Raspberry Pi Pinout

Legend

  • GPIO (General Purpose IO)
  • SPI (Serial Peripheral Interface)
  • I2C (Inter-integrated Circuit)
  • UART (Universal Asyncronous Receiver/Transmitter)
  • Ground
  • 5v (Power)
  • 3v (Power)

BCM 21 (SPI Clock)

Alt0Alt1Alt2Alt3Alt4Alt5
PCM DOUTSMI SD13DPI D17I2CSL CESPI1 SCLKGPCLK1
  • Physical pin 40
  • BCM pin 21
  • Wiring Pi pin 29