Products
Categories
- Main categories
-
- 3D PRINTING
- ACADEMIC OFFER
- ARDUINO
- AUTOMATION
- BOOKS
- DIY KITS
- AVT kits
- Audio
- Car
- Chargers
- Clocks, timers and schedule switches
- Communication
- Converters
- Development kits and modules
- Displays
- Electronic games
- Generators
- Hobbies and fun
- House
- Interfaces
- Light effects
- meters
- PC
- Power Supplies
- Pre-programmed circuits
- Printed circuit boards (PCB)
- Programmers
- Regulators, controllers
- Remote control
- Starter sets Ośla Łączka
- Starting sets for beginners
- Workshop tools
- Audio
- Other sets
- TOP-Q kits
- Totem
- UGears
- Velleman
- AVT kits
- EBOOKS
- ELECTRONICS
- Cables
- Cameras and accessories
- Communication
- Conductive materials
- Connectors
- ARK connectors (Terminal Block)
- Coaxial connectors (RF)
- Connectors
- Crocodile clip
- D-Sub drawer connectors
- DC power connectors
- FFC/FPC ZIF connectors
- Goldpin connectors
- IDC connectors
- JACK connectors
- JST connectors
- Jumpers
- Memory cards slots
- Other connectors
- Pogo pin
- RJ45 sockets
- Slip ring connector
- Supports
- Szybkozłącza
- USB connectors
- Cooling
- Displays
- Electronic modules
- A/D and D/A converters
- Audio
- Barcode readers
- CAN converters
- Converters USB - UART / RS232
- Data logger
- DDS/PLL generators
- Digital potentiometers
- Encoders
- Expanders of the I/O
- Fingerprint readers
- HMI modules
- Image and video
- JTAG accessories
- Keyboards, buttons
- LED drivers
- Memory card readers
- Memory modules
- Modules with power outputs
- Motor controllers
- Power modules
- RS485 converters
- RTC modules
- Servo Controllers
- TSOP infrared receivers
- USB Converters - I2C / 1-Wire / SPI
- Voltage converters
- Gadgets
- GPS
- Intelligent clothes
- LED - diodes, displays, stripes
- Luminous wires and accessories
- Memory cards and other data storages
- Passive elements
- PC accessories
- Printers
- Prototype boards
- Semiconductors
- A/C converters (ADC)
- Analog systems
- Audio systems
- Bridge rectifiers
- Button
- D/A Converters (DAC)
- DDS synthesizers
- Digital circuits
- Diodes
- Drivers of motors
- DSP microprocessors
- Energy counters
- Energy harvesting
- ESD security
- IGBT drivers and bridges
- Interface systems
- LED drivers
- Logic converters
- Memory
- Microcontrollers
- Optotriacs and optocouplers
- Other
- PLL generators
- Power systems
- Programmable systems
- Resetting systems
- RF systems
- RTC systems
- Sensors
- SoC systems
- Timery
- Touch sensors
- Transistors
- Sensors
- Accelerometers
- Air humidity sensors
- Air quality sensors
- Current sensors
- Distance sensors
- Flow sensors
- Gas sensors
- Gyroscopes
- Hall sensors
- Humidity sensors
- Infrared sensors
- Light and color sensors
- Liquid level sensors
- Magnetic sensors (compasses)
- Medical sensors
- Motion sensors
- PH sensors
- Position sensors
- Pressure sensors
- Pressure sensors
- Reflection sensors
- Sensors 6DOF/9DOF/10DOF
- Sensors of liquid quality
- Temperature sensors
- Vibration sensors
- Sound transducers
- Switches and buttons
- Cables
- INTERNET OF THINGS (IoT)
- MECHANICS
- POWER
- R/C MODELLING
- RASPBERRY PI
- Accessories for Raspberry Pi
- Audio video cables for Raspberry Pi
- Case Raspberry Pi
- Cooling for Raspberry Pi
- Displays for Raspberry Pi
- Extension modules for Raspberry Pi
- Memory cards for Raspberry Pi
- Power for Raspberry Pi
- Raspberry Pi 3 model A+
- Raspberry Pi 3 model B
- Raspberry Pi 3 model B+
- Raspberry Pi 4 model B
- Raspberry Pi 400
- Raspberry Pi 5
- Raspberry Pi cameras
- Raspberry Pi Compute Module
- Raspberry Pi model A/ B+/2
- Raspberry Pi Pico
- Raspberry Pi prototyping
- Raspberry Pi Zero
- Raspberry Pi Zero 2 W
- RETIRED PRODUCTS
- ROBOTICS
- SALE
- SOFTWARE
- STARTER KITS, PROGRAMMERS, MODULES
- Alchitry FPGA
- Altera FPGA
- Analog electronics
- Atmel SAM
- Atmel Xplain
- AVR
- Banana Pi
- BeagleBone
- chipKIT
- Coral
- CPLD Xilinx
- Cubieboard
- DFRobot FireBeetle
- Feather
- Freedom (Kinetis)
- FriendlyELEC
- HummingBoard
- Intelligent clothes
- Kit with a book
- LattePanda
- LPC (NXP)
- M5Stack
- Micro:bit
- Nvidia Jetson
- Odroid
- ODYSSEY
- Orange Pi
- Other development kits
- Peripheral modules
- PIC
- Raisonance
- Raspberry Pi RP2040
- RFID
- RISC-V
- SBC Embest
- SBC MYIR
- SBC others
- SBC UDOO
- Segger programmers
- SoMLabs
- Sparkfun MicroMod
- STM32
- STM32 Discovery
- STM32 MP1
- STM32 Nucleo boards
- STM8
- Teensy
- Universal programmers
- WRTNode
- Xilinx FPGAs
- WORKSHOP
- Adhesives and gluers
- Anti-static mats (ESD)
- Chemistry
- CNC milling machines
- Crimping tools
- Dispensing needles
- Drills
- Files
- Generators
- Handles, magnifiers
- Heat-shrink tubing
- Insulation strippers
- Keys
- Knives and scissors
- Laboratory power supplies
- Laminates
- Measuring devices
- Mikroskopy
- Mini drills and grindrers
- Organizers
- Oscilloscopes and accessories
- Pliers and pincers
- Power tools
- Riveting tools and rivets
- Screwdrivers
- SMD Accessories
- Soldering
- Tapes (aluminum, kapton, copper, insulating)
- Tweezers
- Ultrasonic cleaners
- Vices
- 3D PRINTING
New products
New products
zł25.19 tax excl.
QTR-3A Reflectance Sensor Array
Free shipping
free shipping in Poland for all orders over 500 PLN
Same day shipping
If your payment will be credited to our account by 11:00
14 days for return
Each consumer can return the purchased goods within 14 days
QTR-3A Reflectance Sensor Array
This compact module packs three IR LED/phototransistor pairs onto a 1.25" A— 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.
The QTR-3A reflectance sensor array requires analog inputs to take readings. The similar QTR-3RC reflectance sensor array is available with digital I/O-compatible outputs.
Functional Description
The QTR-3A 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 three IR emitter and receiver (phototransistor) pairs. With sensors spaced at intervals of 0.375" (9.525 mm) along of the board’s longer axis, this array works well as a minimal detector for line-following robots, as line-following courses are commonly made using 3/4" (19 mm) black electrical tape. The middle sensor is slightly offset along the short axis of the board.
Each phototransistor is connected to a pull-up resistor to form a voltage divider that produces an analog voltage output between 0 V and VCC (which is typically 5 V) as a function of the reflected IR. Lower output voltage is an indication of greater reflection.
The LED current-limiting resistors are set to deliver approximately 17 mA to the LEDs when VCC is 5 V, making the total board consumption just over 50 mA. The schematic diagram of the module is shown below:
This schematic is also available as a downloadable pdf (115k pdf).
For an alternative array with eight sensors and the ability to turn off the IR LEDs to limit power consumption, consider our QTR-8A reflectance sensor array. For individual reflectance sensors, consider our QTR-1A and QTR-L-1A.
QTR sensor size comparison. Clockwise from top left: QTR-3RC, QTR-1RC, QTR-L-1RC, QTR-8RC. |
---|
Specifications
- Dimensions: 1.25" A— 0.3" A— 0.1" (32 A— 8 A— 3 mm) (without header pins installed)
- Operating voltage: 5.0 V
- Supply current: 50 mA
- Output format: 3 analog voltages
- Output voltage range: 0 V to supplied voltage
- Optimal sensing distance: 0.125" (3 mm)
- Maximum recommended sensing distance: 0.25" (6 mm)
- Weight without header pins: 0.02 oz (0.6 g)
Interfacing with the QTR-3A Outputs
There are several ways you can interface with the QTR-3A outputs:
- Use a microcontroller’s analog-to-digital converter (ADC) to measure the voltages.
- Use a comparator with an adjustable threshold to convert each analog voltage into a digital (i.e. black/white) signal that can be read by the digital I/O line of a microcontroller.
- Connect each output directly to a digital I/O line of a microcontroller and rely upon its internal comparator.
This last method will work if you are able to get high reflectance from your white surface as depicted in the left image, but will probably fail if you have a lower-reflectance signal profile like the one on the right. (Please note that these images show the output of a QTR-1A, which uses a sensor with slightly different characteristics than the ones on the QTR-3A.)
|
|
Our Pololu AVR library provides functions that make it easy to use these sensors with our Orangutan robot controllers; please see the QTR Reflectance Sensors section of our library command reference for more information. We also have a Arduino library for these sensors.
Included Components
This module has two mounting holes intended for #2 screws (not included); if the mounting holes are not needed, the ends of the PCB can be ground off to make the unit even smaller (less than 1" wide). The reflectance sensor array ships with a 1A—5 straight male header strip and a1A—5 right-angle male header strip as shown below. You can also solder wires, such as ribbon cable, directly to the pads for the smallest installation.
|
|
People often buy this product together with:
QTR-8A Reflectance Sensor Array |
Tamiya 70168 Double Gearbox Kit |
Other products in the same category (16)
Module with 5 balancing sensors for Balboa 32U4 balancing robot. Pololu 3577
Reflection sensor module with 1 QTRXL-HD optocoupler with analogue output. The module is powered by 2.9 ... 5.5V voltage, detects objects at a distance of up to 80mm. Pololu 4641
Module with 1 QTRX type optocoupler with analog output. The module operates from 2.9 V to 5.5 V, detects objects at a distance of up to 30 mm. The sensor will be used in projects that require detection of changes in the ground, e.g. in linefollower robots. Pololu 4401
Module with 4 QTRX type optocoupler with analog output. The module operates from 2.9 V to 5.5 V, detects objects at a distance of up to 40 mm. The sensor will be used in projects that require detection of changes in the ground, e.g. in linefollower robots. Pololu 4444
Module with 25 QTRX type optocoupler with analog output. The module operates from 2.9 V to 5.5 V, detects objects at a distance of up to 50 mm. The sensor will be used in projects that require detection of changes in the ground, e.g. in linefollower robots. Pololu 4425
Module with 9 QTR type optocoupler with RC (digital) output. The module operates from 2.9 V to 5.5 V, detects objects at a distance of up to 40 mm. The sensor will be used in projects that require detection of changes in the ground, e.g. in linefollower robots. Pololu 4109
Module with an analog IR reflective sensor. It consists of an IR diode and a phototransistor which measures the intensity of the reflected light. Used, among others in line tracking robots. Cytron MAKER-REFLECT
Module with 3 QTR type optocoupler with analog output. The module operates from 2.9 V to 5.5 V, detects objects at a distance of up to 30 mm. The sensor will be used in projects that require detection of changes in the ground, e.g. in linefollower robots. Pololu 4243
No product available!
Module with 25 QTR type optocoupler with RC (digital) output. The module operates from 2.9 V to 5.5 V, detects objects at a distance of up to 50 mm. The sensor will be used in projects that require detection of changes in the ground, e.g. in linefollower robots. Pololu 4125
Module with 1 QTR type optocoupler with RC (digital) output. The module operates from 2.9 V to 5.5 V, detects objects at a distance of up to 30 mm. The sensor will be used in projects that require detection of changes in the ground, e.g. in linefollower robots. Pololu 4141
Module with 7 QTRX type optocoupler with analog output. The module operates from 2.9 V to 5.5 V, detects objects at a distance of up to 40 mm. The sensor will be used in projects that require detection of changes in the ground, e.g. in linefollower robots. Pololu 4407
Module with 11 QTRX type optocoupler with analog output. The module operates from 2.9 V to 5.5 V, detects objects at a distance of up to 40 mm. The sensor will be used in projects that require detection of changes in the ground, e.g. in linefollower robots. Pololu 4411
Module with 4 QTRX type optocoupler with RC (digital) output. The module operates from 2.9 V to 5.5 V, detects objects at a distance of up to 40 mm. The sensor will be used in projects that require detection of changes in the ground, e.g. in linefollower robots. Pololu 4344
Module with 16 QTR type optocoupler with RC (digital) output. The module operates from 2.9 V to 5.5 V, detects objects at a distance of up to 50 mm. The sensor will be used in projects that require detection of changes in the ground, e.g. in linefollower robots. Pololu 4156
Module with 6 QTRX type optocoupler with RC (digital) output. The module operates from 2.9 V to 5.5 V, detects objects at a distance of up to 40 mm. The sensor will be used in projects that require detection of changes in the ground, e.g. in linefollower robots. Pololu 4346
Module with 5 QTR type optocoupler with analog output. The module operates from 2.9 V to 5.5 V, detects objects at a distance of up to 40 mm. The sensor will be used in projects that require detection of changes in the ground, e.g. in linefollower robots. Pololu 4245