Redstone Timer while Lever active

local INPUT_SIDE = "left" -- change based on where your lever is
local OUTPUT_SIDE = "right" -- change based on where your output side is
local IDLE_TIME = 30 -- time (in sec) for cc to wait, rec 30, allows timer to survive reboot

--start an infini8te loop
--hold CTRL+T to stop the program
while true do
  --wait for lever to be thrown, or check if red is already active after IDLE_TIME
  parallel.waitForAny(function() e = os.pullEvent("redstone"); return true end, function() sleep(IDLE_TIME); return true end)

  --pulse the output
  while rs.getInput(INPUT_SIDE) do--while lever is ON
    write(".")  --print a dot each time we pulse
    rs.setOutput(OUTPUT_SIDE,true)--turn output on
    sleep(.2)                 --wait 0.1 sec
    rs.setOutput(OUTPUT_SIDE,false)--turn output off
    sleep(IDLE_TIME)                 --wait 0.9 sec
  end                         --rinse, repeat
end                           --rinse, repeat