/turtle/mobFarm

while true do
    os.pullEvent("redstone")
    print("Turtle on attack mode.")
    while redstone.getInput("back") do
        turtle.attack()
        sleep(2)

        for i=1,8 do
            turtle.select(i)
            turtle.dropDown()
        end
        turtle.select(1)
    end
    print("Turtle on passive mode.")
end