3.3V 2 SDA 3 SCL 4 GND 17 27 22 3.3V 10 MOSI 9 MISO 11 SCKL GND 5V 5V GND 14 TXD 15 RXD 18 GND 23 24 GND 25 8 7 

8 9 7 0 2 3 12 13 14 Rv1:0 - Rv2:2 Rv1:1 - Rv2:3 4 17 GPIO0 Rv1:21 - Rv2:27 GPIO2 GPIO3 22 10 9 11 Name 3.3v SDA SCL GPIO7 0v 3.3v MOSI MISO SCLK 0v Name Header 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 Header Name BCM GPIO WiringPi Pin 5v 5v 0v TxD RxD GPIO1 0v GPIO4 GPIO5 0v 14 15 18 23 24 15 16 1 4 5 GPIO6 CE0 CE1 Name BCM GPIO WiringPi Pin 6 10 11 25 8 7 WiringPi: GPIO Pin Numbering Tables http://wiringpi.com/ P1: The Main GPIO connector WiringPi Pin BCM GPIO WiringPi Pin BCM GPIO Note the differences between Revision 1 and Revision 2 Raspberry Pi’s. The Revision 2 is readily identifiable by the presence of the 2 mounting holes. The revision 2 Raspberry Pi has an additional GPIO connector, P5, which is next to the main P1 GPIO connector: P5: Secondary GPIO connector (Rev. 2 Pi only) WiringPi Pin BCM GPIO Name Header 17 19 28 30 5v GPIO8 GPIO10 0v 1 2 3 4 5 6 7 8 Name 3.3v GPIO9 GPIO11 0v BCM GPIO WiringPi Pin 29 31 18 20 WiringPi Pin BCM GPIO Name Header Name BCM GPIO WiringPi Pin