rednet.open("bottom")
state = 1
while true do
  launch = rednet.receive("launch", 1)
  if launch then
   if(state == 1) then
     redstone.setOutput("left", false)
     state = 0
   else
     redstone.setOutput("left", true)
     state = 1
    end
  else
    redstone.setOutput("left", false)
  end
  os.sleep(1)
end