startup

rednet.open("top")

while true do
  sender, msg = rednet.receive()

  if msg == ("open")then
    rs.setOutput("back" , true)
    sleep(5)
    rs.setOutput("back" , false)
  end
  if msg == ("open2")then
    rs.setOutput("back" , true)
  end
  if msg == ("close")then
    rs.setOutput("back" , false)
  end
end