SmartElex RLS05 Line Follower Sensor Module

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SKU: 74474


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Brand: SmartElex
Category: Line Tracing Sensors
Tags: Line Sensor, Small robot, line follower, line tracing robot, array, IR, SmartElex, Photodiode, Photoresistor, IR Emitter, IR Sensor, Line following Robot, TCRT5000

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SmartElex RLS05 is Line follower sensor module used to detect the Line. SmartElex RLS05 consists of 5 arrays TCRT5000 IR transmitter and IR receiver pairs.

Line Follower Robot is a machine which follows a line, eithera black line or white line. Basically, there are two types of line follower robots: one is black line follower which follows the black line and second is white line follower which follows the white line.

The paramount of this Line Follower Robot is the IR Sensor and Detector(Photoresistor/Photodiode) which actually senses the line and run over it.

The concept of working of line follower sensor is related to light. We use here the behavior of light at the black and white surface. When light fall on a white surface it is almost fully reflected and in case of black surface light is completely absorbed. This behavior of light is used in building a line follower sensor.

SmartElex RLS05 have 5 analog and digital outputs to the user indicating the presence of the line. The user can use both analog and/or digital signal. Each Sensor has its own LED as an indication of line detection. Each sensor on SmartElex RLS05 is independent of each other.

SmartElex RLS05 has a manual calibration button. The calibration button is multifunctional. SmartElex RLS05 also have SPI and Serial communication Pins. By this communication protocol, we can get the data of IR output values.

Pin Diagram

Top View


RLS05 need to be calibrated to save the black and white value of the surface that it will do the line follow. SmartElex RLS05 save values in EEPROM. Hence, only one-time calibration is needed for the same surface and line.

Step 1:Entering into Calibration Mode
To calibrate RSLS05, simply press the calibration button once or pulling down the Cal. for few milliseconds. Three LEDs (D0-D2-D4) turns ON means it entered in calibration mode.

Step 2:White surface reading
Here you have to place the RLS05 Module on a white surface to read the values. By pressing the calibration button one more time, two led turn ON (D3-D4) means it read and saved the white surface data in EEPROM.

Step 3:Black surface Reading
Now it ready to read black surface value, so you have place module on a black surface. Press the calibration button one more time three led turns ON (D2-D3-D4) to indicate that it read and saved the black surface value.

Step 4:Selection of White or Blackline Tracing
Now you have to decide whether SmartElex RLS05 follows the black line follower or white line follower. To enter into the white line follower you need to press calibration three times within the second. When you pressed here calibration thrice within second three led blinks (D2-D3-D4) for few times to indicate that module ready for the white line follower. For black line follower, you need to press the calibration button two times which will enter into the black line follower. It indicated by three led blinks (D0-D1-D2) for few times.Connection diagrame


  1. Fast response time
  2. High sensitivity
  3. 5 Analog and 5 Digital Output signals with Respective LED.
  4. Each IR has indicating LED (D0-D4).
  5. Available 5V and Ground pin.
  6. Available SPI and Serial communication Pins.

Package Includes:

1 xSmartElex RLS05 Line Follower Sensor Module

1 x 8-Pin Relimate Connectors

Operating Voltage (VDC)

9 ~ 12

Maximum Operating Current


Optimal Sensing Distance


Manual Caliberation


PCB Size ( L x W ) mm

77 x 39

Shipping Weight 0.08 kg
Shipping Dimensions 10 × 5 × 5 cm
1 Year Warranty

This item is covered with a supplier warranty of 1 year from the time of delivery against manufacturing defects only. This is a quality product from the original manufacturer. Only manufacturing defects are covered under this warranty. Reimbursement or replacement will be done against manufacturing defects.

What voids the warranty:

If the product is subject to misuse, tampering, static discharge, accident, water or fire damage, use of chemicals & soldered or altered in any way.

Based on 1 review

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  1. ambika mulge

    Best quality product

    ambika mulge

User Manual

Questions and answers of the customers

    do you have source code to implement PID using thi... Read more
  1. 0 votes
    Q do you have source code to implement PID using this sensor answer now
    Asked by giri.goku on August 17, 2022 12:20 pm

    Hello, if you have any queries related to conne... Read more

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Country Of Origin: India

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