Simple Dig Above Script

local delay = 15

local match = false

while true do
  match = false
  if turtle.detectUp() then
    for x=1,16,1 do
      if turtle.getItemCount(x) > 0 then
        turtle.select(x)
        if turtle.compareUp() then
          match = true
        end
      end
    end
  end

  if not match then
    turtle.digUp()
  end

  os.sleep(delay)
end