timer

--[[===================

Made by: Nemo Eriksson
Pastebin: p7sMDXJM
Description: Displays an notification on monitor when timer has run out

====================]]--

-- Recommended monitor size: 3x2

function setTimer(timeAmount, timeUnit)
  -- Gets monitor and does some config stuff
  local monitor = peripheral.find('monitor')
  monitor.setTextScale(5)
  monitor.setTextColor(colors.red)
  monitor.clear()

  -- Speaker stuff
  local speaker = peripheral.find('speaker')
  local timerSound = 'block.glass.break'

  -- Calculates [delay]
  local unitConversion = {
    ['sec'] = 1,
    ['min'] = 60,
    ['hour'] = 3600
  }
  local delay = timeAmount * unitConversion[timeUnit]

  -- Print that timer has started
  print('Timer started at:', os.date())
  print('Timer duration:', timeAmount, timeUnit)

  -- Delays
  for second = 1, delay, 1 do
    os.sleep(1)
  end

  -- More monitor config
  monitor.clear()
  monitor.setCursorPos(1,1)

  -- Timer has gone off
  monitor.write('! ! !')
  monitor.setCursorPos(1,2)    -- Moves to next line to fill screen with !!!
  monitor.write('! ! !')
  print('Timer has gone off at', os.date())

  -- Play alarm sound forever until program is terminated
  while true do
    speaker.playSound(timerSound)
  end
end

-- Main
local args = {...}
setTimer(args[1], args[2])