TurtleDoor

modem = peripheral.wrap("left")
modem.open(5)

function getState()
  local f = fs.open("state", "r")
  state = f.readLine()
  f.close()
  return state
end

state = getState()

function setState(stateInput)
  state = stateInput
  local f = fs.open("state", "w")
  f.write(state)
  f.close()
end

function open()
  turtle.dig()
  turtle.forward()
  turtle.dig()
  turtle.back()
  setState("open")
end

function close()
  turtle.forward()
  turtle.place()
  turtle.back()
  turtle.place()
  setState("closed")
end

while true do
  e, _, _, _, message = os.pullEvent("modem_message")
  if message == "machine_room_open" and state == "closed" then
    open()
  elseif message == "machine_room_close" and state == "open" then
    close()
  end
end