Peripheral I/O

Peripheral I/O allows to communicate with sensors and actuators using industry standard protocols and interfaces.

• General Purpose Input/Output (GPIO)

• Pulse Width Modulation (PWM)

• Serial Communication

  • I2C

  • SPI

  • UART

Links

• Raspberry Pi Pinout

• Android Things Raspberry Pi I/O

Pin Muxing

Many modern microcontroller have a cool feature: Pin Muxing. What it means is that I can ‘mux’ the pins for different purposes: such as I can use a SPI or I2C pin as GPIO (General Purpose Pin) or vice versa. In an ideal world, I would be able to ‘route’ or ‘mux’ pins freely around. In practice these ‘way switches’ are more or less limited. Reference