Update: 14th May, 2013 wiringPi version 2 has been released and now has its own website ( to look after it. Most of the documentation on the projects site has been copied over to it the new site, but there may still be 1 or 2 pages that are still missing. I’d encourage you to use the new site if possible where there will be a forum and wiki. The following tables give the mapping of the Raspberry Pi GPIO Pins to the GPIO connector in relation to the pin numbers and the physical location on the connector. This is a representation of the GPIO connector as viewed looking at the board from above, with the USB power at the top and the GPIO to the top-right of the board. If using the connector pin numbering, then note that Pin 1 on the connector is the 3.3v supply. P1: The Main GPIO connector: Board Revisions: Please note the differences between board revisions 1 and 2 (R1 and R2 above) P5: The auxilliary GPIO connector present on Rev. 2 boards only: Each side has three columns.