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LED Tube + T-790 Controller Setup Guide

This document summarizes the final working setup for controlling a 24V addressable LED tube using a T-790 LED controller, a Mean Well LRS-350-24 power supply, and a Raspberry Pi.

This version includes the final direct Ethernet configuration between Raspberry Pi and Controller.

Hardware Used

  • LED Tube: 24V addressable RGB LED tube (DATA + CLK type)
  • Controller: T-790 / T-790K LED Controller (AC 100–240V input)
  • Power Supply: Mean Well LRS-350-24 (24V DC output)
  • Controller Output Mode: OUT-TTL
  • Control Device: Raspberry Pi (Direct Ethernet connection)

Power Connections

Controller Power

The controller has an internal AC power supply.

Wall Socket (AC 100–240V)
   └── IEC Power Cable
         └── Controller AC IN

⚠️ Do NOT connect the controller to the 24V PSU.

LED Power

The LED tube is powered only by the 24V power supply.

Mean Well LRS-350-24
   +V (24V) ─────────▶ LED +24V
   -V (GND) ─────────▶ LED GND

Signal Connections (Controller → LED)

Use OUT-TTL on the controller (NOT DMX).

OUT-TTL Pinout

Pin 1: GND
Pin 2: DAT
Pin 3: (unused)
Pin 4: CLK

LED (4 wires) Connection

LED GND   ─────────▶ Controller OUT-TTL Pin 1 (GND)
LED DATA  ─────────▶ Controller OUT-TTL Pin 2 (DAT)
LED CLK   ─────────▶ Controller OUT-TTL Pin 4 (CLK)

🔗 Important:
LED GND must be connected to BOTH:

  • Power supply -V
  • Controller GND (shared reference)

Complete Wiring Overview

AC WALL POWER
   ├──▶ Controller (AC input)
   └──▶ Mean Well PSU

Mean Well PSU
   +24V ─────────▶ LED +24V
   -V   ──┬──────▶ LED GND
           └────▶ Controller GND (OUT-TTL)

Controller OUT-TTL
   DAT ─────────▶ LED DATA
   CLK ─────────▶ LED CLK

Booting Controller into Test Mode

Test mode is used to verify wiring and LED compatibility without a PC or Raspberry Pi.

Method Used

  1. Power OFF controller
  2. Hold SET
  3. Power ON while holding
  4. Release after screen changes

If LEDs animate in test mode → hardware setup is correct.

Final Network Configuration (Direct Connection)

The connection is direct from Raspberry Pi to Controller using Ethernet (no router).

Raspberry Pi  ───── Ethernet Cable ─────  Controller

Controller IP Address

192.168.60.69

Raspberry Pi Static IP Configuration

Edited /etc/dhcpcd.conf:

interface eth0
static ip_address=192.168.60.10/24
static routers=192.168.60.1
static domain_name_servers=8.8.8.8

After reboot:

ping 192.168.60.69

Successful replies confirm direct communication.

Controller Configuration Notes

  • Output mode: TTL
  • IC type: must match LED tube chipset
  • Pixel count: number of addressable pixels in the tube
  • Color order: RGB / GRB / BRG (adjust if colors incorrect)
  • Controller must NOT be in test mode for network control

Software Control

After confirming ping works:

  • Use Art-Net / sACN (E1.31) from Raspberry Pi
  • Universe typically set to 1
  • Each pixel = 3 DMX channels (R, G, B)

Key Rules

  • ❌ Do NOT power LEDs from controller
  • ❌ Do NOT feed 24V into controller
  • ❌ Do NOT use DMX output for TTL LEDs
  • ✅ Always share GND between PSU and controller
  • ✅ Raspberry Pi and Controller must be in same subnet

Current Status

✅ Hardware verified
✅ Test mode working
✅ Direct Ethernet connection established
✅ Controller IP identified (192.168.60.2)
➡️ Ready for Raspberry Pi animation control