Heres the guide

Hehe, pretty awesome right?

haha, awesome!

ghetto security! nice

might have to do that...how strong is it?

Funny that you post that now...I'm going to be working on coding a microcontroller to operate as a combination lock with a 12 button (telephone style) keypad. It's for a class, but I was considering hooking it up to a linear actuator for my own use... I think now I may have to go ahead and do it.

thats pretty freaking sweet!

WOW thats pretty neat...

awesome! lol, take pics when your done

@gotjamo, it just unlocks your door when you enter the correct code IE: it turns your door lock Pretty simple actually.

Hehe, now that i think about it, you could probably design a program to use a serial port as a means to unlock the door instead of using that micro controller. Maybe have a touch screen on the outside of the door? HAHA, that would be awesomly cool and probably simpler (hardware wise)

if you put that in a dorm or something, people would be like what the heck and think you're a god
thats pretty ghetto though, quite cool what can be done with simple hardware.

Surely if you had a touch screen on the outside of your house someone would just steal it?

Lol cool!!

great for keeping pesky sisters out Just a shame my door doesn't have a lock quite like that, but then i suppose i could rig it to turn a key
good work

Btw glimmerman, that looks like it is inside his house so you would have a pretty limited pool of suspects lol.

There looks to be quite a flaw with his design....

*cuts the keyboard wire and runs away with keyboard while owner is out of the room*.......... bet he wouldn't feel so smart then

Dude, it is in the guys house lol. So you are unlikely to get the keyboard nicked and if so the sibling who did it gets the smack-down from the parents. It would not get broken, full stop.

It sounded to me like he was in some College / Uni accomodation, and if it's anything like the Uni I went to... pretty much anyone could have run away with the keyboard if they really wanted to

Lol, I'd have the thing removable, IE: buy a laptop NUM pad, cut it, and hook it up to maybe some XLR connectors or something, and VOILA! That solved that problem

are u paranoid or something? from ur other threads of u havign so much protection on ur computer that no1 can access it and stuff, it seems like ur afraid of any1 getting in your room, why dont u just hibernate in there or something

hahah that was funny lol, im going to put that in my sig . Cool contraption anyways. You should make one with a fingure print reader instead thou, o and a keyboard sorta like a double password then youl be reallly secure lol

I had forgotten about this thread, but now that it is revived, here is the combination lock I was talking about earlier.

All it does right now is light up the LEDs depending on what has been entered. It would be pretty easy to hook up a solenoid or actuator to fire as a lock mechanism, but I would need to modify the code a little.
The code that is in it currently is the result of 3 people coding for about 10 hrs together.

*features*

• .5 second flash on red every 4 seconds to indicate locked status
• 2 second flash on green when unlocked
• 2 second flash on red when wrong code entered
• 40 second flash on red when wrong code entered 3 times, no input allowed
• timeout after 4 seconds if code entry started and left unfinished.
• combination change mode after correct entry

now that is worth it, u have a guide on how to construct one of those to unlock a door?

I don't see why anyone would do this, except to keep pesky younger siblings out. I mean, I know my buddies would just break my door open lol

Well it's pretty simple really. Learn assembly and get a basic understanding of microcontrollers. Well, simple in theory...

The keypad is just 12 buttons that connect 2 of 7 pins at any given time. You actually have to use some logic and reading voltage changes on the pins of the microcontroller to determine which switch was pressed. The keypad doesn't actually send a '4' or whatever to the chip.

The little black 16 pin dip is the heart of the thing. It's a Freescale Semiconductor HCS08 microcontroller. (Those are AA batteries to give you a size reference.)
The lock works by comparing a series of voltage changes caused by pressing keys and comparing them to the established "combination"