Overview

GPIO pins can be leveraged to use as a on/off signal for both input and output, and PWM. Uses include reading a button, a motion sensor, driving a LED or a buzzer.

Package gpio defines the interfaces.

GPIO registry

Package gpioreg permits enumerating all the available GPIO pins currently available.

On a Raspberry Pi 3, the following are synonyms, use the form you prefer:

• Runtime discovery:
  • gpioreg.ByName("11"): gpio number
  • gpioreg.ByName("GPIO11"): gpio name as defined per the bcm238x CPU driver
  • gpioreg.ByName("P1_23"): board header P1 position 23 name as defined by the rpi board driver
  • gpioreg.ByName("SPI0_CLK"): function clock on SPI bus 0
• Using global variables:
  • rpi.P1_23 to select the pin via its position on the board
  • bcm283x.GPIO11 for the pin as defined by the CPU

Pin registry

Package pinreg permits enumerating all the available pin headers. This includes non-GPIO pins like ground, 3.3V and 5V pins, etc.

Examples

• Toggle a LED
• Read button presses
• Detect motion via a PIR
• Make noise with a buzzer

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