LED traffic lights light module

FEATURES — 3×10 mm Traffic Light Module for Arduino & Educational Robotics

Technical Parameters

• Module size: 56 × 21 × 11 mm (approx.)
• LED colors: red, yellow and green
• LED diameter: 10 mm (×3)
• Brightness: standard indoor brightness
• Operating voltage: 5 V DC
• Signal type: digital output control
• Interface: common cathode, independent control for red, yellow and green LEDs

This traffic light module with 3×10 mm LEDs is ideal for learning Arduino programming, practicing sequential logic, and simulating real traffic lights in STEM, educational robotics and basic electronics.

It includes three large, high-visibility LEDs in red, yellow and green, mounted on a compact PCB with direct-connection pins. Simply connect it to your development board and control each LED through a digital output.

Module Pinout

The module includes 4 pins for easy connection to a breadboard or your Arduino board using Dupont jumper wires:

• GND: Ground / common cathode
• R: Activates the red LED
• Y: Activates the yellow LED
• G: Activates the green LED

The module runs on 5 V, making it compatible with most Arduino boards and other 5 V microcontrollers.

Applications

• Real traffic light simulation in Arduino projects.
• Educational robotics activities in schools, academies and STEAM workshops.
• Timing, state-machine and sequential logic programming exercises.
• Visual indicators for electronic projects (start/stop, OK/error…).

Advantages of the Traffic Light Module

• All components integrated into one board — easy to use and highly visual.
• Perfect for beginners learning Arduino and electronics.
• 10 mm LEDs provide excellent visibility during classes and demos.
• Ideal for teaching, demonstrations and fast prototyping.

FAQs

Is it compatible with Arduino?
Yes. It works with any 5 V Arduino board (UNO, Nano, Mega, etc.). Simply connect R, Y and G to digital pins and GND to ground.

Does it need external resistors?
Depending on your board and project, you may want to add resistors to limit LED current. In low-power educational projects, it can often be connected directly to Arduino pins as long as you respect the board’s current limits.

Is it suitable for classroom use?
Absolutely. This module is very visual and durable, ideal for teaching how traffic lights work, timing sequences and basic programming to students.