Hardware Reference
In-Depth Information
It might not seem like much, but trust us, when you are wiring up multiple devices to
the Raspberry Pi GPIO pins, being able to easily use a breadboard (and see the GPIO
labels at a glance) will make you happy that you completed this hack.
GPIO Quick Reference
If you turn your Pi so that the GPIO pins are in the upper right, the pins are numbered
from top to bottom, with odd numbers on the left and even on the right (thus, the first
row is 1 and 2, second row is 3 and 4, etc.). Note that these do not correspond to GPIO
numbers; for example, GPIO 22 is on pin 15. Table 1-7 explains the purposes of the pins
of a Version 2 board.
Table 1-7. GPIO pin purposes for Version 2 board
PIN NUMBER
PURPOSE
1
3.3 V power
2
5 V power
3
GPIO 2 (SDA)
4
5 V power
5
GPIO 3 (SCL)
6
Ground
7
GPIO 4 (GPCLK0)
8
GPIO 14 (TXD)
9
Ground
10
GPIO 15 (RXD)
11
GPIO 17
12
GPIO 18 (PCM_CLK)
13
GPIO 27
14
Ground
15
GPIO 22
16
GPIO 23
17
3.3 V power
18
GPIO 24
19
GPIO 10 (MOSI)
20
Ground
21
GPIO 9 (MISO)
22
GPIO 25
 
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