Sensors » Pololu QTR Reflectance Sensors » Medium-Density (MD) QTR Arrays »
QTR-MD-01A-S Reflectance Sensor: 1-Channel, 8mm Wide, Analog Output, Side-Entry Connector
| sensors | size (mm) |
output | max current | optimal range |
connector | |
|---|---|---|---|---|---|---|
| LED | board | |||||
| 1 | 8.1 × 15.2 | analog | 30 mA | 32 mA | 5 mm | side-entry |
This sensor uses an IR LED and a phototransistor to measure the light reflected from nearby surfaces. It operates from 2.9–5.5 V, with dimmable brightness control independent of the supply voltage. The optimal range is <5 mm, but it can detect high-reflectance objects out to around 30 mm. This version features a traditional-style QTR sensor without lenses and a connector that works with our 4-pin JST SH-style cables (compatible with SparkFun’s Qwiic and Adafruit’s STEMMA QT cables, but the interface is not I²C).
Alternatives available with variations in these parameter(s): sensor type sensor count sensor pitch output type Select variant…
Compare all products in Medium-Density (MD) QTR Arrays or Single-Channel QTR Reflectance Sensors.
| Description | Specs (15) | Pictures (10) | Resources (6) | FAQs (0) | On the blog (0) | Distributors (0) |
|---|
Documentation and other information
-
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
-
Schematic diagrams of the QTR/QTRX-HD Reflectance Sensor Arrays (206k pdf)
-
Dimension diagrams of the QTR/QTRX Reflectance Sensor Arrays (2MB pdf)
-
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.
-
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
-
Arduino library for the Pololu QTR Reflectance Sensors
This library for Arduino makes it easy to interface with Pololu QTR Reflectance Sensors.
Related categories
Coupon Discount
QTRSINTRO: Get 15% off one or more items from category Single-Channel QTR Reflectance Sensors (limit 5 per item). This offer is valid through 31 Oct 2025.
Home | Forum | Blog | Support | Ordering Information | Lists | Distributors | BIG Order Form | About | Contact
© 2001–2025 Pololu Corporation
