SmartElex RLS05 Line Follower Sensor

Overview

The SmartElex RLS05 Line Follower Sensor is a multi-channel infrared (IR) line detection module designed for accurate line tracking in robotics systems.

• Uses IR transmitter'receiver pairs

• Detects contrast between black and white surfaces

• Provides both analog and digital outputs

• Designed for line follower robots and automation systems

Commonly used in robot navigation and path tracking

Working Principle

• Based on reflection of infrared light:

  • White surface reflects IR light

  • Black surface absorbs IR light

   

• Each sensor pair:

  • Emits IR light

  • Measures reflected signal

   

Difference in reflection determines line prese5 IR sensor channels (array type)

Each channel:

• Independent detection

• Has its own indicator LED

Enables detection of:

• Line position

• Edges and curves

Output Characteristics

Dual Output Type

• Analog Output (5 channels)

  • Provides intensity of reflected light

   

• Digital Output (5 channels)

  • HIGH/LOW depending on threshold

   

Flexible for:

• Simple logic control

• Advanced PID control systems

Electrical Characteristics

• Operating Voltage: 9V 12V

• Operating Current: ~130 mA

Detection Characteristics

• Optimal sensing distance: ~3 mm from surface

• Fast response time

• High sentracking requires correct height placement

  Calibration System

  • Manual calibration button

  • Stores calibration values in EEPROM

  Calibration Process:

  • White surface reading

  • Black surface reading

  • Select tracking mode (black/white line)

  One-time calibration is sufficient for same surface

  Communication & Interface

  • Standard outputs:

    • Analog pins

    • Digital pins

  • Additional interfaces:

    • SPI / Serial communication (advanced use)

  Internal Architecture

  • 5 IR LED emitters

  • 5 photodiode/phototransistor receivers

  • Signal conditioning circuit

  • Comparator (for digital output)

  • EEPROM (for calibration storage)

  Functional Behavior

  • Continuously scans surface below

• Output:

  • Multi-channel data used for steering correction

Key Technical Features

• 5-channel IR sensor array

• Analog + digital outputs

• EEPROM-based calibration

• Manual calibration button

• Independent sensor channels

• SPI/Serial output support

• High sensitivity and fast response

Advantages

• Accurate line detection and tracking

• Supports both black-line and white-line modes

• Flexible output (analog + digital)

• Easy calibration and setup

• Suitable for advanced control algorithms

Limitations

• Requires proper calibration for accuracy

• Performance affected by:

  • Ambient light

  • Surface reflectivity

• Needs precise mounting height (~3 mm)

• Higher power consumption compared to simple Ilications

  • Line follower robots

  • Autonomous navigation systems

  • Robotics competitions

  • Industrial path tracking

  • Educational robotics systems

  Technical Summary

  The RLS05 is a multi-channel IR line tracking sensor array that:

  • Uses optical reflection principles for detection

  • Provides rich multi-sensor data (analog + digital)

  • Enables precise path tracking and control

  Best suited for:

  • Advanced line follower robots

  • Systems requiring high accuracy and stability in navigation