ComputerCraft - TE Tank Monitor

local statusChannelID = 5

-- Find Modem
local modem = peripheral.find("modem", function(n, o) return o.isWireless() end)

-- Find TE Tank
local tank = peripheral.find("thermalexpansion_tank")
if tank == nil then
   error("Could not bind to TE Tank. Is one attached?")
end

term.clear()
term.setCursorPos(1,1)
print("TE Tank Monitor...")
print()
print("Tank Contents: ")
print("Fill Percentage: ")
print()
if ( modem == nil ) then
   print("Modem not present. No status reports.")
else
   print("Modem present. Status reports sent on channel " .. statusChannelID)
end
print()
print("Press 'q' to quit")

local status = {}
local pollTimer = os.startTimer(0)
while true do
   local event, p1, p2, p3, p4 = os.pullEvent()
   if event == "key" then
      if p1 == keys.q then
         term.setCursorPos(1,11)
         return
      end
   elseif event == "timer" and p1 == pollTimer then
      local info = tank.getTankInfo()
      local maxCapacity = info[1].capacity
      local curCapacity = info[1].contents.amount
      local fillP = math.floor((curCapacity/maxCapacity) * 100)
      local tankLabel = "Fluid " .. info[1].contents.rawName
      status[tankLabel] = fillP .. "%"
      if modem ~= nil then modem.transmit(statusChannelID, 0, textutils.serialize(status)) end
      term.setCursorPos(16, 3)
      term.write(info[1].contents.rawName .. "                          ")
      term.setCursorPos(18, 4)
      term.write(fillP .. "%        ")
      pollTimer = os.startTimer(5)
   end
end