The MCP23017 is ideal for Raspberry Pi, Arduino and more projects as it can add 16 Input or Output pins to your project at the cost of only 2! Best of all you can use multiple chips on the I2C Bus.
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With a little extra circuitry, breadboard and jumper wires you can get going with this in no time. and add ports to your Raspberry Pi.
We've found the tutorial at Raspberry Pi Spy the best to use.
Unlike some sellers all of the IC's we sell are genuine and made by the manufacture shown in the picture. Details of the chip can be found in the datasheet downloadable below.