Attack

-- wait till redstone... and then cool down 3000 hits
function detect()
    while not redstone.getInput(side) do
        os.sleep(30)
    end

    while redstone.getInput(side) do
        attack()
    end

    counter = 60

    while counter > 0 do
        attack()
        counter = counter - 1
    end
end

-- kill whatever is in front
function attack()
        turtle.attack()
        if turtle.getItemCount(4) > 0 then
                for x=1, 16 do
                        turtle.select(x)
                        turtle.dropDown()
                end
                turtle.select(1)
        end
    sleep(0.5)
end


-- ---------- Running programm ----------
-- Set params
side = "back"

-- repeat loop and never stop
repeat
    result, err = pcall(detect)
    if not result then
        print("Horrible nasty stuff happened...")
        print(err)
        print("Whatever happend... The killing needs to resume!")
    end

    os.sleep(60)
until false