors size
(mm)
output max current optimal
range
LED board
4 mm × 3 13.0 × 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 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 readings, but high-reflectance objects are generally detectable out to around 30 mm. This version features high-performance, low-current QTRX sensors with lenses.

Pololu item #: 4403
Brand: Pololu
Status: Active and Preferred 
 Free add-on shipping in USA 
This item could qualify for free shipping Free shipping in USA over $40 
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:
pitch × sensors size
(mm)
output max current optimal
range
LED board
4 mm × 3 13.0 × 20.0 analog 3.5 mA 9 mA 10 mm

This array of IR LED/phototransistor pairs is great for precisely identifying changes in 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 readings, but high-reflectance objects are generally detectable out to around 30 mm. This version features high-performance, low-current QTRX sensors with lenses.

Pololu item #: 4304
Brand: Pololu
Status: Active and Preferred 
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This item could qualify for free shipping Free shipping in USA over $40 
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:
pitch × sensors size
(mm)
output max current optimal
range
LED board
4 mm × 4 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 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 readings, but high-reflectance objects are generally detectable out to around 40 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 
This item could qualify for free shipping Free shipping in USA over $40 
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:
pitch × sensors size
(mm)
output max current optimal
range
LED board
4 mm × 4 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 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 readings, but high-reflectance objects are generally detectable out to around 40 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 
This item could qualify for free shipping Free shipping in USA over $40 
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:
pitch × sensors size
(mm)
output max current optimal
range
LED board
4 mm × 4 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 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 readings, but high-reflectance objects are generally detectable out to around 40 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 
This item could qualify for free shipping Free shipping in USA over $40 
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:
pitch × sensors size
(mm)
output max current optimal
range
LED board
4 mm × 4 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 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 readings, but high-reflectance objects are generally detectable out to around 40 mm. This version features the traditional-style QTR sensors without lenses.

Pololu item #: 4305
Brand: Pololu
Status: Active and Preferred 
 Free add-on shipping in USA 
This item could qualify for free shipping Free shipping in USA over $40 
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:
pitch × sensors size
(mm)
output max current optimal
range
LED board
4 mm × 5 21.0 × 20.0 RC (digital) 3.5 mA 14 mA 10 mm

This array of IR LED/phototransistor pairs is great for precisely identifying changes in 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 readings, but high-reflectance objects are generally detectable out to around 40 mm. This version features high-performance, low-current QTRX sensors with lenses.

Pololu item #: 4405
Brand: Pololu
Status: Active and Preferred 
 Free add-on shipping in USA 
This item could qualify for free shipping Free shipping in USA over $40 
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:
pitch × sensors size
(mm)
output max current optimal
range
LED board
4 mm × 5 21.0 × 20.0 analog 3.5 mA 14 mA 10 mm

This array of IR LED/phototransistor pairs is great for precisely identifying changes in 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 readings, but high-reflectance objects are generally detectable out to around 40 mm. This version features high-performance, low-current QTRX sensors with lenses.

Pololu item #: 4105
Brand: Pololu
Status: Active and Preferred 
 Free add-on shipping in USA 
This item could qualify for free shipping Free shipping in USA over $40 
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:
pitch × sensors size
(mm)
output max current optimal
range
LED board
4 mm × 5 21.0 × 20.0 RC (digital) 30 mA 93 mA 5 mm

This array of IR LED/phototransistor pairs is great for precisely identifying changes in 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 readings, but high-reflectance objects are generally detectable out to around 40 mm. This version features the traditional-style QTR sensors without lenses.

Pololu item #: 4205
Brand: Pololu
Status: Active and Preferred 
 Free add-on shipping in USA 
This item could qualify for free shipping Free shipping in USA over $40 
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:
pitch × sensors size
(mm)
output max current optimal
range
LED board
4 mm × 5 21.0 × 20.0 analog 30 mA 93 mA 5 mm

This array of IR LED/phototransistor pairs is great for precisely identifying changes in 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 readings, but high-reflectance objects are generally detectable out to around 40 mm. This version features the traditional-style QTR sensors without lenses.

Pololu item #: 4306
Brand: Pololu
Status: Active and Preferred 
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This item could qualify for free shipping Free shipping in USA over $40 
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:
pitch × sensors size
(mm)
output max current optimal
range
LED board
4 mm × 6 25.0 × 20.0 RC (digital) 3.5 mA 14 mA 10 mm

This array of IR LED/phototransistor pairs is great for precisely identifying changes in 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 readings, but high-reflectance objects are generally detectable out to around 40 mm. This version features high-performance, low-current QTRX sensors with lenses.

Pololu item #: 4406
Brand: Pololu
Status: Active and Preferred 
 Free add-on shipping in USA 
This item could qualify for free shipping Free shipping in USA over $40 
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:
pitch × sensors size
(mm)
output max current optimal
range
LED board
4 mm × 6 25.0 × 20.0 analog 3.5 mA 14 mA 10 mm

This array of IR LED/phototransistor pairs is great for precisely identifying changes in 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 readings, but high-reflectance objects are generally detectable out to around 40 mm. This version features high-performance, low-current QTRX sensors with lenses.

Pololu item #: 4106
Brand: Pololu
Status: Active and Preferred 
 Free add-on shipping in USA 
This item could qualify for free shipping Free shipping in USA over $40 
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:
pitch × sensors size
(mm)
output max current optimal
range
LED board
4 mm × 6 25.0 × 20.0 RC (digital) 30 mA 93 mA 5 mm

This array of IR LED/phototransistor pairs is great for precisely identifying changes in 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 readings, but high-reflectance objects are generally detectable out to around 40 mm. This version features the traditional-style QTR sensors without lenses.

Pololu item #: 4206
Brand: Pololu
Status: Active and Preferred 
 Free add-on shipping in USA 
This item could qualify for free shipping Free shipping in USA over $40 
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:
pitch × sensors size
(mm)
output max current optimal
range
LED board
4 mm × 6 25.0 × 20.0 analog 30 mA 93 mA 5 mm

This array of IR LED/phototransistor pairs is great for precisely identifying changes in 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 readings, but high-reflectance objects are generally detectable out to around 40 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 
This item could qualify for free shipping Free shipping in USA over $40 
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:
pitch × sensors size
(mm)
output max current optimal
range
LED board
4 mm × 7 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 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 readings, but high-reflectance objects are generally detectable out to around 40 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 
This item could qualify for free shipping Free shipping in USA over $40 
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:
pitch × sensors size
(mm)
output max current optimal
range
LED board
4 mm × 7 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 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 readings, but high-reflectance objects are generally detectable out to around 40 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 
This item could qualify for free shipping Free shipping in USA over $40 
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:
pitch × sensors size
(mm)
output max current optimal
range
LED board
4 mm × 7 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 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 readings, but high-reflectance objects are generally detectable out to around 40 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 
This item could qualify for free shipping Free shipping in USA over $40 
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:
pitch × sensors size
(mm)
output max current optimal
range
LED board
4 mm × 7 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 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 readings, but high-reflectance objects are generally detectable out to around 40 mm. This version features the traditional-style QTR sensors without lenses.

Pololu item #: 4109
Brand: Pololu
Status: Active and Preferred 
 Free add-on shipping in USA 
This item could qualify for free shipping Free shipping in USA over $40 
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:
pitch × sensors size
(mm)
output max current optimal
range
LED board
4 mm × 9 37.0 × 20.0 RC (digital) 30 mA 155 mA 5 mm

This array of IR LED/phototransistor pairs is great for precisely identifying changes in 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 readings, but high-reflectance objects are generally detectable out to around 40 mm. This version features the traditional-style QTR sensors without lenses.

Pololu item #: 4209
Brand: Pololu
Status: Active and Preferred 
 Free add-on shipping in USA 
This item could qualify for free shipping Free shipping in USA over $40 
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:
pitch × sensors size
(mm)
output max current optimal
range
LED board
4 mm × 9 37.0 × 20.0 analog 30 mA 155 mA 5 mm

This array of IR LED/phototransistor pairs is great for precisely identifying changes in 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 readings, but high-reflectance objects are generally detectable out to around 40 mm. This version features the traditional-style QTR sensors without lenses.

Pololu item #: 4309
Brand: Pololu
Status: Active and Preferred 
 Free add-on shipping in USA 
This item could qualify for free shipping Free shipping in USA over $40 
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:
pitch × sensors size
(mm)
output max current optimal
range
LED board
4 mm × 9 37.0 × 20.0 RC (digital) 3.5 mA 22 mA 10 mm

This array of IR LED/phototransistor pairs is great for precisely identifying changes in 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 readings, but high-reflectance objects are generally detectable out to around 40 mm. This version features high-performance, low-current QTRX sensors with lenses.

Pololu item #: 4409
Brand: Pololu
Status: Active and Preferred 
 Free add-on shipping in USA 
This item could qualify for free shipping Free shipping in USA over $40 
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:
pitch × sensors size
(mm)
output max current optimal
range
LED board
4 mm × 9 37.0 × 20.0 analog 3.5 mA 22 mA 10 mm

This array of IR LED/phototransistor pairs is great for precisely identifying changes in 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 readings, but high-reflectance objects are generally detectable out to around 40 mm. This version features high-performance, low-current QTRX sensors with lenses.

Pololu item #: 4111
Brand: Pololu
Status: Active and Preferred 
 Free add-on shipping in USA 
This item could qualify for free shipping Free shipping in USA over $40 
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:
pitch × sensors size
(mm)
output max current optimal
range
LED board
4 mm × 11 45.0 × 20.0 RC (digital) 30 mA 185 mA 5 mm

This array of IR LED/phototransistor pairs is great for precisely identifying changes in 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 readings, but high-reflectance objects are generally detectable out to around 40 mm. This version features the traditional-style QTR sensors without lenses.

Pololu item #: 4211
Brand: Pololu
Status: Active and Preferred 
 Free add-on shipping in USA 
This item could qualify for free shipping Free shipping in USA over $40 
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:
pitch × sensors size
(mm)
output max current optimal
range
LED board
4 mm × 11 45.0 × 20.0 analog 30 mA 185 mA 5 mm

This array of IR LED/phototransistor pairs is great for precisely identifying changes in 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 readings, but high-reflectance objects are generally detectable out to around 40 mm. This version features the traditional-style QTR sensors without lenses.

Pololu item #: 4311
Brand: Pololu
Status: Active and Preferred 
 Free add-on shipping in USA 
This item could qualify for free shipping Free shipping in USA over $40 
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:
pitch × sensors size
(mm)
output max current optimal
range
LED board
4 mm × 11 45.0 × 20.0 RC (digital) 3.5 mA 26 mA 10 mm

This array of IR LED/phototransistor pairs is great for precisely identifying changes in 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 readings, but high-reflectance objects are generally detectable out to around 40 mm. This version features high-performance, low-current QTRX sensors with lenses.

Pololu item #: 4411
Brand: Pololu
Status: Active and Preferred 
 Free add-on shipping in USA 
This item could qualify for free shipping Free shipping in USA over $40 
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:
pitch × sensors size
(mm)
output max current optimal
range
LED board
4 mm × 11 45.0 × 20.0 analog 3.5 mA 26 mA 10 mm

This array of IR LED/phototransistor pairs is great for precisely identifying changes in 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 readings, but high-reflectance objects are generally detectable out to around 40 mm. This version features high-performance, low-current QTRX sensors with lenses.

Pololu item #: 4315
Brand: Pololu
Status: Active and Preferred 
 Free add-on shipping in USA 
This item could qualify for free shipping Free shipping in USA over $40 
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:
pitch × sensors size
(mm)
output max current optimal
range
LED board
4 mm × 15 61.0 × 20.0 RC (digital) 3.5 mA 34 mA 10 mm

This array of IR LED/phototransistor pairs is great for precisely identifying changes in 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 readings, 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 #: 4415
Brand: Pololu
Status: Active and Preferred 
 Free add-on shipping in USA 
This item could qualify for free shipping Free shipping in USA over $40 
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:
pitch × sensors size
(mm)
output max current optimal
range
LED board
4 mm × 15 61.0 × 20.0 analog 3.5 mA 34 mA 10 mm

This array of IR LED/phototransistor pairs is great for precisely identifying changes in 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 readings, 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 #: 4115
Brand: Pololu
Status: Active and Preferred 
 Free add-on shipping in USA 
This item could qualify for free shipping Free shipping in USA over $40 
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:
pitch × sensors size
(mm)
output max current optimal
range
LED board
4 mm × 15 61.0 × 20.0 RC (digital) 30 mA 250 mA 5 mm

This array of IR LED/phototransistor pairs is great for precisely identifying changes in 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 readings, but high-reflectance objects are generally detectable out to around 50 mm. This version features the traditional-style QTR sensors without lenses.

Pololu item #: 4215
Brand: Pololu
Status: Active and Preferred 
 Free add-on shipping in USA 
This item could qualify for free shipping Free shipping in USA over $40 
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:
pitch × sensors size
(mm)
output max current optimal
range
LED board
4 mm × 15 61.0 × 20.0 analog 30 mA 250 mA 5 mm

This array of IR LED/phototransistor pairs is great for precisely identifying changes in 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 readings, but high-reflectance objects are generally detectable out to around 50 mm. This version features the traditional-style QTR sensors without lenses.

Pololu item #: 4331
Brand: Pololu
Status: Active and Preferred 
 Free add-on shipping in USA 
This item could qualify for free shipping Free shipping in USA over $40 
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:
pitch × sensors size
(mm)
output max current optimal
range
LED board
4 mm × 31 125.0 × 16.5 RC (digital) 3.5 mA 68 mA 10 mm

This array of IR LED/phototransistor pairs is great for precisely identifying changes in 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 readings, 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 #: 4431
Brand: Pololu
Status: Active and Preferred 
 Free add-on shipping in USA 
This item could qualify for free shipping Free shipping in USA over $40 
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:
pitch × sensors size
(mm)
output max current optimal
range
LED board
4 mm × 31 125.0 × 16.5 analog 3.5 mA 68 mA 10 mm

This array of IR LED/phototransistor pairs is great for precisely identifying changes in 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 readings, 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 #: 4231
Brand: Pololu
Status: Active and Preferred 
 Free add-on shipping in USA 
This item could qualify for free shipping Free shipping in USA over $40 
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:
pitch × sensors size
(mm)
output max current optimal
range
LED board
4 mm × 31 125.0 × 16.5 analog 30 mA 495 mA 5 mm

This array of IR LED/phototransistor pairs is great for precisely identifying changes in 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 readings, but high-reflectance objects are generally detectable out to around 50 mm. This version features the traditional-style QTR sensors without lenses.

Pololu item #: 4131
Brand: Pololu
Status: Active and Preferred 
 Free add-on shipping in USA 
This item could qualify for free shipping Free shipping in USA over $40 
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:
pitch × sensors size
(mm)
output max current optimal
range
LED board
4 mm × 31 125.0 × 16.5 RC (digital) 30 mA 495 mA 5 mm

This array of IR LED/phototransistor pairs is great for precisely identifying changes in 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 readings, but high-reflectance objects are generally detectable out to around 50 mm. This version features the traditional-style QTR sensors without lenses.

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