local lastkey = computer.uptime()
local state = true
local delay = 60
function start()
 return os.spawn(function()
  while true do
   tEv = {coroutine.yield()}
   if tEv[1] == "key_down" then
    lastkey = computer.uptime()
    if not state then
     for addr in component.list("screen") do
      component.invoke(addr,"turnOn")
     end
     state = true
    end
   end
   if computer.uptime() > lastkey + delay and state then
    for addr in component.list("screen") do
      component.invoke(addr,"turnOff")
    end
    state = false
   end
  end
 end,"screenblank")
end