Description
Description
The Pololu QTR-1A Reflectance Sensor is a compact infrared reflectance module designed for line detection, edge sensing, and short-range proximity measurement. It integrates an IR LED and phototransistor that produce an analog voltage proportional to reflected light intensity. Operating at 5 V with a typical current consumption of 17 mA, the sensor delivers reliable readings for high-contrast surface detection. Its small 12.7 7.6 mm footprint allows installation in dense arrays, making it suitable for robotics, automation, and embedded sensing applications.
Features
- Infrared LED and phototransistor reflectance sensing pair
- Analog voltage output proportional to reflected IR light
- 5 V operating voltage compatible with microcontrollers
- Typical current consumption around 17 mA
- High sensitivity for line detection and contrast sensing
- Optimal sensing distance around 3 mm
- Maximum recommended detection distance up to 6 mm
- Compact 12.7 7.6 mm PCB for dense sensor arrays
- Integrated current-limiting resistor for safe LED operation
- Suitable for line follower and edge detection robots
- Direct interface with analog inputs on Arduino boards
- Supplied as 2 sensors per package
Specifications
- Operating Voltage: 5V DC
- Typical Current Consumption: 17mA
- Output Type: Analog Voltage Output
- Output Voltage Range: 0V to Supply Voltage
- Optimal Sensing Distance: 3mm
- Maximum Recommended Distance: 6mm
- IR Emitter Type: Infrared LED
- Receiver Type: Phototransistor with Pull-up Resistor
- PCB Dimensions: 12.7mm 7.6mm 2.5mm
- Mounting Orientation: Parallel to sensing surface
- Interface Type: Analog Input (ADC)
- Sensor Weight: 0.2g per sensor
- Pack Quantity: 2 Sensors
Links
- Pololu QTR Reflectance Sensor Application Note(pdf)
- Datasheet of Fairchild’s QRE1113GR sensor(pdf)
- 3D model from grabcad.com
- Pololu AVR library
- Arduino library
Tutorials
- Pololu QTR-1A Reflectance Sensor Tutorial
- Sensor Qtr1a-Pololu
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