Connect to the SPI pins, SCK & MOSI, with a chip select that latches all 3 at once. SCK parallel to all 3, MOSI daisy chained, CS in parallel to all 3This will write them really fast, compared to shiftout:digitalWrite(CS, LOW);SPI.transfer(byte1);SPI.transfer(byte2):SPI.transfer(byte3);digitalWrite (CS, HIGH);
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