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RGB-621-R1 RGBCCT Module

https://www.home-master.eu/web/image/product.template/57/image_1920?unique=be96e6e
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The RGB-621-R1 is a smart RS‑485 expansion module designed for seamless integration with MicroPLC and MiniPLC platforms using the Modbus RTU protocol. Powered by the RP2350A microcontroller, it provides precise control of RGB and tunable white (CCT) LED strips for dynamic lighting effects in home and building automation systems. When connected to a MicroPLC or MiniPLC running ESPHome, it becomes fully integrable into Home Assistant, enabling smart lighting scenes, automations, and responsive color control.  

The module provides five independent PWM outputs for full-spectrum RGBCCT LED control, supporting smooth dimming transitions and customizable color/white temperature tuning. It is compatible with both 12 V and 24 V LED strips, making it ideal for modern residential and commercial lighting systems.

In addition to LED control, the RGB-621-R1 includes two isolated digital inputs, allowing connection to wall switches,  sensors, or push buttons for manual or sensor-based activation. A relay output  is available for auxiliary load control, such as switching power to LED drivers or accent lighting.

The front panel includes two tactile buttons and status LEDs for manual operation and system diagnostics. A USB Type-C port is available for firmware updates and configuration.

The RGB-621-R1  comes pre-installed with firmware written in the Arduino IDE and predefined Modbus addresses, enabling seamless out-of-the-box integration with MicroPLC and MiniPLC systems. The complete Modbus address table and default configuration settings can be found in the user manual for straightforward setup. The full source code is available on our GitHub repository.

Developers can program the RGB-621-R1 using MicroPython, Arduino, (C/C++), offering flexibility for both standardized and custom applications.

Seamless integration with ESPHome-based MicroPLC or MiniPLC systems allows for full control and automation of lighting scenes within Home Assistant, supporting a wide range of smart home use cases.

Schematics:

RGB-621-R1-MCUBoard.pdf

RGB-621-R1-FieldBoard.pdf

Links:

GitHub


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    Display Name: RGB-621-R1 RGBCCT Module

    Use Cases:

    • Smart RGB and tunable white LED strip lighting

    • Local + automated lighting control with PLC

    • Wall-switch-integrated lighting automation

    • Scene-based lighting with override capabilities  

    • Smart home and building automation projects 

    Key Features:

    • 5x PWM outputs for RGBCCT LED control

    • 1x Relay output for additional load control

    • 2x Digital inputs for wall switches or sensors
      .
    • 2x Onboard control buttons for manual LED control  
      .
    • LED status indicators on front panel  
      .
    • RS485 Modbus RTU communication (slave device)  
      .
    • RP2350A microcontroller  
      .
    • DIN rail or panel mountable  
      .
    • Open-source firmware; Arduino IDE support  
      .
    • 12–24VDC operation for flexible LED strip compatibility   
      .

    Capabilities:


    • Microcontroller
      RP2350 
    • Communication
      RS485, Modbus RTU (Slave)
    • PWM Channels
      5 (Red, Green, Blue, Cold White, Warm White)
    • Mounting 
      DIN rail or flat-surface  
    • Programming  
      can be programmed using various methods, including MicroPython, C/C++ with the Arduino IDE via USB
    • Open Source  
      Firmware and schematics available on GitHub  


    • Relay Output:
      1x dry contact relay, suitable for lighting loads
    • Digital Inputs
      2x isolated 24VDC inputs for switches
    • Manual Control
      2x onboard push buttons .
    • Indicators  
      LED status lights for channels and communication .
    • LED Input Voltage

        12–24V DC