Long Range Li-Fi Data Transfer Module – Visible Light Communication

Product Description

The Long Range Li-Fi Data Transfer Module is a wireless Visible Light Communication (VLC) system designed to transmit serial data using LED light instead of conventional radio-frequency communication. It provides a point-to-point optical communication link suitable for applications where RF-based communication may be undesirable or where line-of-sight optical data transmission is preferred.

The system consists of a Li-Fi transmitter module and a Li-Fi receiver module. The transmitter modulates data onto visible light, while the receiver detects the optical signal and converts it back into serial data for the connected controller or electronic system.

The module is designed for a communication range of approximately 8 to 10 feet under suitable clear-path conditions. The receiver includes an adjustable trim potentiometer, allowing users to tune the receiver sensitivity according to ambient lighting and installation conditions.

Operating at a 9600 bps baud rate, the module is suitable for reliable point-to-point serial data communication between compatible devices. Since the communication is based on visible light, the signal is generally confined to the illuminated line-of-sight path rather than propagating through walls like typical RF signals.

Features

• Visible Light Communication (VLC) technology
• Wireless data transmission using LED light
• Point-to-point optical communication
• Communication range of approximately 8–10 feet under suitable conditions
• 9600 bps communication speed
• Adjustable receiver sensitivity
• Onboard trim potentiometer for receiver calibration
• Reduced dependence on RF communication
• Useful in RF-sensitive environments
• Compact transmitter and receiver modules
• Suitable for serial data transfer
• Line-of-sight communication
• Useful for indoor and specialized communication applications

Specifications

Working Principle

The Li-Fi transmitter receives serial data from a connected electronic system and modulates the intensity of an LED at a high frequency. The rapid light modulation is used to encode the data without producing noticeable changes in the visible illumination.

The receiver detects these rapid changes in light intensity and converts them back into electrical serial data. The restored data can then be read by a microcontroller, computer, or other compatible electronic system.

Because the communication depends on the optical path between the transmitter and receiver, proper alignment is important for reliable operation.

Optical Communication

Unlike conventional Wi-Fi or Bluetooth systems that use radio waves, this module uses visible light as the transmission medium.

The optical nature of the system provides several advantages:

• Communication is directional
• The signal is primarily limited to the illuminated area
• It does not rely on conventional RF transmission
• It can be useful in environments sensitive to radio-frequency interference
• It can provide localized communication within a defined optical path

Actual performance depends on lighting conditions, transmitter power, receiver sensitivity, distance, alignment, and environmental factors.

Receiver Sensitivity Adjustment

The receiver includes an onboard trim potentiometer that can be used to adjust sensitivity.

This adjustment can help compensate for:

• Ambient lighting
• Distance between modules
• Indoor illumination
• Background light
• Receiver alignment

To achieve stable communication, slowly adjust the trim potentiometer while observing the received serial data until the output becomes reliable.

Typical Application Scenarios

Medical and Healthcare

Suitable for research and specialized communication applications where RF communication may need to be minimized. Actual use in medical environments should be evaluated according to applicable equipment and safety requirements.

Aviation and RF-Sensitive Environments

Visible-light communication can be explored for localized data transfer in environments where RF usage is restricted or undesirable.

Hazardous Environments

Optical communication can be useful for specific applications where RF communication is undesirable. Suitability for hazardous locations depends on the complete system design and applicable safety certifications.

Indoor Navigation and Robotics

The transmitter can be installed with a light source or positioning point to provide localized optical data to robots or handheld devices equipped with the receiver.

Underwater Communication

Visible light can be considered for short-range underwater data communication because radio waves do not propagate well through water. Actual range depends strongly on water clarity, optical power, alignment, and the environment.

Applications

• Li-Fi communication projects
• Visible light communication
• Wireless serial communication
• RF-free communication experiments
• Robotics communication
• Indoor navigation
• Optical data transfer
• Educational VLC projects
• Embedded wireless communication
• Industrial communication prototypes
• Underwater communication experiments
• Smart lighting communication research
• Point-to-point optical links
• IoT communication prototypes
• Laboratory communication systems

Connection Example

The transmitter can be connected to a suitable serial-data source such as a microcontroller or development board. The receiver can then be connected to another compatible serial interface to recover the transmitted data.

Package Includes

• 1 × Li-Fi Transmitter Module
• 1 × Li-Fi Receiver Module with Adjustable Trim Pot

Product Disclaimer

Product images are shown for illustrative and representational purposes only. The actual transmitter and receiver modules may vary slightly in PCB colour, component placement, connector arrangement, dimensions, LED appearance, or other visual details depending on the manufacturing batch.

Communication range and reliability are affected by ambient lighting, sunlight, distance, optical alignment, obstructions, receiver sensitivity, and installation conditions. The stated 8–10 foot range should be considered an approximate optimal range rather than a guaranteed operating distance in all environments.

The module is intended for development, experimentation, prototyping, and suitable communication applications. Specialized environments such as medical, aviation, hazardous, or underwater applications require independent system-level validation and appropriate certification where applicable.

Important Notes

Line-of-Sight Requirement

For best performance, keep a clear optical path between the transmitter LED and receiver sensor. Objects blocking or partially obstructing the light path can reduce communication reliability.

Receiver Calibration

Use a small screwdriver to adjust the receiver’s trim potentiometer slowly until the serial output becomes stable.

Ambient Light

Strong sunlight and other intense light sources can affect the receiver. For best performance, reduce direct exposure to bright ambient light.

Maximum Range

For approximately 10-foot communication, align the transmitter and receiver directly with each other and minimize obstructions and excessive ambient light.

Baud Rate

The module is optimized for 9600 bps serial communication. Use compatible serial settings on both the transmitting and receiving systems.