Jake's Wither Killer v1.0

--== CONFIG ==--

beginSlot = 1
endSlot = 2

--== END OF CONFIG ==--

local waiting = true

function attackLoop()

  while true do

    turtle.attack()

  end

end

function sleeper()
  sleep(25)
end

turtle.select(beginSlot)
while true do

  while waiting do

    event = os.pullEvent("redstone")

    if event == "redstone" then
      waiting = false
    else
      print("Redstone signal not turned on!  Continuing to wait.")
    end

  end

  parallel.waitForAny(attackLoop, sleeper)

  shell.run("go", "down", "4")
  turtle.attack()
  shell.run("go", "up", "4")

  for i = beginSlot, endSlot do
    turtle.select(i)
    turtle.dropUp()
  end
  turtle.select(beginSlot)

  waiting = true

end