![]() ![]() 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. ![]()
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