Sequential Combo Lock in Minecraft (Redstone Tutorial)

Welcome back settling here and today I want to show you a concept I came up with for a redstone sequential combo lock my friend’s son was asking me if I knew a way to do this and off the top of my head I couldn’t think of anything so

I came to the Redstone lab and I built what I could so I’m gonna show you how it works and I’ll also show you in this video how to build it for yourself so first of all let me enter the combo and show you the lock in action it’s two

Three two one one and the door opens and so to clear the combo you can just press any button it’ll clear it and the door will close use this button to get out whoops yo yeah so so I’ll show you how this works it works based on the

Properties of repeater blocks so if you have a repeater pointing at another repeater and the point the repeater that’s pointing into the other repeater is powered it’ll lock the state of the other repeater so here this repeater even though it’s not reading a signal there’s nothing powering it because it’s

Locked it’s it’s still turned on because that’s the state it was in and so this is used to lock in combo States and so this set of five repeater locks is actually something called a shift register so if I press the button here we’ll see the first elements turn on and

All the other ones are off if I press another button they’ll all shift to the right by one well no matter what they’ll all shift to the right go on so here it’s on the second one I press another button again no it’s on the third one I press this button they’ll

All shift but the newest elements will be on and so this is this is my shift register and it basically it’s caused by all of these repeaters pulsing off for a very short amount of time allowing the signal of this repeater chain to make it one block farther or one repeater

Farther and so maybe you’ll see you can see this this redstone on top pulse off real quick right just pulses off real quick and allows the repeater locks to unlock for our moments you can actually see the repeater locks unlocking and so that’s what’s going on with this button

This button is exactly the same this button is exactly the same they’re just kind of covered up with some redstone so it’s a little bit harder to see the Pistons on top these are just visual you don’t need these at all I added them in so it it’d be a

Little bit easier to see so let me end with a combo two three two one oops if that one didn’t actually take and a one and so now we’ll see the combo represented in these pistons 2 3 2 1 1 it goes from back to front because the

Back are the older presses the front are the newer presses and so the Pistons show you what’s going on but what’s actually happening and how the clock works is this line this red line of redstone controls the door if this torch is on then the door is open and so this

Line of redstone comes from back here and so there’s actually three lines of redstone that feed into this line and that’s one for each button and so all of these three lines of redstone need to be completely unpowered for the door to open and what’s going on again remember

The combo is 2 3 2 1 1 so you can see that here 2 3 2 1 1 wherever the combo element is supposed to be on there’s a repeater if it’s supposed to be off there’s a torch so the torch inverts the signal and and these read from basically they read from

The repeater so the repeater lock is going into this block and and the torch inverts that and then there’s another torch that inverts that again if it’s on or off but yeah so so down here we’re just kind of reading from the shift register and making sure that it matches

The combo and if they all check out then the redstone torch down here can turn on the door can open and pressing any button is going to shift everything down by 1 and that will unless your combo is like 1 1 1 1 1 it’s definitely going to

Clear it could be the combo and it’ll close the door and so anytime you want you can always just start the combo with fresh and there’s this case it’s 2 3 – that one was yeah you have to you have to give a little bit of a delay between

Pressing the buttons so I didn’t give quite enough 1 1 the Pistons actually do help you here when when you’ve successfully entered a combo element so that is actually a nice feature but okay and that opens it so now I’ll show you how to build it for

Yourself I’m gonna use bling in it to make this go a lot faster yeah so I added a new feature to bling at it which lets you clone in place so if I select this region and hits clone the clone region will already be selected right

Here and so I can move it to the right by two let’s clone a repeat one two three four times so now I’ve got four copies of this structure and that’s all of them that I need for a single button but I’m gonna need I’m gonna need three

Buttons so we clone we move this region to the right three times three blocks and cloning repeat twice so now we can have three buttons now I want to pick my combo in this case I decided my own I counted to be one two three two one so

I’m gonna break torches going from the back here this is this is going to be the back the the buttons will be up there so one two three two one and then all of the spots I just broke a torch I’m gonna put down a repeater facing the

Line of redstone and that is how you encode your combo whatever combo you pick next we’re gonna build the shift register and so to do that you place three blocks like this break this one put a redstone torch here and redstone dust here then you’re gonna need a

Repeater going into that block and repeater locking it and some blocks underneath it and in front of it and then we’ll also need a line of redstone that goes over the whole thing and it looks like this so this is what you need to build you need to build that a bunch

Of times I’m going to use my copy and paste from bling at it because it’s way faster so let’s select this region clone let’s move it right to blocks and clone and repeats clone repeat three four okay and so that’s one again one combo element but I need one for each button

So let’s do that again select the region let’s clone this move it right 3 blocks 1 2 3 and Clinton repeat twice and there we go so now that’s the shift register and I’ll show you how that works in a moment but we’ll need a repeater going into

Each of these to make sure that the signal strength is high enough for the signals have reached all the way to the end and then similarly we want to refresh the strength of the signal coming out of each of these lines so we’ll put a repeater in each of these

Spots 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 that’s the next length of a redstone signal from this repeater and we’ll add another repeater in here and this line is what will actually power the door okay so that’s good to go then we also

Need a line of redstone here which will end up powering the or pulsing basically for the shift registers okay so now we’re gonna build the actual button that’s for the three buttons so put a block next to this repeater and then a block on each face of that and break the

Middle one and then let’s do that for each of the three buttons now we want a repeater going into this into each of these so those are going to go into the line of locked repeaters we also need a line of redstone underneath and I’ll show you what that looks like in a

Second but let’s put that line of redstone down and so now it’ll actually I’ll let me put down the buttons so that I’m using diamond here to indicate these are user facing blocks so the user will actually be able to see these whereas all the iron ones can be hidden away so

Now we have some buttons these are the actual buttons that you’re gonna press as part of the lock notice that when I press these buttons the line down here lights up and when I press these buttons this line also lights up so this line here is what’s going to actually trigger

The pulse that will control the shift registers so at the end of this line we put a block and then torch on top of that and a block on top of that’s a block next to it and also next to this so we put down two repeaters one here

One here this one you can stay on the default it’s length but this one needs to be a delay of four then we put a block here and a block here and we read the signals actually this one it doesn’t need one there read the signals coming out of it

Like this and so now we have a pulsar and actually the whole thing is done so I’m gonna actually extend I extend this out a little bit farther so we can see this line of redstone remember this line of redstone when it turns off the door will open

So the sim the combo was one two three two and watch that line of redstone and it turns off the combo lock works you can sort of see on the side this one has the middle elements on from the repeater locks it’s a little bit harder to see

The repeater locks for these other ones kinda have to get up in the machinery but you can see them so now we just need to build the actual door so I’m gonna I like to do it about like this let’s put a redstone torch here and make sure this

Gets powered by the line of redstone some diamond blocks and this is where the door is gonna go now the door should be open right now because the comet was actually been entered if I press a button though that the comet will get cleared and the door closes I can use

Bling at it to real quickly just add some add a floor here fill with diamond blocks and there we go we got a floor and we’re good to go one two three two one and again you might want to put a little button on the inside here so that

Once you do clear the combo and go through the door that doors gonna be closed so you can get back out using that button you’ll have to enter the combo to get back in again that’s how it works that’s how you build it if you

Want to extend it to have say three or four or five buttons or something that’s pretty easy you just make it wider copying these structures if you want to have more combo elements instead of having five elements you know one two three two one that’s five elements

If you want seven that’s pretty easy you just copy and paste this a couple more times if you want it much longer than that or many or more buttons than that you’re gonna have to you’re gonna have to mess around with adding repeaters in to refresh signal strength and that

Might miss with some timings so you have to play around with that to make sure that the timings are all good but actually shouldn’t be too hard but it’s very extensible and I think it’s pretty easy to understand so that’s how it works let’s tender one more time just just for

Fun three two one that’s about it thanks for watching