rpi-door.rb

#!/usr/bin/env ruby
require 'wiringpi'

# Sound files
open_sound = 'creaking-door.mp3'
close_sound = ''

# Initialise
io = WiringPi::GPIO.new
pin = 1 # GPIO 18
current_value = 0
previous_value = io.read(pin)

def play_sound(file)
  if !file.empty? then system("mpg123 -q #{file}") end
end

def get_time
  time = Time.new
  time.strftime('%Y-%m-%d %H:%M:%S')
end

# Wait for the door...
while true
  current_value = io.read(pin)
  if current_value == 0 && previous_value == 1
    print "Door opened at #{get_time}... "
    play_sound(open_sound)
  elsif current_value == 1 && previous_value == 0
    print "closed at #{get_time}\n"
    play_sound(close_sound)
  end
  sleep 0.5
  previous_value = current_value
end