tank monitor

local tArgs = {...}
local dir = tonumber(tArgs[1]) --valve Direction
local warning = tonumber(tArgs[2]) -- Warning level in %

-- Valve and output
local tank = peripheral.wrap(dir)

local cap                -- Tank capacity
local amount             -- Amount liquid in tank
local percentfull        -- Percent liquid in tank
local lastpercent = 100  -- Percent last loop
local sleeptime          -- How long to sleep

--redstone.setOutput("left", false)

function getTank(tankPeriph)
    local tableInfo = tankPeriph.getTankInfo(dir) -- Local to the getTank function.

    for k,v in pairs(tableInfo) do
        fluidRaw = v.rawName -- local to this for loop
        fluidName = v.name -- local to this for loop
        fluidAmount = v.amount -- local to this for loop
        fluidCapacity = v.capacity -- local to this for loop
    end

    return fluidRaw, fluidName, fluidAmount, fluidCapacity -- Returning the values of global variables (which are nil).
end

-- Main prog loop, never stop

while true do

  -- Fill table with data from tank valve
  local fluidRaw, fluidName, fluidAmount, fluidCapacity = getTank(tank)

  if fluidName then
    -- Get values for tank capacity and amount

    fluidName = string.gsub(fluidName, "^%l", string.upper)

    cap = fluidCapacity / 1000

    amount = fluidAmount

    -- If tank is empty, to avoid math issues with 0

    if amount == nil then
      amount = 0
      percentfull = 0
    else

      -- Use math.floor to convert to integers
      amount = math.floor(amount / 1000)
      percentfull = math.floor(100 * amount / cap)


    end
    term.clear()
    print(fluidName)
    print(amount)
   print(percentful)
   sleeptime = 10

   end -- ends if fluidname
sleep(sleeptime)


end  --ends while true loop