I'm trying to make a base with a hidden door that can be opened from the inside and outside. I was wondering if there was a way of making a circuit that could be operated from two different switches allowing me to operate the door from the inside and outside.
Here is a picture that shows the hidden door in its open status.
Sorry its a bit blurred, but hopefully you can see what's happening.
Minecraft Double Switch Door
minecraft-java-editionminecraft-redstone
Related Solutions
Wiki kinda made a mistake: by the "C changes from 0 to 1 or 1 to 0" it means you can design it to be edge up trigger or edge down trigger not both. If you look at the design it self you will see that the first split from input C only send pulse transitions when you change it from 0 to 1 and when you change it from 1 to 0 it's doing nothing. So this work's alright just a little miss understanding, if you need so here the edge down design I built(just added not before the C):
I fixed this in wiki so this should be fine now.
Btw you can design both edge up and down trigger, you need to send pulse(circled in black) each time the clock is changing. Do it your self as a challenge ☺
As with most counting problems in Minecraft, the answer is eggs.
Take a look at my sample setup.
Redstone explanation
To the right, we have a monostable circuit to shorten the input (the button) down to 1 tick. I use Sethbling's favored design, the repeater is set to 3.
The Centerpiece is a Hopper-Dropper-Counter (a hopper and dropper pointing into each other), containing, in this case, 9 Eggs (or anything that stacks to 16) and 10 Cobblestone (or anything that stacks to 64), for a total of 19 items. You realize this is 1 short, but that's actually fine.
The comparator turns to 3 when all items are in the hopper. In this case, the torch at the bottom of the picture turns off.
The last component is a Repeater-Lock. On each button press, the hopper will update to whatever redstone signal is on the bottom torch before the button was pressed. So if it's at three bars after 19 clicks, it will unlock the hopper on the 20th click, causing all items to go back into the dropper.
To make something happen every 20th click, you should get the signal from the block next to the hopper (i.e. the state of the locked repeater), it is only ever off 1/20 of the time. You could put redstone dust underneath, or put a torch on top, for example (but watch out for signal inversion).
Design notice: I used a variation of this for a three state enchanting room (lvl 1, lvl 18, lvl 30 enchants), using 2 wooden swords, and repeaters checking for a signal >0 and >3, respectively.
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Best Answer
What you need is an XOR circuit.
An XOR circuit allows either switch to change the state of the door (open/closed). This means the door can be opened or closed using either switch and it doesn't matter if the other switch is up or down.
I have done this but it can be tedious trying to get the Redstone to laid out correctly. In the diagram in the link A would represent a switch on one side of the door and B would represent a the switch on the other side.