Sensors » Pololu QTR Reflectance Sensors » Medium-Density (MD) QTR Arrays »
QTRX-MD-03A Reflectance Sensor Array: 3-Channel, 8mm Pitch, Analog Output, Low Current
| pitch × sensors | size (mm) |
output | max current | optimal range |
|
|---|---|---|---|---|---|
| LED | board | ||||
| 8 mm × 3 | 21.0 × 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.
Alternatives available with variations in these parameter(s):
sensor type sensor count
| Description | Specs (15) | Pictures (7) | Resources (6) | 啊哼～可以随时c的世界 (24) |
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Documentation and other information
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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.
File downloads
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Schematic diagrams of the QTR/QTRX/QTRXL Reflectance Sensor Arrays (288k pdf)
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Dimension diagrams of the QTR/QTRX Reflectance Sensor Arrays (2MB pdf)
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3D models (STEP) of the QTR/QTRX Reflectance Sensor Arrays (51MB zip)
This file contains 3D models (in the step file format) of the QTR and QTRX Reflectance Sensor Arrays.
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Drill guides (DXF) for the QTR/QTRX Reflectance Sensor Arrays (88k zip)
These DXF drawings show the locations of all of the holes on the QTR and QTRX Reflectance Sensor Arrays.
Recommended links
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Arduino library for the Pololu QTR Reflectance Sensors
This library for Arduino makes it easy to interface with Pololu QTR Reflectance Sensors.
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