LED Traffic Light Module Red Green Yellow 3-Color Signal Lamp Board 5V

LED traffic light module, red/green/yellow independent control, 5V power, high-brightness LEDs. Directly connect to MCU IO pins, active low. Ideal for Arduino/STM32 traffic light teaching, signal model, indication, smart car road simulation DIY

LED Traffic Light Module Application features:

◆ LED Colors
Red / Yellow / Green (independent control)

◆ Supply Voltage
DC 5V

◆ Control Method
Individual IO control (active low)

◆ Current Limiting
Onboard resistors (direct MCU connection, no external needed)

◆ Pin Definition

R (Red control)

Y (Yellow control)

G (Green control)

GND

◆ LED Type
High-brightness through-hole / SMD (varies by version)

LED Traffic Light Module Typical Applications

Traffic light teaching experiments

Intersection model

Smart car road simulation

Signal indicator

Traffic light countdown model

Children's electronic blocks

Embedded course projects

LED Traffic Light Module Key Advantages

3-color independent control

Onboard current limiting resistors

Direct MCU connection

Plug-and-play

Perfect for teaching and DIY

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FAQ

1. What is the LED Traffic Light Module (Red/Yellow/Green)?
The LED Traffic Light Module is an electronic learning module that integrates three LEDs in red, yellow, and green. It mimics the appearance of a real traffic signal (red on top, yellow in the middle, green at the bottom) and is commonly used for programming education and project prototyping with platforms like Arduino and Raspberry Pi. The module includes onboard current-limiting resistors, allowing direct connection to a microcontroller's digital I/O pins.

2. What are the key specifications of this module?
Key specifications include:

• Operating Voltage: DC 5V (some modules support 3.3V~5V)

• LEDs: 3 pieces, 5mm or 8mm diameter

• Colors: Red, Yellow, Green

• Interface: Common cathode with independent control for each color

• Operating Current: Red ~13mA, Yellow ~13mA, Green ~25mA

• Dimensions: Typically 56×21×11mm or 61×21×11mm

3. What is the pinout of the module?
The module typically provides 4 pins:

• R (Red) : Red LED control

• Y (Yellow) : Yellow LED control

• G (Green) : Green LED control

• GND: Common ground (common cathode)

Some modules label the common pin as "-" or "Common". Connect R/Y/G to the microcontroller's digital output pins and GND to the microcontroller's GND.

4. What applications is this module suitable for?
This module is widely used for:

• Educational demonstrations: Teaching traffic signal systems, programming basics, and circuit control

• Maker projects: Smart city simulations, warning light systems

• Status indication: Visual process status indicators in industrial or home environments

• STEM education: Electronics and programming classroom demonstrations, robotics competitions

5. How do I connect this module to an Arduino?
Connection is straightforward:

1. Module GND → Arduino GND

2. Module R → Arduino digital pin (e.g., D3)

3. Module Y → Arduino digital pin (e.g., D4)

4. Module G → Arduino digital pin (e.g., D5)

Simply program the pins to output HIGH (turn on) or LOW (turn off) to create traffic light sequences.

6. What are the operating voltage and current of this module?
The module operates at DC 5V, with some modules supporting 3.3V~5V. Typical operating current per LED:

• Red: 13mA

• Yellow: 13mA

• Green: 25mA

Single LED power consumption is approximately 5~20mA, depending on the onboard resistors and supply voltage.

7. Does the module support PWM dimming?
Yes. By connecting the R/Y/G pins to PWM-capable pins on your microcontroller, you can control the brightness of each LED via PWM signals. This enables dynamic lighting effects such as fading in and out.

8. Is the module common cathode or common anode?
The most common version is common cathode, meaning the cathodes (negative terminals) of all three LEDs are connected together as the common pin (GND). LEDs are turned on by applying a HIGH signal to their respective control pins. Some modules may be common anode — check the silk-screen labeling on your module.

9. What should I do if the LEDs don't light up or the logic is reversed?

• No light: Check that power (5V) and GND are correctly connected, and confirm that the control pins are set as OUTPUT and driven HIGH in your code.

• Reversed logic (LED turns on with LOW, off with HIGH): The module is likely common anode. Solutions: ① Invert HIGH/LOW in your code; ② Connect the common pin to VCC instead of GND.

• Individual LED not working: Check the corresponding pin connection or try a different digital pin.

10. What are common alternative models for this module?
Similar products include:

• Keyes KE0118: Traffic light module from Keyes, compatible with Arduino/Raspberry Pi

• Keyes KE2056: Another Keyes traffic light module

• Cytron Traffic Light LED Module: Common cathode, 5mm diffused LEDs

• SunFounder Mini Traffic Light LED Module: 8mm LED module