emptier.lua

local side = "right"

local function on()
  rs.setOutput(side, true)
end

local function off()
  rs.setOutput(side, false)
end

local function check()
  local s = peripheral.call(side, "size")
  local items = peripheral.call(side, "list")
  io.write(".")
  for i = 1, s do
    io.write(".")
    if items[i] then
      io.write(".")
      return true
    end
  end
  io.write(".")
  return false
end

local function switch()
  while check() do
    on()
    os.sleep(0.2)
    off()
    os.sleep(0.2)
  end
end

while true do
  print()
  io.write("Running check")
  if check() then
    print()
    print("Check passed (items in inventory), emptying.")
    switch()
    print()
    print("Done.")
  else
    print("Check failed (no items in inventory), idling.")
  end
  os.sleep(5)
end