Makershed SMD LED Shield

Using Arduino LEDs and Multiplexing
12

OK, let's try swapping polarity (HIGH for LOW) by changing:

      shiftOut(dataPin, clockPin, MSBFIRST, ~(1<<row));  // One row LOW
     shiftOut(dataPin, clockPin, MSBFIRST, 1<<column);  // One column HIGH

to:

      shiftOut(dataPin, clockPin, MSBFIRST, 1<<row);  // One row LOW
     shiftOut(dataPin, clockPin, MSBFIRST, ~(1<<column));  // One column HIGH