Splashes stream exp turtle

exp = peripheral.wrap("right")
exp.setAutoCollect(true)
print("Enchanter & Grinder turtle is working!")
chestDir = "dropDown" -- drop down into e.g. a chest

function drop_all_items()
    for i = 1, 15 do
        if turtle.getItemCount(i)~=0 then
            turtle.select(i)
            turtle[chestDir]()
        end
    end

    turtle.select(1)
end

function enchantItem()
    if turtle.getItemCount( 16 ) >= 1 then -- any items in the 16 slot?

        if turtle.getItemCount( 15 ) ~= 0 then
            drop_all_items()
        end

        turtle.select( 16 )  -- select 16th slot
        turtle.transferTo(15, 1)
        turtle.select(15)

        exp.enchant( 30 )  -- enchant that item with level 30
        turtle[ chestDir ]() -- drop enchanted item

        turtle.select(1)  -- select the 1st slot again
    else
        print("Error: Books / items to enchant are missing from slot #16!")
    end
end

while true do -- always run the lines below
    turtle.attack()

    if turtle.getItemCount( 1 ) > 0 then -- any items in the first slot?
        drop_all_items() -- it will drop items to the chest below
    end

    if exp.getLevels() >= 30 then -- internal EXP Level is 30 or above
        enchantItem() -- execute the fuction above
    end

    turtle.select(1)
    sleep(.2) -- we are performance-friendly, the turtle waits a bit
end -- end of loop