SmelteryMk2

local drain = peripheral.wrap("back")

function on(side,time)
  redstone.setOutput(side,true)
  sleep(1)
  redstone.setOutput(side,false)
  sleep(time-1)
end

function getQuantity(drainObject)
  local tank = drainObject.getTankInfo()[1]
  local contentsTable = tank["contents"]
  quantity = contentsTable["amount"]
  return quantity

end

local ingotVol = 1296 --volume of a full ingot in mB
local smallIngotVol = 143

while true do

  if getQuantity(drain) > ingotVol then
    print("Contents is: "..getQuantity(drain))
    on("back",15)
    print("Contents is now: "..getQuantity(drain))
  elseif getQuantity(drain) > smallIngotVol then
    on("right",5)
  else
    print("Quantity is less than 1 block")
    sleep(15)
  end
end