Raspberry Pi 40-pin header Pinout

1 3V3 power 3 GPIO 2 (SDA) 5 GPIO 3 (SCL) 7 GPIO 4 (GPCLK0) 9 Ground 11 GPIO 17 13 GPIO 27 15 GPIO 22 17 3V3 power 19 GPIO 10 (MOSI) 21 GPIO 9 (MISO) 23 GPIO 11 (SCLK) 25 Ground 27 GPIO 0 (ID_SD) 29 GPIO 5 31 GPIO 6 33 GPIO 13 (PWM1) 35 GPIO 19 (PCM_FS) 37 GPIO 26 39 Ground 2 5V power 4 5V power 6 Ground 8 GPIO 14 (TXD) 10 GPIO 15 (RXD) 12 GPIO 18 (PCM_CLK) 14 Ground 16 GPIO 23 18 GPIO 24 20 Ground 22 GPIO 25 24 GPIO 8(CE0) 26 GPIO 7(CE1) 28 GPIO 1(ID_SC) 30 Ground 32 GPIO 12 (PWM0) 34 Ground 36 GPIO 16 38 GPIO 20(PCM_DIN) 40 GPIO 21 (PCM_DOUT)

Voltages

Two 5V pins and two 3.3V pins are present on the board, as well as a number of ground pins (GND), which can not be reconfigured. The remaining pins are all general-purpose 3.3V pins, meaning outputs are set to 3.3V and inputs are 3.3V-tolerant.

Outputs

A GPIO pin designated as an output pin can be set to high (3.3V) or low (0V).

Inputs

A GPIO pin designated as an input pin can be read as high (3.3V) or low (0V). This is made easier with the use of internal pull-up or pull-down resistors. Pins GPIO2 and GPIO3 have fixed pull-up resistors, but for other pins this can be configured in software.

PWM (pulse-width modulation)

- Software PWM available on all pins

- Hardware PWM available on GPIO12, GPIO13, GPIO18, GPIO19

SPI

- SPI0: MOSI (GPIO10); MISO (GPIO9); SCLK (GPIO11); CE0 (GPIO8), CE1 (GPIO7)

- SPI1: MOSI (GPIO20); MISO (GPIO19); SCLK (GPIO21); CE0 (GPIO18); CE1 (GPIO17); CE2 (GPIO16)

I2C

- Data: (GPIO2); Clock (GPIO3)

- EEPROM Data: (GPIO0); EEPROM Clock (GPIO1)

Serial

- TX (GPIO14); RX (GPIO15)

Documentation