OR gate. OR gates produce an output when any of their inputs are True. Hardware representation:. Levers act as toggle-able power sources. This is one of the simplest gates to build in Minecraft — you just have to connect both redstone wires together.
If one input wire turns on, so will the output wire. If both wires turn on, there is no problem — the output will just be on as well. AND gate. Here are the basics, presented as simply as possible. You should read the ' redstone basics ' introductory page first, if you haven't already. A logic gate is a circuit that is on or off depending on certain inputs.
They can be very useful. For instance, you might want to control a lamp so that it only comes on when a daylight sensor is NOT giving a signal.
Or you might want to open a door if a button is pushed OR someone is standing on a pressure plate. The best way to learn these is to built them yourself and see what happens when you flip the levers. In all cases, its input on the left, and the output is a redstone lamp on the right.
This is the simplest gate: it's a redstone torch attached to a block. If the block is powered, the torch is off; otherwise the torch is on. In other words, the output is opposite to the input. This gate is also sometimes called an inverter. This is so simple it almost doesn't count! That's all there is to it. The models below are all made compact for convenience, but they can be spread out as much as you want, provided that you add enough repeaters.
The important part is that all the connections remain intact, even if they're connected by long strings of redstone wire. This one is a block with a switch on it and some redstone coming out the other end. You flip the switch on, the redstone turns on. You flip the switch off, the redstone turns off. There's a direct relationship between turning on the switch, and turning on the redstone. If you've ever powered a redstone creation with a switch, this is the type of logic gate you used.
See, you probably didn't know that you've already used a logic gate! Don't worry about them, because you don't have to memorize what each one does. That's what this guide is for, and I assure you that there's no test at the end! When you turn the switch on, the redstone turns off. When you turn the switch off, the redstone turns on. You use this if you have a mechanism that you want to always be on, except when you flip a switch.
Like if you want pistons to be constantly extended until you flip the switch and then they pull back, you would use a NOT gate. I personally don't find too much use for AND gates because I play on a Creative Server, but there are applications for everything. An AND gate will only turn on the redstone if both levers are in the on position.
This means that you can have greater control over your mechanisms. For example, say that you have one switch inside your home, and one switch outside your home and they both control the same door. If those two switches are connected by an AND gate, you can turn the switch inside your home off and no one outside your home will be able to get in, no matter how many times they flip the outside switch.
This gate is really simple. Just two switches attached to a block with redstone coming out of it. The OR gate outputs the signal when either lever is turned on, regardless of the state of the other. When any switch is turned on, the power is turned on. So, the power only turns off when both switches are off.
Using the same door example from the AND gate, this OR gate would do the exact same thing, just with a reversed power output. That is, when either switch is on, the power is off. Again, either switch can activate the redstone by being turned off, but it can only be deactivated if both switches are on. This is useful when you want to make things like traps or doors, where you want the natural state of a piston to be on, and have it be able to be turned off at will by anyone on either side of the door.
A NOR gate looks just like an OR gate with an extra redstone torch, and its functionality is opposite. These send signals up, but not down. It is expandable, like design C.
Whenever at least one switch is toggled to "on", the output is toggled to "off". The only time the output is "on" is when all inputs are toggled to "off". This gate also uses two or more inputs. All logic gates can be made from some combinations of the NOR gate. In Minecraft , NOR is a basic logic gate, implemented by a torch with two or more inputs.
A torch can easily accommodate 3 mutually isolated inputs, as in design A. Design B goes to greater lengths to squeeze in a fourth input. If more inputs are necessary, it is simplest to use OR gates to combine them, then use an inverter NOT at the end. The output is toggled to "on" only when all inputs are "on". Otherwise, the output will remain "off". In reality, the image provided is a NOR gate with inverted inputs.
A typical use for an AND gate would be to build a locking mechanism for a door, requiring both the activating button and the lock typically a lever to be on. Piston AND gates act similarly to a "tri-state buffer", in which input B acts like a switch, connecting or disconnecting input A from the rest of the circuit.
Such designs have one input feeding a circuit, which is opened or closed by a sticky piston driven by the other input.
The difference from real-life tri-state buffers is that one cannot drive a low current in Minecraft. All logic gates can be made from NAND gates.
All logic gates can be made from some combinations of the NAND gate. XOR is pronounced "zor" or "exor", a shortening of "exclusive or", because each input is mutually exclusive with the output. It is useful for controlling a mechanism from multiple locations. Because of these properties, XOR gates are commonly found in complex redstone circuits. A useful feature is that an XOR or XNOR gate will always change its output when one of its inputs changes, hence it is useful for controlling a mechanism from multiple locations.
When controls such as levers are combined in an XOR gate, toggling any control will toggle the XOR gate's output like a light bulb controlled by two light switches — players can flip either one to turn the light on or off, or either of which can always open or close a door, or turn some other device on or off. The result of XORing more than two inputs is called "parity" — the result is 1 if and only if an odd number of inputs are 1.
Design D is tiny, but only useful if players want the levers to be fixed to the circuit. The shaded block indicates the block the levers and the lit torch are attached to, along with the block that one is resting on.
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