RFID door

--If you want this to start at every boot of a computer run the following line of code in the startup
-- shell.run("RFID","door")


--The door stays open as long as you stay in the area of the reader
--              !!! Make sure there is no creeper behind you !!!

-- Set up your own door system
doorPass = "wsxedcrfvbgtnhzmjuzvrnzcif" --Max Length 82 chars
cardLabel = "Ident: Front Door"     --Max Length 20 chars
--Make sure the following sides are equal to your build
readerSide = "left"
writerSide = "right"
redstoneSide = "bottom"

--Variables (Don´t change)
tArgs = {...}
lastTimer = {}

-- Check the arguments given
if #tArgs < 1 then
    print("Usage:")
    print("RFID write")
    print("RFID door")
    return
end

mode = tArgs[1]
shell.run("clear")

if mode == "write" then
    writer = peripheral.wrap(writerSide)
    print("Enter writing mode")
    print("Insert card in the writer")
    while not writer.isPresent() do --Waits until a card is in the writer
        sleep(0)
    end

    if writer.encode(doorPass, cardLabel) then --Start write to card
        print("Start writing Pass to card")
    else --Error handling
        if writer.isCoded() then
            print("Card is already coded\nInsert a blank card")
        elseif #cardLabel > 20 then
            print("Card Label is too long max. 20 char")
        elseif #doorPass > 82 then
            print("Data is too long max. 82 char")
        else
            print("Leave the card in the writer")
        end
        return
    end
    os.pullEvent("rfid_written") --Wait until the card is written
    print("RFID card is coded")
    print("Take the card out of the writer")

    while writer.isCoded() do --Ends the program when the card is taken out of the writer
        sleep(0)
    end
    shell.run("clear")

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elseif mode == "door" then
    reader = peripheral.wrap(readerSide)
    print("Door Contol is running")
    while true do
        reader.scan() --Creats an "rfid_detected" when a card is in range
        event, p1 = os.pullEvent()
        if event == "rfid_detected" then
            if p1 == doorPass then
                rs.setOutput(redstoneSide, true)
                lastTimer = os.startTimer(1)
            end
        elseif event == "timer" and lastTimer == p1 then
            rs.setOutput(redstoneSide, false)
        end
    end
end