Pin Information

The pins on the Raspberry Pi are a little complicated. There are multiple headers on some Raspberry Pis with extra pins, and the pin numbers are not consistent between Raspberry Pi board versions.

To help make it easier, you can specify pins in any of the following three ways:

1. By function, e.g. 'GPIO18'
2. By physical Pi pin number, e.g. 'P1-7'. The format is 'P[header]-[pin]'
3. By WiringPi virtual pin number, e.g. 7

Note: If you specify a Number instead of a string, it is assumed to be a WiringPi number.

Note: Each pin is given a peripheral name, and is one of a few possibilities:

Name	Peripheral	Description
GPIOx	GPIO	General Purpose IO port x
PWMx	PWM	Pulse Width Modulator port x
TXDx	UART	Serial port x transmit pin
RXDx	UART	Serial port x receive pin
SDAx	I2C	Inter-Integrated Circuit port x data pin
SCLx	I2C	Inter-Integrated Circuit port x clock pin
MOSIx	SPI	Serial Peripheral Interface port x Master Out/Slave In pin
MISOx	SPI	Serial Peripheral Interface port x Master In/Slave Out pin
SCLKx	SPI	Serial Peripheral Interface port x Clock pin
CEx	SPI	Serial Peripheral Interface port x Chip Enable pin

Here is a table of the pin mappings on all of the support Raspberry Pi boards.

Model B Rev 1

P1 Header

Physical Pin	Wiring Pi Pin	Peripherals	|	Peripherals	Wiring Pi Pin	Physical Pin
P1-1		3.3V	|	5V		P1-2
P1-3		SDA0	|	5V		P1-4
P1-5		SCL0	|	GND		P1-6
P1-7	7	GPIO4	|	GPIO14/TXD0	15	P1-8
P1-9		GND	|	GPIO15/RXD0	16	P1-10
P1-11	0	GPIO17	|	GPIO18/PWM0	1	P1-12
P1-13	2	GPIO21	|	GND		P1-14
P1-15	3	GPIO22	|	GPIO23	4	P1-16
P1-17		3.3V	|	GPIO24	5	P1-18
P1-19	12	GPIO10/MOSI0	|	GND		P1-20
P1-21	13	GPIO9/MISO0	|	GPIO25	6	P1-22
P1-23	14	GPIO11/SCLK0	|	GPIO8/CE0	10	P1-24
P1-25		GND	|	GPIO7	11	P1-26

Model B Rev 2

P1 Header

Physical Pin	Wiring Pi Pin	Peripherals	|	Peripherals	Wiring Pi Pin	Physical Pin
P1-1		3.3V	|	5V		P1-2
P1-3		SDA0	|	5V		P1-4
P1-5		SCL0	|	GND		P1-6
P1-7	7	GPIO4	|	GPIO14/TXD0	15	P1-8
P1-9		GND	|	GPIO15/RXD0	16	P1-10
P1-11	0	GPIO17	|	GPIO18/PWM0	1	P1-12
P1-13	2	GPIO27	|	GND		P1-14
P1-15	3	GPIO22	|	GPIO23	4	P1-16
P1-17		3.3V	|	GPIO24	5	P1-18
P1-19	12	GPIO10/MOSI0	|	GND		P1-20
P1-21	13	GPIO9/MISO0	|	GPIO25	6	P1-22
P1-23	14	GPIO11/SCLK0	|	GPIO8/CE0	10	P1-24
P1-25		GND	|	GPIO7	11	P1-26

P5 Header

Physical Pin	Wiring Pi Pin	Peripherals	|	Peripherals	Wiring Pi Pin	Physical Pin
P5-1		5V	|	3.3V		P5-2
P5-3	17	GPIO28	|	GPIO29	18	P5-4
P5-5	19	GPIO30	|	GPIO31	20	P5-6
P5-7		GND	|	GND		P5-8

Model A+/B+/Raspberry Pi 2/Raspberry Pi 3/Raspberry Pi 4/Raspberry Pi Zero

P1 Header

Physical Pin	Wiring Pi Pin	Peripherals	|	Peripherals	Wiring Pi Pin	Physical Pin
P1-1		3.3V	|	5V		P1-2
P1-3		SDA0	|	5V		P1-4
P1-5		SCL0	|	GND		P1-6
P1-7	7	GPIO4	|	GPIO14/TXD0	15	P1-8
P1-9		GND	|	GPIO15/RXD0	16	P1-10
P1-11	0	GPIO17	|	GPIO18/PWM0	1	P1-12
P1-13	2	GPIO27	|	GND		P1-14
P1-15	3	GPIO22	|	GPIO23	4	P1-16
P1-17		3.3V	|	GPIO24	5	P1-18
P1-19	12	GPIO10/MOSI0	|	GND		P1-20
P1-21	13	GPIO9/MISO0	|	GPIO25	6	P1-22
P1-23	14	GPIO11/SCLK0	|	GPIO8/CE0	10	P1-24
P1-25		GND	|	GPIO7/CE1	11	P1-26
P1-27		Do Not Connect	|	Do Not Connect		P1-28
P1-29	21	GPIO5	|	GND		P1-30
P1-31	22	GPIO6	|	GPIO12/PWM0	26	P1-32
P1-33	23	GPIO13/PWM1	|	GND		P1-34
P1-35	24	GPIO19/MISO1/PWM1	|	GPIO16	27	P1-36
P1-37	25	GPIO26	|	GPIO20/MOSI1	28	P1-38
P1-39		GND	|	GPIO21/SCLK1	29	P1-40