IC2 Miner Drill Swap Script

-- shell.run("drill_swap")
print( os.getComputerLabel() )

local running = false

while true do
    if rs.getInput("back") then
        rs.setOutput("left", true)
        rs.setOutput("bottom", true)
        term.clear()
        term.setCursorPos(1,1)
        print("Drilling On")
        sleep(2)  -- Delay to make sure rig finished moving
        turtle.drop() -- place drill
        local lastSeen = 0
        while rs.getInput("back") do
                local itemCount = 0
                for n=1,16 do
                    itemCount = itemCount + turtle.getItemCount(n)
                    sleep(.1)
                end
                if itemCount > 0 then
                    rs.setOutput("top", true)
                    lastSeen = 0
                    rs.setOutput("left", true)
                    rs.setOutput("bottom", true)
                else
                    rs.setOutput("top", false)
                    lastSeen = lastSeen + 1
                end
                if lastSeen > 6 then
                    rs.setOutput("left", false)
                    rs.setOutput("bottom", false)
                end
                sleep(10) -- hold if out of power/storage
                rs.setOutput("top", false)
                running = true
        end
    else
        term.clear()
        term.setCursorPos(1,1)
        print("Drilling Off")
        if running then
            turtle.transferTo(16)
            turtle.suck()
        end
        os.pullEvent("redstone")
    end
end