Computercraft Wait For Clear Inventory

--Part of the mining system. Waits for something (up to you) to remove all items from a mining trip.
lastslot = 1    --The last slot that contains an item

--Change the 15 to whatever slot you want to be the last one you want it to check.
for i = 1,15 do
    if turtle.getItemCount(i) > 0 then
        lastslot = i
    end
end

repeat
sleep(0.5)
until turtle.getItemCount(lastslot) == 0