basic_recipes.md

Basic Recipes

The following recipes demonstrate some of the capabilities of the GPIO Zero library.

Starting GPIO Zero

The GPIO Zero library needs to be required at the top of the file:

require 'gpio_zero'

and to start using the library create an instance:

gpio = GpioZero.new

All the devices are now available:

# Create a generic output device on pin 4
output = gpio.output_device 4

Pin numbering

Like the Python library, this library uses Broadcom (BCM) pin number for the GPIO pins, as opposed to physical (BOARD) numbering. See the Python documentation for further explanation and a diagram.

LED

Turn an LED on and off repeatedly:

require 'gpio_zero'

gpio = GpioZero.new
led = gpio.LED(17)

loop do
  led.on
  sleep 1
  led.off
  sleep 1
end