startup

sleepTime = 25

while true do
    turtle.select(1)

    while redstone.getInput("front") do
        turtle.suck()
        turtle.suck()

        amount = 42
        itemCount = turtle.getItemCount(3)

        if itemCount <= amount then
            amount = amount - itemCount
            turtle.select(3)
            turtle.suckUp(amount)
            turtle.select(1)
        end

        turtle.dropUp()
        turtle.select(2)
        turtle.dropUp(20)
        turtle.dropDown()
        turtle.select(3)

        item = turtle.getItemDetail()
        if item and item.name == "minecraft:blaze_powder" then
            turtle.dropDown()
        end

        turtle.drop()
        turtle.select(1)

        i = 0
        while i < sleepTime do
            os.setComputerLabel("Sleeping for: "..sleepTime-i.." seconds")
            i = i + 1
            sleep(1)
        end
    end

    sleep(.1)
end