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QTR-MD-01A-S IR Reflectance Sensor, 1-Channel, Analog Output, JST SH Connector - Pololu 4240
ID: 1203987
5902186335370
zł14.46
Tax included
zł11.76 tax excl.
Single-channel IR reflectance sensor using an infrared LED and phototransistor to detect changes in surface reflectivity, generating an analog output voltage from 0–VCC. Operates at 2.9–5.5 V, with an optimal sensing distance of ~5 mm (up to 30 mm max), adjustable IR emitter brightness, and a 4-pin JST SH connector, designed for line detection, edge detection, and obstacle sensing in robotics and automation projects. Pololu 4240
Description
Pololu QTR-MD-01A-S is a compact reflectance sensor designed to measure the amount of infrared light reflected from nearby surfaces. The module uses an IR emitter LED and a phototransistor, enabling detection of changes in surface reflectivity or the presence of objects located close to the sensor.
Pinout of the QTR-MD-01x-S reflectance sensor (RC version shown in the illustration; pinout identical for the analog version)
The module produces an analog output signal ranging from 0 V to VCC, which can be read directly using the ADC of a microcontroller. High reflectivity surfaces result in a lower output voltage, while lower reflectivity produces a higher output voltage. The sensor operates with a supply voltage from 2.9 V to 5.5 V, making it compatible with common microcontroller platforms such as Arduino, STM32, ESP32, and Raspberry Pi Pico. An integrated LED driver allows IR emitter brightness adjustment across 32 dimming levels, independent of the supply voltage.
The optimal sensing distance is approximately 5 mm, while highly reflective objects can be detected at distances up to about 30 mm. The lensless QTR sensor design corresponds to the classic QTR style commonly used for line-following sensors and contrast detection on surfaces. The board includes a 4-pin JST SH side-entry connector, enabling quick connection using cables compatible with Qwiic and STEMMA QT systems. The sensor interface, however, provides an analog signal and does not use the I²C bus.
Features
- single-channel infrared reflectance sensor
- sensor type: QTR
- light source: IR LED (940 nm)
- reflection detection using a phototransistor
- supply voltage: 2.9 V – 5.5 V
- output: analog voltage 0 V – VCC
- maximum IR LED current: 30 mA
- maximum board current consumption: 32 mA
- IR emitter brightness control with 32 dimming levels
- optimal sensing distance: 5 mm
- maximum recommended sensing distance: 30 mm
- connector: 4-pin JST SH (side-entry)
- dimensions: 8.1 × 15.2 × 5.5 mm
- weight: 0.4 g
Kit includes
- 1 × Pololu QTR-MD-01A-S reflectance sensor (Pololu 4240)
1203987
Data sheet
- Type of sensor
- Infrared
- Output type
- analog
- Number of sensors
- 1
- Power supply voltage
- 2,9 - 5,5 V
- Schematic diagram of a single QTR sensor channel – analog version (A) - jpg (15,62 kB)
- Pololu QTR Reflectance Sensor Application Note (854,19 kB)
- Schematic diagrams of the QTR/QTRX/QTRXL Reflectance Sensor Arrays (281,71 kB)
- Dimension diagrams of the QTR/QTRX Reflectance Sensor Arrays (1,81 MB)
- 3D models (STEP) of the QTR/QTRX Reflectance Sensor Arrays (48,91 MB)
- Arduino library for the Pololu QTR Reflectance Sensors
Manufacturer BTC Korporacja sp. z o. o. Lwowska 5 05-120 Legionowo Poland sprzedaz@kamami.pl 22 767 36 20
Responsible person BTC Korporacja sp. z o. o. Lwowska 5 05-120 Legionowo Poland sprzedaz@kamami.pl 22 767 36 20
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