Pin one is the pin in the first column and on the bottom row. They provide 8 GPIO pins plus access to I☬, SPI, UART), as well as +3.3 V, +5 V and GND supply lines. The Raspberry Pi Model A and B boards have a 26-pin 2.54 mm (100 mil) expansion header, marked as P1, arranged in a 2x13 strip. General Purpose Input/Output (GPIO) Model A and B (Original) P1 Header. Sample circuits for interfacing the GPIOs with other electronics are shown on the RPi GPIO Interface Circuits page.To connect devices to the serial port (UART), see the RPi Serial Connection page.Sample code in many different languages is on the RPi GPIO Code Samples page.For further specific information about the Raspberry Pi4's BCM2711 GPIOs, see: RPi BCM2711 GPIOs.For further specific information about the Raspberry Pi's BCM2835 GPIOs, see: RPi BCM2835 GPIOs.However, add-on boards such as the Rpi Gertboard provide this capability. Note that no analogue input or output is available. The Raspberry PI GPIOs use 3.3V logic levels, and can be damaged if connected directly to 5V levels (as found in many older digital systems) without level-conversion circuitry. Unlike USB, etc., these interfaces are not "plug and play" and require care to avoid miswiring. Communication with chips or modules using low-level protocols: SPI, I☬, or serial UARTĬonnections are made using GPIO ( "General Purpose Input/Output") pins.Digital inputs: read an on or off state from a button, switch, or other sensor.Digital outputs: turn lights, motors, or other devices on or off.In addition to the familiar USB, Ethernet and HDMI ports, the Raspberry Pi offers the ability to connect directly to a variety of electronic devices. Other Peripherals - all sorts of peripherals used with the Raspberry Pi. Screens - attaching a screen to the Raspberry Pi.Ĭases - lots of nice cases to protect the Raspberry Pi. Low-level Peripherals - using the GPIO and other connectors.Įxpansion Boards - GPIO plug-in boards providing additional functionality. Hardware History - guide to the Raspberry Pi models. Hardware - detailed information about the Raspberry Pi boards. 2.3.3 Referring to pins on the Expansion header.
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