QTR-MD-08RC Reflectance Sensor Array: 8-Channel, 8mm Pitch, RC Output

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.

Details

Pinout diagram of a QTR-MD-xRC Reflectance Sensor Array.

QTR-MD-08RC Reflectance Sensor Array, front and back views.

Specifications

• Dimensions: 61.0 × 20.0 × 2.5 mm (see the dimension diagram (1MB pdf) for more details)
• Operating voltage: 2.9 V to 5.5 V
• Sensor type: QTR
• Sensor count: 8
• Sensor pitch: 8 mm
• Full-brightness LED current: 30 mA (independent of supply voltage)
• Max board current: 125 mA
• Output format: digital I/O-compatible signals that can be read in parallel as timed high pulses
• Optimal sensing distance: 5 mm
• Maximum recommended sensing distance: 40 mm
• Weight: 3.1 g

Downloads

• Pololu QTR Reflectance Sensor Application Note (Printable PDF)
  • Information about using the Pololu QTR reflectance sensors, including differences between A-type and RC-type sensors and sample oscilloscope screen captures of sensor outputs.
• Schematic diagrams of the QTR/QTRX-HD Reflectance Sensor Arrays (206k pdf)
• Dimension diagrams of the QTR/QTRX Reflectance Sensor Arrays (1MB pdf)
• 3D models (STEP) of the QTR/QTRX Reflectance Sensor Arrays (50MB zip)
  • This file contains 3D models (in the step file format) of the QTR and QTRX Reflectance Sensor Arrays.
• Drill guides (DXF) for the QTR/QTRX Reflectance Sensor Arrays (86k zip)
  • These DXF drawings show the locations of all of the holes on the QTR and QTRX Reflectance Sensor Arrays.
• Arduino library for the Pololu QTR Reflectance Sensors
  • This library for Arduino makes it easy to interface with Pololu QTR Reflectance Sensors.