Timer

local x = 3  -- position text X
local y = 1  -- position text Y
local tArgs = {...} -- timer
local t = tArgs[1]

local monitor = peripheral.wrap("back")
local speaker = peripheral.wrap("top")

while true do
  os.pullEvent("redstone")
  if rs.getInput("bottom") then
    -- start timer
    for i = t,0,-1 do
      monitor.clear()
      monitor.setCursorPos(x,y)
      monitor.setTextScale(4)
      if i < t/5 then
        monitor.setTextColor(colors.red)
        speaker.speak(tostring(i),10,"fr")
      elseif i < t/5*2 then
        monitor.setTextColor(colors.orange)
      elseif i < t/5*3 then
        monitor.setTextColor(colors.yellow)
      elseif i < t/5*4 then
        monitor.setTextColor(colors.green)
      else
        monitor.setTextColor(colors.blue)
      end
      monitor.write(tostring(i))
      sleep(1)
    end
    -- end of timer
  end
end