HD-4X-4-HC (4 Inputs & 4 High Current Outputs)

for all BrightSigns with GPIO

HD-4X4-HC   ,4 Input & 4 High Current Drivers I/O Board

Features:

• small footprint (3.2 x 3.0 inches)
• Can mount directly to the DB15 connector or use a DB15 extension cable
• 4 Direct inputs.
• 4 High Current Outputs (6 amps maximum each output and 30 volts maximum.
• This design prevents output activation on power-up.
• Requires external 12 or 24 Volt power supply

Inputs:

There is a terminal block for inputs (normally open switches).  These 4 inputs are labeled 0-3 and correspond to BTN0-BTN3 BrightSign inputs.

Outputs:

There are high current drivers to drive lamps or LED panels.  The external 12Volts and 0Volts is provided on the terminal blocks so that voltage can be supplied to external devices from the terminal block.

Outputs: Connect Loads between 'Output' and +V.
.

Note on the BrightSign GPIO:

When the BrightSign powers up is has pull-up resistors to the inputs (GPIO 0-7) which makes the signals high.  As the BrightSign loads the software (which can take some time) this leaves the GPIO all high which would turn on the outputs.  This design prevents this from happening.  In the program, set the GPIO 4-7 to high and set to output.  Then when you want an output to turn on, set that GPIO low and the inverter chip inverts the signal to a high in order to turn on the high current mosfet.

Note: Select a power supply with enough amps to handle your loads plus 20 milliamps for the board.

Link: Schematic  (See the schematic for typical load connections).

Updated: 03/02/2024