HD-K524 relay control for LED displays
The Huidu HD-K524 provides six power-switch control channels for a full-color LED display system. Its timing function supports scheduled control, while a single photosensitive probe input enables automatic brightness adjustment. The board includes a connection port for a sending card or player box.
Specifications and connections
| Parameter | Specification |
|---|---|
| Power-switch control | 6 channels, labeled K1–K6 |
| Timing function | Supported |
| Photosensitive probe input | 1 channel; automatic brightness adjustment |
| Power supply port | 5 V; terminals labeled GND and +5V |
| Rated voltage | Minimum 4.2 V; typical 5.0 V; maximum 5.5 V |
| Control connection | Sending card / player box connection port |
| Working temperature | −40 to 80 °C; typical 25 °C |
| Storage temperature | −40 to 105 °C; typical 25 °C |
Timing and brightness control
Use the timing function for scheduled operation of the display’s power-switch controls. The separate photosensitive probe input supports brightness adjustment according to light conditions. The specification identifies the power supply, probe, sending-card/player-box and power-switch control connections in its board diagram.
For time retention during normal operation, the manufacturer instructs users to ensure that the control-card battery is not loose. Refer to the connection diagram in the PDF before wiring the board.

Download specification
Download the HD-K524 specification (PDF)
Frequently Asked Questions
How many power-switch channels does the HD-K524 have?
The HD-K524 supports six power-switch control channels, labeled K1 through K6 on the board.
Can the K524 adjust LED display brightness automatically?
Yes. It supports one photosensitive probe input for automatic brightness adjustment.
What supply voltage does the HD-K524 use?
The board has a 5 V supply port. The specification lists a rated voltage of 4.2 V minimum, 5.0 V typical and 5.5 V maximum.
Does the HD-K524 support timed control?
Yes. Timing is a listed function. The manufacturer also notes that the control-card battery should be secure for time retention during normal operation.
Where does the K524 connect in the control system?
The specification identifies a sending card / player box connection port, separate from the photosensitive probe, power supply and six power-switch control ports. Consult the PDF board diagram for the connection locations.




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