Traffic Light Module – 3-Color LED Signal Light for Arduino

The Traffic Light Module is a compact LED display board featuring red, yellow, and green LEDs arranged in the classic vertical traffic signal pattern. Designed with a common cathode interface and built-in current limiting resistors, it allows each LED to be controlled independently through digital signal output, making it ideal for traffic light simulations, educational projects, and embedded systems training.

Key Features

• Three high-visibility LEDs: Red, Yellow, and Green
• Classic vertical traffic light arrangement
• Common cathode interface with independent LED control
• Built-in current limiting resistors, no external components needed
• Compatible with 3.3V and 5V logic levels
• Simple 4-pin interface for easy wiring
• Supports PWM control for fade and dimming effects
• Compact PCB design suitable for breadboard or panel mounting
• Digital signal output compatible with microcontrollers
• Easy integration with Arduino, 8051, and other microcontroller platforms

Technical Specifications

Applications

• Traffic Light Simulation Projects
• Smart City and IoT Model Demonstrations
• Educational Electronics and Microcontroller Training
• Embedded Systems Prototyping
• Model Traffic Control Systems
• Arduino and Robotics Learning Kits
• PWM and Digital Output Demonstration Projects

Important Notes

• Connect the GND pin to the microcontroller ground before powering the module.
• Each LED pin (R, Y, G) is active HIGH; apply a HIGH digital signal to turn on the respective LED.
• Use PWM-capable pins if fade-in or fade-out lighting effects are required.
• Do not exceed the rated operating voltage of 5V to avoid damaging the onboard LEDs.
• Ensure correct pin mapping (R, Y, G, GND) as labeled on the module before wiring to a microcontroller.
• Current limiting resistors are built-in, so no external resistors are required for standard operation.