startup

-- housekeeping; this area is for cleaning up
-- redstone output sides.
term.clear()
term.setCursorPos(1,1)
term.write("Enter redstone output side:")
term.setCursorPos(30,1)
local sides = {}
  for k, v in pairs( rs.getSides() ) do
    sides[ v ] = true
  end
local side
repeat
  side = read ()
until sides[ side ]

-- test of redstone output
redstone.setOutput(side, true)
sleep(1)
redstone.setOutput(side, false)

-- autodetection and assignment of monitor side
if peripheral.isPresent("top") == true then
 monitor = peripheral.wrap("top")

elseif peripheral.isPresent("bottom") == true then
 monitor = peripheral.wrap("bottom")

elseif peripheral.isPresent("left") == true then
 monitor = peripheral.wrap("left")

elseif peripheral.isPresent("right") == true then
 monitor = peripheral.wrap("right")

elseif peripheral.isPresent("front") == true then
 monitor = peripheral.wrap("front")

elseif peripheral.isPresent("back") == true then
 monitor = peripheral.wrap("back")

else
  term.clear()
  term.setCursorPos(1,1)
  print("NO MONITOR ATTACHED!")
  sleep(1)
  os.shutdown()
end

--enter code
term.clear()
term.setCursorPos(1,1)
print("Enter Password- four digits, numbers only.")
local code
repeat
  code = read()
until #code == 4

--begin monitor pattern
monitor.setBackgroundColor(colors.gray)
monitor.setTextColor(colors.black)
monitor.clear()
monitor.setCursorPos(1,1)
monitor.setBackgroundColor(colors.lightGray)
monitor.write("       ")
monitor.setBackgroundColor(colors.lightGray)
monitor.setCursorPos(2,2)
monitor.write("1")
monitor.setCursorPos(4,2)
monitor.write("2")
monitor.setCursorPos(6,2)
monitor.write("3")
monitor.setCursorPos(2,3)
monitor.write("4")
monitor.setCursorPos(4,3)
monitor.write("5")
monitor.setCursorPos(6,3)
monitor.write("6")
monitor.setCursorPos(2,4)
monitor.write("7")
monitor.setCursorPos(4,4)
monitor.write("8")
monitor.setCursorPos(6,4)
monitor.write("9")
monitor.setCursorPos(4,5)
monitor.write("0")
monitor.setBackgroundColor(colors.red)
monitor.setCursorPos(2,5)
monitor.write("C")
monitor.setBackgroundColor(colors.lime)
monitor.setCursorPos(6,5)
monitor.write("E")