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Raspberry Pi GPIO Pin Layout: How to Check It

Raspberry Pi

This post summarizes how to check the Raspberry Pi’s GPIO pins layout.

Introduction

The GPIO pin layout on a Raspberry Pi can be confusing. I always have to look up the pin layout before working with it.

Since I often forget how to check it, I’m leaving this note as a reminder.

Note: This article was translated from my original post.

Environment

The GPIO pin layout is the same (40 pins) on Raspberry Pi 2, 3, and 4. This post assumes those models.

On the other hand, the Raspberry Pi 1 Model B+ and earlier have a different layout (26 pins).

Prior to the Pi 1 Model B+ (2014), boards comprised a shorter 26-pin header.

Ref. Official Documentation

Checking the Raspberry Pi GPIO Pin Layout

There are two main ways to check the GPIO pin layout:

  • Using the pinout command
  • Checking official documentation

Checking with the pinout Command

You can quickly check the pin layout by running the pinout command in the Raspberry Pi terminal:

pi@raspberrypi:~ $ pinout
,--------------------------------.
| oooooooooooooooooooo J8   +======
| 1ooooooooooooooooooo  PoE |   Net
|  Wi                    1o +======
|  Fi  Pi Model 4B  V1.2 oo      |
|        ,----. +---+         +====
| |D|    |SoC | |RAM|         |USB3
| |S|    |    | |   |         +====
| |I|    `----' +---+            |
|                   |C|       +====
|                   |S|       |USB2
| pwr   |hd|   |hd| |I||A|    +====
`-| |---|m0|---|m1|----|V|-------'

Revision           : c03112
SoC                : BCM2711
RAM                : 4GB
Storage            : MicroSD
USB ports          : 4 (of which 2 USB3)
Ethernet ports     : 1 (1000Mbps max. speed)
Wi-fi              : True
Bluetooth          : True
Camera ports (CSI) : 1
Display ports (DSI): 1

J8:
   3V3  (1) (2)  5V
 GPIO2  (3) (4)  5V
 GPIO3  (5) (6)  GND
 GPIO4  (7) (8)  GPIO14
   GND  (9) (10) GPIO15
GPIO17 (11) (12) GPIO18
GPIO27 (13) (14) GND
GPIO22 (15) (16) GPIO23
   3V3 (17) (18) GPIO24
GPIO10 (19) (20) GND
 GPIO9 (21) (22) GPIO25
GPIO11 (23) (24) GPIO8
   GND (25) (26) GPIO7
 GPIO0 (27) (28) GPIO1
 GPIO5 (29) (30) GND
 GPIO6 (31) (32) GPIO12
GPIO13 (33) (34) GND
GPIO19 (35) (36) GPIO16
GPIO26 (37) (38) GPIO20
   GND (39) (40) GPIO21

POE:
TR01 (1) (2) TR00
TR03 (3) (4) TR02

For further information, please refer to https://pinout.xyz/


Checking the Documentation

If you are logged into the Raspberry Pi, using the pinout command is the easiest method. However, you can also check the layout from official documentation.

The Raspberry Pi Official Documentation provides details on the GPIO pin layout and hardware specifications:


You can also check the GPIO layout on pinout.xyz.

The pinout command actually references this site in its output:

# Last line of the pinout command output
For further information, please refer to https://pinout.xyz/

Conclusion

This post summarized how to check the GPIO pin layout on a Raspberry Pi.

It’s easy to make mistakes when connecting pins, so be careful when working with them. Using a reference card with the pin layout might also be a good idea.

I hope this note helps someone!

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References