Raspberry Pi GPIO Pinout
This GPIO Pinout is an interactive reference to the Raspberry Pi GPIO pins, and a guide to the Raspberry Pi's GPIO interfaces. Pinout also includes hundreds of pinouts for Raspberry Pi add-on boards, HATs and pHATs .
SPI at Raspberry Pi GPIO Pinout
Known as the four-wire serial bus, SPI lets you attach multiple compatible devices to a single set of pins by assigning them different chip-select pins. To talk to an SPI device, you assert its corresponding chip-select pin.
1-WIRE at Raspberry Pi GPIO Pinout
One-wire is a single-wire communication bus typically used to connect sensors to the Pi. The Raspberry Pi supports one-wire on any GPIO pin, but the default is GPIO 4. To enable the one-wire interface you need to add the following line to /boot/config.txt, before rebooting your Pi:
I2C at Raspberry Pi GPIO Pinout
GPIO 2 and GPIO 3 - the Raspberry Pi's I2C1 pins - allow for two-wire communication with a variety of external sensors and devices. The I2C pins include a fixed 1.8 kΩ pull-up resistor to 3.3v. They are not suitable for use as general purpose IO where a pull-up might interfere.
GPCLK at Raspberry Pi GPIO Pinout
General Purpose Clock pins can be set up to output a fixed frequency without any ongoing software control. The following clock sources are available:
Ground at Raspberry Pi GPIO Pinout
The Ground pins on the Raspberry Pi are all electrically connected, so it doesn't matter which one you use if you're wiring up a voltage supply. Generally the one that's most convenient or closest to the rest of your connections is tidier and easier, or alternatively the …
UART at Raspberry Pi GPIO Pinout
UART is commonly used on the Pi as a convenient way to control it over the GPIO, or access the kernel boot messages from the serial console (enabled by default). It can also be used as a way to interface an Arduino, bootloaded ATmega, ESP8266, etc with your Pi.
JTAG at Raspberry Pi GPIO Pinout
JTAG is a standardised interface for debugging integrated circuits which you can use to debug your Raspberry Pi. There are two separate JTAG interfaces available on the Pi: Alt5 on GPIOs 4, 5, 6, 12 and 13; Alt4 on GPIOs 22, 23, 24, 25, 26 and 27
PCM at Raspberry Pi GPIO Pinout
PCM (Pulse-code Modulation) is a digital representation of sampled analog. On the Raspberry Pi it's a form of digital audio output which can be understood by a DAC for high quality sound.
GPIO 27 at Raspberry Pi GPIO Pinout
Orientate your Pi with the GPIO on the right and the HDMI port(s) on the left. GPIO (General Purpose IO) SPI (Serial Peripheral Interface) I 2 C (Inter-integrated Circuit) UART (Universal Asynchronous Receiver/Transmitter) PCM (Pulse Code …