Raspberry Pi Pinout

BCM 14 (UART Transmit)

Alt0Alt1Alt2Alt3Alt4Alt5
UART0 TXDSMI SD6DSI D10AVEOUT VID10AVEIN VID10UART1 TXD
  • Physical pin 8
  • BCM pin 14
  • Wiring Pi pin 15

This pin doubles up as the UART transmit pin, TXD. It's also commonly known as "Serial" and, by default, will output a Console from your Pi that, with a suitable Serial cable, you can use to control your Pi via the command-line.

Thus, The UART pins are useful for setting up a "headless" Pi (a Pi without a screen) and getting it connected to a network.

UART can also be extremely useful if you want to talk to Arduino or Propeller boards from your Pi, but you must make sure you disable the Serial Console in raspi-config first.

Learn more about UART