SM18512PS LED Strip Controller with DMX512 Protocol

Overview

This project provides a C++ implementation for controlling LED strips using the SM18512PS IC via the DMX512 protocol. The LED strip consists of four wires:

• 12-24V Input (Power Supply)
• A & B Wires (RS485 Communication)
• Negative (GND)

The communication is established using a USB to RS485 adapter, and the software ensures proper control of the LED effects through serial communication.

Features

• DMX512 Protocol for LED control
• Supports RGBW color variation
• Predefined effects: Solid, Breathing, Flashing
• Implemented in C++
• Integrated with ROS 2 for use in Autonomous Mobile Robots (AMR) or Automated Guided Vehicles (AGV)

Technical Details

• Baud Rate:
  • 250000 for normal operation
  • 90000 for initialization
• Time Breaks:
  • 100 microseconds for 250000 baud
  • 12 microseconds for data transmission

Note: These values may vary depending on different LED strips and ICs.

LED Control Behavior

Due to the architecture of the SM18512PS IC, individual LED control is not possible. Instead, we control groups of LEDs:

• Each IC controls 6 LEDs.
• We define 1 Group = 6 LEDs.
• This means control is limited to groups of 6 LEDs rather than individual LEDs.

ROS 2 Integration

This project includes a ROS 2 package that allows seamless integration with AMR and AGV systems. The ROS 2 node listens for LED mode commands and publishes the LED status.

Package Usage

1. Clone the Repository:

   git clone https://github.com/Kapilmech2003/led_strip_cpp_code.git
   cd led_strip_cpp_code

2. Build the Package:

   colcon build --packages-select led_strip_cpp_code

3. Run the Node:

   ros2 run led_strip_cpp_code ros_led

Contact

For any issues or help needed, feel free to reach out: 📧 kapilkapi2003@gmail.com