32 Port IO Expander

Lots of IO

Low on IO ports on your Arduino or chipKIT board? Then this board is for you! Sporting a massive 32 IO ports using just the 4 pins of your SPI interface.

Flexible IO

Each individual pin can be set to an input or an output. Not only that, the inputs can have internal pullups and Change Notification interrupts enabled - just like the real IO pins in your Arduino.

Even More IO

32 IO ports still not enough? Up to 4 of these boards can be stacked together, all sharing the same SPI pins, giving you a massive 128 IO ports. Add one more chip-select pin on your Arduino and you can double that again to 256. And so on.

Input Voltage 2.7V - 5.5V
IO Ports32