Version 2.x of Gordon Henderson's Arduino-like WiringPi GPIO functions, wrapped up for Ruby.
C Makefile Ruby

README.md

WiringPi

WiringPi is an implementation of most of the Arduino Wiring functions for the Raspberry Pi, this gem is a wrapper for the main wiringpi library and provides a nice OO interface with a few other handy helpers.

Installation

Install with gem install wiringpi2 or use bundler's Gemfile

source 'https://rubygems.org'

gem 'wiringpi2' # https://github.com/WiringPi/WiringPi-Ruby

then: bundle install

Example

#!/usr/bin/env ruby

require 'bundler'
Bundler.setup
Bundler.require

io = WiringPi::GPIO.new do |gpio|
  gpio.pin_mode(0, WiringPi::OUTPUT)
  gpio.pin_mode(1, WiringPi::INPUT)
end

pin_state = io.digital_read(1) # Read from pin 1
puts pin_state

io.digital_write(0, WiringPi::HIGH) # Turn pin 0 on
io.delay(100)                       # Wait
io.digital_write(0, WiringPi::LOW)  # Turn pin 0 off

You will need to run your scripts as root because WiringPi accesses /dev/mem

Reference

Pins

For a complete run-down see the pins page of the wiringpi website. alt text alt text

More

Full details on the wiringpi website.