Difference between revisions of "Making a Password Protected Door"

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First, you need to craft a computer, and connect the back to an iron door with redstone. Like this:
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First, you need to craft a computer, and connect the back to an iron door with redstone, or just have a Computer next to the door.
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[[File:Tutorial1.png]]
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[[File:cTutorial2.png]]
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Once you're done with the basics, open the computer and edit the "startup" file. (type in 'edit startup')
 
Once you're done with the basics, open the computer and edit the "startup" file. (type in 'edit startup')
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<pre>
 
<pre>
 
while true do
 
while true do
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term.clear()
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print ("Enter Password")
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term.setCursorPos(1, 1)
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input = read()
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print("Please Enter Password:")
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input = read("*")
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</pre>
 
</pre>
  
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The first line opens a loop that will continue running forever, or until we explicitly exit it with the 'break' keyword. The second and third lines clear the screen of whatever may have been on it, and then set the cursor position to the top-left corner of the screen. This ensures that each time the program loops, the text appears in the same place. The fifth line assigns whatever the user types to the variable 'input'. So for example, if I typed "qwerty", it would be assigning "qwerty" to the 'input' variable. In the read call on the third line ('read("*")'), the asterisk character will be used to replace each letter typed by the user, so that the password stays hidden.
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The first line opens a loop that will continue running forever. The second lines "Prints" the message Enter Password on the screen. you can get rid of this if it's not wanted. The third line is used to change what the characters you type into the computer appear as. If you put ("*") after read, then it will appear in asterisks, While leaving it as is will show the password.
  
 
Here are the next few lines added on:
 
Here are the next few lines added on:
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<pre>
 
<pre>
 
while true do
 
while true do
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term.clear()
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print ("Enter Password")
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term.setCursorPos(1, 1)
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input = read()
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print("Please Enter Password:")
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if input == "password" then
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input = read("*")
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print ("Password Accepted")
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if input == "password" then
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rs.setOutput("right", true)
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  redstone.setOutput("back", true)
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sleep()
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  sleep(2)
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  redstone.setOutput("back", false)
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end
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end
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</pre>
 
</pre>
  
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The first line we add, 'if input == "password" then' checks whether or not the 'input' variable contains the string "password". The three lines immediately following are only executed if the password is correct. So if it's correct, 'redstone.setOutput("back", true)' sets the redstone output on the back side to true (on), which opens the door. The program then wait two seconds ('sleep(2)'), and turns the redstone output back off again. The program then reaches the end of the loop and repeats.
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The fourth line makes it so that if the word PASSWORD is typed, that it will go on to next steps. change the word "Password" to your desired password. The fifth line tells the computer to print Password Accepted if you correctly input the password. The sixth line outputs a redstone current on the given side. change "right" to the side you want to output a current. the seventh line tells the computer to halt the program for the given amount of time (Meaning it keeps door open for that amount of time)
  
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Please note that this is the basic format for a computer protection program as well. We would put this program in the startup file and instead of outputting redstone signals if the password was correct, we would use the break keyword instead to exit the loop and allow access to the rest of the computer.
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now, for the FINAL lines.
  
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Note also that if the program fails somehow, pressing and holding Ctrl + T will terminate it and allow you to edit it, see the [http://computercraft.info/wiki/index.php?title=Making_a_Password_Protected_Door#Stop_people_from_terminating_your_lock No termination section] to stop people from exiting your lock.
 
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= Alternative Code =
 
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Type 'edit startup' and type in this code:
 
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(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)
 
 
<pre>
 
<pre>
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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
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while true do
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local password = "bacon" -- Change bacon to what you want your password to be. Be sure to leave the "s around it, though
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print ("Enter Password")
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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
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input = read()
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term.clear() -- Clears the screen
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if input == "password" then
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term.setCursorPos(1,1) -- Fixes the cursor position
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print ("Password Accepted")
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write("Password: ") -- Prints 'Password: ' to the screen
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rs.setOutput("right", true)
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local input = read("*") -- Makes the variable 'input' have the contents of what the user types in, the "*" part censors out the password
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sleep()
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if input == password then -- Checks if the user inputted the correct password
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rs.setOutput("right", false)
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term.clear() -- Already explained up top
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else print ("Incorrect Password")
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term.setCursorPos(1,1)
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end
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print("Password correct!") -- Prints 'Password correct!' to the screen
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rs.setOutput(side,true) -- Output a redstone current to the side you specified
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sleep(opentime) -- Wait the amount of seconds you specifed, then..
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rs.setOutput(side,false) -- Stop outputting a redstone current
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os.reboot() -- Reboot the computer, reopening the lock
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else -- Checks if the user didn't input the correct password
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term.clear()
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term.setCursorPos(1,1)
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print("Password incorrect!") -- Prints 'Password incorrect!' to the screen
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sleep(2) -- Waits 2 seconds
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os.reboot() -- Reboot the computer, reopening the lock
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end
 
end
 
</pre>
 
</pre>
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The eighth line turns OFF the redstone current on the line, thus closing the door. The nint line indicates that if the password ISN'T correct, that it will print Incorrect Password. The final two lines end the program.
  
 
= Stop people from terminating your lock =
 
= Stop people from terminating your lock =
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<pre>os.pullEvent = os.pullEventRaw</pre>
 
<pre>os.pullEvent = os.pullEventRaw</pre>
  
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= Stop Editing This =
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Everyone needs to stop editing this. Note: The above information is FALSE and will likely screw everything up in your computer. don't use it, it's not
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worth it.
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[[Category:Tutorials]]
 
[[Category:Tutorials]]

Revision as of 04:50, 24 July 2012

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.


How to make it

A password protected door is actually pretty easy, if you break it into steps.


First, you need to craft a computer, and connect the back to an iron door with redstone, or just have a Computer next to the door.

Once you're done with the basics, open the computer and edit the "startup" file. (type in 'edit startup') This will make it so the program will be executed when the computer boots.

Once you access the startup file, enter in these five lines. 

while true do
print ("Enter Password")
input = read()

The first line opens a loop that will continue running forever. The second lines "Prints" the message Enter Password on the screen. you can get rid of this if it's not wanted. The third line is used to change what the characters you type into the computer appear as. If you put ("*") after read, then it will appear in asterisks, While leaving it as is will show the password.

Here are the next few lines added on: 

while true do
print ("Enter Password")
input = read()
if input == "password" then
print ("Password Accepted")
rs.setOutput("right", true)
sleep()

The fourth line makes it so that if the word PASSWORD is typed, that it will go on to next steps. change the word "Password" to your desired password. The fifth line tells the computer to print Password Accepted if you correctly input the password. The sixth line outputs a redstone current on the given side. change "right" to the side you want to output a current. the seventh line tells the computer to halt the program for the given amount of time (Meaning it keeps door open for that amount of time)

now, for the FINAL lines. 

while true do
print ("Enter Password")
input = read()
if input == "password" then
print ("Password Accepted")
rs.setOutput("right", true)
sleep()
rs.setOutput("right", false)
else print ("Incorrect Password")
end
end

The eighth line turns OFF the redstone current on the line, thus closing the door. The nint line indicates that if the password ISN'T correct, that it will print Incorrect Password. The final two lines end the program.

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
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