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

Good to know

• 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.