Arduino Magix -

What if you need 64 LEDs but only have 14 pins? Use a 74HC595 Shift Register. This chip uses serial data (3 pins) to control 8 outputs. By "shifting" bits (like sliding beads on an abacus), you can chain infinite outputs. This is the magix of turning serial into parallel; a trick of information density.

: If using boards like the Arduino Due , remember they run at 3.3V . Applying 5V to their pins will damage the board. arduino magix