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This is the GPIO Pin layout for the Pi 3, Pi 2, Pi Zero, Model B+ and Model A+ boards.
You can view the layout for the Model A and Model B Revision 2.0 Boards here.
You can view the layout for the original Model B Revision 1.0 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
2
I2C1_SDA
3
4
5V0
-
-
9
3
I2C1_SCL
5
6
GND
-
-
7
4
GPIO_4
7
8
UART1_TXD
14
15
-
-
GND
9
10
UART1_RXD
15
16
0
17
GPIO_17
11
12
GPIO_18
18
1
2
27
GPIO_27
13
14
GND
-
-
3
22
GPIO_22
15
16
GPIO_23
23
4
-
-
3V3
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
-
-
GND
25
26
SPI0_CE1_N
7
11
30
0
ID_SD
27
28
ID_SC
1
31
21
5
GPIO_5
29
30
GND
-
-
22
6
GPIO_6
31
32
GPIO_12
12
26
23
13
GPIO_13
33
34
GND
-
-
24
19
GPIO_19
35
36
GPIO_16
16
27
25
26
GPIO_26
37
38
GPIO_20
20
28
-
-
GND
39
40
GPIO_21
21
29