Raspberry Pi GPIO Reference

GPIO pin reference for Raspberry Pi: BCM/Board numbering, function, voltage limits. Visual pinout diagram.

Numbering Scheme

Filter Function

Important Notes

GPIO pins are 3.3V logic - DO NOT connect 5V signals directly
Maximum current per GPIO pin: 16mA (50mA total for all pins)
Use level shifters for 5V device communication
Pull-up/pull-down resistors available on all GPIO pins
GPIO2 and GPIO3 have permanent 1.8k pull-ups (for I2C)

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