Raspberry Pi Hardware Intro
Overview of Raspberry Pi Hardware and GPIO Pins
Updated: 03 September 2023
Most info and diagrams from the RaspberryPi documentation or pinout.xyz
GPIO Pins
The Pi has 40 General-Purpose Input-Output (GPIO) pins configured in the following way:
- 2x 5V Pins
- 2x 3.3V Pins
- 8x 0V Pins (ground)
The rest of the pins are general purpose and can be assigned to either High (3.3V) or Low (0V) using software
In addition to basic Input/Output, the pins are able to perform specific functions as follows:
Note that GPIO 0 (pin 27) and GPIO 1 (pin 28) are available on the board but reserved for special use (EEPROM)
Some useful information on the different pinouts and their functions can be found on pinout.xyz
| Function | Description | Pins |
|---|---|---|
| Software PWM | Enable a pulsing digital signal to output analogue values | All Pins |
| Hardware PWN | Enable a pulsing digital signal to output analogue values | GPIO12, GPIO13, GPIO18, GPIO19 |
| SPI0 | For connecting to peripheral devices | MOSI (GPIO10); MISO (GPIO9); SCLK (GPIO11); CE0 (GPIO8), CE1 (GPIO7) |
| SPI1 | For connecting to peripheral devices | MOSI (GPIO20); MISO (GPIO19); SCLK (GPIO21); CE0 (GPIO18); CE1 (GPIO17); CE2 (GPIO16) |
| I2C | For 2-wite communication | Data: (GPIO2); Clock (GPIO3); EEPROM Data: (GPIO0); EEPROM Clock (GPIO1) |
| Serial | Receival and Transmission of Async Signals | TX (GPIO14); RX (GPIO15) |
THe more detailed pinout diagram depicting this can be seen below: