Making a Password Protected Door

This tutorial covers on how to make a computer output redstone current when the right password is typed in. The current is then used to trigger an iron door.

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Easier to understand code

Type 'edit startup' and type in this code: (Use Ctrl + T to terminate the program, all code is explained in the comments, the --'s. It's good to read the comments, so you actually know what the code does, you do not need to have the comments in your code, of course)

local side = "left" -- Change left to whatever side your door / redstone is on, E.G: left, right, front, back, bottom, top. Be sure to leave the "s around it, though
local password = "bacon" -- Change bacon to what you want your password to be. Be sure to leave the "s around it, though
local opentime = 5 -- Change 5 to how long (in seconds) you want the redstone current to be on. Don't put "s around it, though
while true do 
 term.clear() -- Clears the screen
 term.setCursorPos(1,1) -- Fixes the cursor position
 write("Password: ") -- Prints 'Password: ' to the screen
 local input = read("*") -- Makes the variable 'input' have the contents of what the user types in, the "*" part censors out the password
 if input == password then -- Checks if the user inputted the correct password
  term.clear() -- Already explained up top
  term.setCursorPos(1,1)
  print("Password correct!") -- Prints 'Password correct!' to the screen
  rs.setOutput(side,true) -- Output a redstone current to the side you specified
  sleep(opentime) -- Wait the amount of seconds you specifed, then..
  rs.setOutput(side,false) -- Stop outputting a redstone current
 else -- Checks if the user didn't input the correct password
  print("Password incorrect!") -- Prints 'Password incorrect!' to the screen
  sleep(2) -- Waits 2 seconds
 end
end

Stop people from terminating your lock

If you don't want people holding CTRL+T and quitting your lock, use this code at the top of your program:

os.pullEvent = os.pullEventRaw

If you don't add this code to the top of your program, someone could terminate the lock and enter in a command and they can unlock your door without knowing the password. Adding the code is useful in Multiplayer.

To re-enable the ability to terminate the program, you must first make a copy of os.pullEvent, then you can restore it later.

local pullEvent = os.pullEvent
os.pullEvent = os.pullEventRaw

-- If the desired conditions are met, you can run this line to allow the program to be terminated.
os.pullEvent = pullEvent