CC Countdown Redstone Clock

tArgs = {...}
if #tArgs < 2 then
  print("Usage: clocker <seconds> <output side> [monitor] [monitor side]")
  print("If a monitor exists, a side must be provided")
  print("Ex: clocker 10 left true right")
  return
end

TIME = tonumber(tArgs[1])
if TIME < 2 then
  print("Seconds must be greater than 1")
  return
end

OUTPUT = tArgs[2]
MONITOR = false
M_SIDE = "right"

if #tArgs > 2 then
  if #tArgs < 4 then
    print("Usage: clocker <seconds> <output side> [monitor] [monitor side]")
    print("If a monitor exists, a side must be provided")
    print("Ex: clocker 10 left true right")
    return
  end
  MONITOR = true
  M_SIDE = tArgs[4]
end

running = true
m = peripheral.wrap(M_SIDE)
while running do
 local time = TIME
 while time >= 0 do
  print(time.." seconds remaining")
  if MONITOR then
    m.clearLine()
    m.setCursorPos(1,1)
    m.write(time)
  end
  local first = os.startTimer(1)
  while true do
   local event, timerID = os.pullEvent("timer")
   if timerID == first then
     time = time - 1
     break
   end
  end
 end
 local second = os.startTimer(1)
 rs.setAnalogOutput(OUTPUT, 15)
 while true do
  local event, timerID = os.pullEvent("timer")
  if timerID == second then
   break
  end
 end
 rs.setAnalogOutput(OUTPUT, 0)
end