Here, Serial Peripheral Interface (SPI) is used for communication ... by communicating control signals from a PC using an Arduino Mega 2560 to control the four HV513 (total 32 channel control).
the old fogies of the Arduino world, the Uno and Mega, actually have two chips. An ATMega16u2 takes care of the USB connection, while the standard ‘328 or ‘2560 takes care of all ~duino tasks.
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