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This is the GPIO Pin layout for the original Model B Revision 1.0 boards. You can view the layout for the current Model A and Model B Revision 2.0 boards here.
For each Pin on the Raspberry Pi breakout pads, the table provides the following detail:
Wiring
GPIO
Name
Raspberry Pi
Name
GPIO
Wiring
--------
------
----------
----
----
----------
------
--------
-
-
3V3
1
2
5V0
-
-
8
0
I2C0_SDA
3
4
DNC
-
-
9
1
I2C0_SCL
5
6
GND
-
-
7
4
GPIO_4
7
8
UART0_TXD
14
15
-
-
DNC
9
10
UART0_RXD
15
16
0
17
GPIO_17
11
12
GPIO_18
18
1
2
21
GPIO_21
13
14
DNC
-
-
3
22
GPIO_22
15
16
GPIO_23
23
4
-
-
DNC
17
18
GPIO_24
24
5
12
10
SPI0_MOSI
19
20
GND
-
-
13
9
SPI0_MISO
21
22
GPIO_25
25
6
14
11
SPI0_SCLK
23
24
SPI0_CE0_N
8
10
-
-
DNC
25
26
SPI0_CE1_N
7
11