Modifications

Most Raspberry Pi boards follow the newer “Revision 2” pin arrangement:

Most Raspberry Pi boards follow the newer “Revision 2” pin arrangement:

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If you’re using an early Model B board (easy to spot — there’s no mounting holes), a few of the GPIO pin numbers are different:  

If you’re using an early Model B board (easy to spot — there’s no mounting holes), a few of the GPIO pin numbers are different:  

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Notice that GPIO pins 14 and 15 are marked off-limits. These are set up as a serial port by default. There’s a way to disable this, but it’s somewhat annoying and there are plenty of other pins to work with, much simpler.

Notice that GPIO pins 14 and 15 are marked off-limits. These are set up as a serial port by default. There’s a way to disable this, but it’s somewhat annoying and there are plenty of other pins to work with, much simpler.