Modifications

== Introduction ==

== Introduction ==

{{ADF-Image|Rasp-Hack-MCP230XX-01.jpg|640px}}

{{ADFImage|Rasp-Hack-MCP230XX-01.jpg|640px}}

While the Raspberry Pi packs and awful lot of punch for the price, and it's fairly flexible where HW expandability is concerned, there are situations where you might want a bit more basic digital IO.  Thankfully, it's an easy problem to solve with an I2C-enabled device like the MCP23008 (for an extra 8 GPIO pins) or the MCP23017 (for an extra 16 GPIO pins).  This tutorial will show you how you can get up and running quickly with either of these chips.

While the Raspberry Pi packs and awful lot of punch for the price, and it's fairly flexible where HW expandability is concerned, there are situations where you might want a bit more basic digital IO.  Thankfully, it's an easy problem to solve with an I2C-enabled device like the MCP23008 (for an extra 8 GPIO pins) or the MCP23017 (for an extra 16 GPIO pins).  This tutorial will show you how you can get up and running quickly with either of these chips.