Redstone--emptySystem

local com = require("component")
local sides = require("sides")
local list = com.list("redstone")
local rs = nil

function getInterface()
  for e in com.list("interface") do
    rs = com.proxy(e)
    break
  end
end

function setOutput(state)
  for b in list do
    com.proxy(b).setOutput(sides.down,state)
  end
end


--program
getInterface()
setOutput(1)
while rs.getItems().n > 0 do
  os.sleep(3)
end
setOutput(0)