SmartElex RLS-06 Analog & Digital 6 IR Line Sensor Array with Potentiometer

What this sensor is

The SmartElex RLS-06 Analog & Digital 6 IR Line Sensor Array is a multi-sensor module used mainly for:

• Line follower robots

• Surface detection

• Path tracking

It contains 6 IR sensors in a row, giving wide coverage instead of a single point

Core Concept (VERY IMPORTANT)

Each sensor detects black vs white surface using IR reflection:

• White surface reflects IR HIGH signal

• Black line absorbs IR LOW signal

With 6 sensors:

• You get position of line, not just detection

Key Specifications

• Number of Sensors::

  • 6 Analog

  • 6 Digital

   

• Operating Voltage: 4.5V 5V

• Current Consumption: ~100 mA

• Optimal Distance: ~3 mm

• Max Distance: ~6 mm

Working Principle

Each sensor has:

• IR LED (emitter)

• Phototransistor (receiver)

It forms a voltage divider:

• More reflection lower voltage

• Less reflection higher voltage

Microcontroller reads this to detect line position

Pinout (Typical)

• VCC 5V

• GND Ground

• A0A5 Analog outputs (6 sensors)

• D0 >

• Digital simple logic

• Analog precise line position

Why 6 sensors are powerful

Compared to single IR sensor:

Enables:

• Smooth turns

• PID control

• High-speed robots

Key Features

• 6 independent sensors (high resolution)

• Analog + digital outputs (flexible use)

• Potentiometer for sensitivity tuning

• Works with Arduino directly

• Low-coe is critical

  Must be:

  • ~24 mm from surface

  Too far wrong readings

  2. Calibration required

  • Adjust potentiometer

  • Tune for:

    • Lighting conditions

    • Surface color

  3. Lighting interference

  • Strong sunlight can affect readings

  4. Power consumption

  • Uses ~100mA (higher than single IR sensor)

  Applications

  • Line follower robot (main use)

  • Maze-solving robot

  • Racing robots

  • Conveyor tracking

  • Grid navigation systems

  RLS-06 vs Other Sensors

  RLS-06

  When to use this

  Use RLS-06 if you want:

  • Fast line follower robot

  • Accurate path tracking

  • PID control projects

  When NOT to use

  Avoid if:

  • Simple obstacle detection use IR obstacle sensor

  • Distance measurement use ultrasonic

  Final Understanding

  This sensor = robot eyes for line tracking