EZ-Expander Shield description:
The EZ-Expander is an Arduino shield that makes it easy and inexpensive to add digital output pins to your Arduino. This is accomplished by utilizing two 74HC595 shift registers. There are 16 new output pins on the shield (numbered 20-35), and the shield itself uses 3 existing Arduino pins to operate (pins D8, D12, and D13) so overall you get 13 additional output pins to use.
The new digital pins 20-35 can only be used for output, not input. They cannot source or sink as much current as normal Arduino pins. An Arduino pin can source/sink 40mA, but the outputs the EZ-Expander shield can only source/sink 6mA.
All other Arduino pins are brought up to the top of the shield for easy access. Since pins 8 (latch), 12 (clock), and 13 (data) are used by the shield, they are not available for use and are marked with an ‘X’ on the silkscreen.
EZ-Expander Shield specification:
- pin 8: latch
- pin 12: clock
- pin 13: data
EZ-Expander Shield pinout:
For more detail: EZ-Expander Shield
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