All right last time we learned about the nor gate and also the or gate basically the nor gate says if either one is on the output is going to be off the or gate says that if either ones on the output is going to be on so what we’re Going to be learning about in part three here is the and and NAND gates basically what those are going to say is all of the inputs have to be on for the output to be in a certain state you know how we constructed the or from the nor gate by Putting in not gate on the output well what if we put a not gate on the input say we put a not gate there and we put a not gate there so here’s our output the center there’s going to be our inputs on the two sides basically that’s not going to change the State of it not once not going to change the state of it but if they’re both on then both of these coming into the nor gate or off allowing the nor gates torch to turn on providing power out so that’s called an and gate both have to be on For the output to be on but again that takes up a lot of space let me show you the simplified way to make an and gate including this out here and again it involves using torches not on the side of blocks on the top of blocks basically We’re going to have three blocks here middle one is going to act like our nor gate to side ones are going to act like are not gates and we connect them by putting that there so any input coming into the sides here it’s going to act as our input and Hold on now why is that not effective that there we go maybe the tuning doesn’t work for some reason interesting alright well we’ll just rearrange it okay so basically when either these set to on it’s going to turn that torch off which will no longer provide power to The middle one now that’s still providing power to the middle one that’s why it’s still on so of both have to be on the output to be on so that’s a simplified way of making it an gate with the two inputs being on the outside blocks and the output being where that Torch is now you can make an and gate with three inputs it’s a little bit more complicated just your some of this away show ya if you make an and gate like this same type of design bring the torches all like that but unfortunately it prevents us from having the input Going in directly like that they have to come in the sides like that so it does take up a little bit more space and again apparently that turning didn’t work last time so let me try it I’m gonna make sure yeah that doesn’t work for some reason that’s odd so basically It has to come pretty far out a little bit back I suppose for it to be effective but that’s one way of making a three input and gate it does take up a lot of room now my even you might be better served by just chaining and gates Together to make three inputs and then the opposite of the and gate is is done by putting an or gate on the output again but since they’re basically already is an or gate or not sorry putting a not gate on the output since they’re basically is a not gate on the Output already a NAND gate can be constructed by just making the and gate without the torch in the front so like so and then just having that come straight down that works as well so you can have the inputs on the side there if they’re both On then the output is off otherwise it’s constantly on flip one of those it doesn’t matter they both have to be on the output to be off so that’s an and gate I’ve never really come across a situation where I needed to use an and gate I’m sure there might be one but Some examples of when you might use an and gate is maybe if you want to have a locked door so you have a switch on the inside that has to be in the on position before the door can work soon so you have you know the switch which function Says your lock being one input of the and gate and then the button to open the door being the other input of the and gate so the switch on the inside has to be in the on position to the button to be able to function so basically thats Which serves as a lock or maybe like a door that requires two people to open like some nuclear launch codes or something like that so basically that’s the and and NAND gates I think I think next time we’re going to start going over memory because memory is extremely Important when you’re using buttons and buttons are very useful so catch me next time and I will go over that if you have any questions don’t hesitate to comments and I will try and answer them as best I can Video Information
This video, titled ‘MineCraft – Redstone Tutorial for Non-Engineers – Part 3’, was uploaded by GameOfDroids on 2010-10-24 23:34:13. It has garnered 57260 views and 297 likes. The duration of the video is 00:08:05 or 485 seconds.
A tutorial on redstone mechanics in Minecraft designed for someone who knows nothing about circuits.
Part 3 contains: AND gate NAND gate
Start Here: Part 1 http://www.youtube.com/watch?v=K26wQWrvuiY Part 4: http://www.youtube.com/watch?v=0VBonjTrzS0