Pololu QTR-8A Reflectance Sensor Array

PololuSKU: RB-Pol-51
Manufacturer #: 960

Price  :
Sale price ¥1,808

Tax included Shipping calculated at checkout

Stock  :

Re-stocking soon See due date

Notify me when this product is in stock

Payments and Security

Apple Pay Discover Mastercard PayPal Visa

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.

Description

  • Infrared phototransistor based reflectance sensor array
  • 3.3V to 5V operation
  • Measures only 2.95" x 0.5" x 0.125" and weighs 3.09 grams

The Pololu QTR-8A Reflectance Sensor Array 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 QTR-8A Reflectance Sensor Array

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.

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.

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 above. 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.

  • This module ships with a 25-pin 0.1" header strip and a 100 Ohm through-hole resistor as shown above
  • Size: 2.95'' x 0.5'' x 0.125'' (without Header Pins installed)
  • Weight without Header Pins: 0.11oz (3.09g)
  • Operating Voltage: 3.3-5.0V
  • Supply Current: 100mA
  • Output Format: 8 Analog Voltages
  • Output Voltage Range: 0V to supplied voltage
  • Optimal Sensing Distance: 0.125" (3 mm)
  • Maximum Recommended Sensing Distance: 0.25" (6 mm)

Customer Reviews

Based on 3 reviews
100%
(3)
0%
(0)
0%
(0)
0%
(0)
0%
(0)
D
Dimitrios
Really clever sensor

I have bought this product for an arduino line follower robot and its working perfect!

M
Manfred
Great product

I recommend the purchase, great product ensures excellent reading. We used it on our Wickedbotz / Brazil team line follower

M
Mauricio
Great Sensor

This sensor module has 8 IR LED/phototransistor pairs, each sensor provides a separate analog voltage output. You can break off two sensors and still use all 8 sensors as two separate modules. Really good for line follower robots.

Estimate shipping

You may also like

1
Pololu QTR-8RC 反射率センサアレイPololu QTR-8RC 反射率センサアレイ
Pololu Pololu QTR-8RC Reflectance Sensor Array

SKU: RB-Pol-52

Sale price¥1,808
Reviews

Re-stocking soon See due date

Notify me
1
Pololu QTR-1A 反射センサ (2個パック)Pololu QTR-1A 反射センサ (2個パック)
Pololu Pololu QTR-1A Reflectance Sensor (2pk)

SKU: RB-Pol-49

Sale price¥899
Reviews

Re-stocking soon See due date

Notify me
1
Pololu QTR-1RC 反射センサ(2個パック)Pololu QTR-1RC 反射センサ(2個パック)
Pololu Pololu QTR-1RC Reflectance Sensor (2pk)

SKU: RB-Pol-50

Sale price¥899
Reviews

Re-stocking soon See due date

Notify me
1On Demand
Pololu QTRX-HD-15A反射率センサアレイPololu QTRX-HD-15A反射率センサアレイ
Pololu Pololu QTRX-HD-15A Reflectance Sensor Array

SKU: RB-Pol-709

Sale price¥4,534
Reviews
1
デジタルIRラインセンサ -  QRE1113デジタルIRラインセンサ -  QRE1113
Sparkfun Electronics Digital IR Line Sensor - QRE1113

SKU: RB-Spa-436

Sale price¥636
Reviews

Re-stocking soon See due date

Notify me
1
Pololu 38 kHz IR近接センサ固定ゲイン(高輝度)Pololu 38 kHz IR近接センサ固定ゲイン(高輝度)
Pololu Pololu 38 kHz IR Proximity Sensor Fixed Gain (High Brightness)

SKU: RB-Pol-471

Sale price¥1,263
Reviews
In stock, 4 units
1
470 および 10K 抵抗付き 反射型 赤外線センサ470 および 10K 抵抗付き 反射型 赤外線センサ
Adafruit Industries Reflective IR Sensor with 470 and 10K Resistors

SKU: RB-Ada-203

Sale price¥354
Reviews

Re-stocking soon See due date

Notify me
1Save ¥274
Parallax QTI光センサーParallax QTI光センサー
Parallax Parallax QTI Light Sensor

SKU: RB-Plx-74

Sale price¥1,541 Regular price¥1,815
Reviews
Only 1 unit left
1Save ¥3,266
Boe-Bot用 ParallaxQTI ライン追跡 アプリケーションキットBoe-Bot用 ParallaxQTI ライン追跡 アプリケーションキット
Parallax Parallax QTI Line Follower AppKit for the Boe-Bot

SKU: RB-Plx-141

Sale price¥4,900 Regular price¥8,166
Reviews
Only 2 units left
1On Demand
Pololu 2.5-9.5V アジャスタブル ブースト レギュレータPololu 2.5-9.5V アジャスタブル ブースト レギュレータ
Pololu Pololu 2.5-9.5V Adjustable Boost Regulator

SKU: RB-Pol-117

Sale price¥2,716
Reviews