startup

chest = peripheral.wrap("back")

while true do

  local slot = chest.getStackInSlot(1)

  if slot ~= nil then
    if slot.qty < 32 then
      redstone.setOutput("top", false)
    else
      redstone.setOutput("top", true)
    end
  else
    redstone.setOutput("top", false)
  end
  sleep(5)

end