Module with a reflective sensor and comparator

Module with 4 QTR type optocoupler with analog output. The module operates from 2.9 V to 5.5 V, detects objects at a distance of up to 40 mm. The sensor will be used in projects that require detection of changes in the ground, e.g. in linefollower robots. Pololu 4204

QTR-3A Reflectance Sensor Array

Module with 1 QTRX type optocoupler with RC (digital) output. The module operates from 2.9 V to 5.5 V, detects objects at a distance of up to 30 mm. The sensor will be used in projects that require detection of changes in the ground, e.g. in linefollower robots. Pololu 4301

The :MOVE mini MK2 robot kit allows for automatic line tracking, enhancing the interactivity of educational projects. The kit is easy to assemble, requires no soldering, and adjustable sensors allow for precise sensitivity adjustments for the left and right sides of the robot. The module can track both a dark line on a light background and a light line on a dark background, and backward compatibility with the original :MOVE mini makes it easy to use in older projects. Kitronik 5659

Front sensor module of the Zumo 32U4 robot. It is included as part of the Zumo 32U4 robot kit and built into the assembled versions of the Zumo 32U4 robot. The set includes additional infrared connectors and LEDs. Pololu 3122

Reflection sensor module with 1 QTRXL-HD optocoupler with analogue output. The module is powered by 2.9 ... 5.5V voltage, detects objects at a distance of up to 80mm. Pololu 4641

QTR-1RC Reflectance Sensor (2-Pack)

Module with 13 QTR type optocoupler with analog output. The module operates from 2.9 V to 5.5 V, detects objects at a distance of up to 40 mm. The sensor will be used in projects that require detection of changes in the ground, e.g. in linefollower robots. Pololu 4253

This module can be applied to intellectual robot, obstacle avoidance car, counter device in the pipeline, black and white lines tracking device. This infrared sensor contains two parts: an infrared transmitter and an infrared receiver. 

Module with 4 QTRX type optocoupler with RC (digital) output. The module operates from 2.9 V to 5.5 V, detects objects at a distance of up to 40 mm. The sensor will be used in projects that require detection of changes in the ground, e.g. in linefollower robots. Pololu 4344

Module with 25 QTRX type optocoupler with RC (digital) output. The module operates from 2.9 V to 5.5 V, detects objects at a distance of up to 50 mm. The sensor will be used in projects that require detection of changes in the ground, e.g. in linefollower robots. Pololu 4325

Module with 1 optocoupler type QTRXL with RC (digital) output. It is supplied with the voltage from 2.9 to 5.5 V, detects objects at a distance of up to 80 mm. Pololu 4501

Module with five reflection sensors. It has digital and analogue outputs. Thanks to the embedded EEPROM memory, it enables easy sensor calibration. Cytron Maker Line

Module with 4 QTR type optocoupler with RC (digital) output. The module operates from 2.9 V to 5.5 V, detects objects at a distance of up to 40 mm. The sensor will be used in projects that require detection of changes in the ground, e.g. in linefollower robots. Pololu 4144

Module with 7 QTRX type optocoupler with RC (digital) output. The module operates from 2.9 V to 5.5 V, detects objects at a distance of up to 40 mm. The sensor will be used in projects that require detection of changes in the ground, e.g. in linefollower robots. Pololu 4307

Module with 8 QTR type optocoupler with RC (digital) output. The module operates from 2.9 V to 5.5 V, detects objects at a distance of up to 40 mm. The sensor will be used in projects that require detection of changes in the ground, e.g. in linefollower robots. Pololu 4148