If you need a redstone current to turn on and off in slow pulses, such as in my recent Minecraft Lighthouse project or for some piston contraption, the 5-clock is the go-to circuit for the job. Usually it looks something like the diagram pictured to the right, taking up a fairly large amount of space for the desired five-tick pulse cycle.
Another method, which takes up a bit less space, uses redstone repeaters wired up in a circle, much to the same effect. Thanks to the adjustable delay on repeaters, as well as their current-extending properties, you can pretty much add additional repeaters on to create whatever delay you want.
After making the aforementioned lighthouse with a repeater clock, I wanted to add a switch so it could be toggled off and on at will. I came up with the modification shown below. When the switch is in the upward position, it kicks out the initial signal to start the clock, and it can keep looping, passing through the block each time. If you flip the switch, it becomes an OR gate and forces the loop to stop. The output wire, which leads to the lamp on the lighthouse, could be hooked up to any of the redstone wires.
A new world (revision 19) recently went live on the Nerd.nu survival server, so I decided to do something cool and new. In addition to starting work on a “bottomless tower” (building downward instead of up) just for the novelty of it, I threw together a working lighthouse on the tiny land formation in the harbor. It has a compact 5-clock powering glowstone lamps up top, with vertical torches transmitting the signal.
Unfortunately, the circuit tends to glitch and freeze up after awhile, and the light gets stuck on or off. Fixing it requires punching out and replacing a Redstone wire, then pushing the reset button nearby. I don’t know whether this is a limitation of the server, the game, or my repeater-based clock circuit.
If you log on to the server (
s.nerd.nu), you’ll find it along the brown road.
Update: You can get a closer look at the (since improved) circuit powering the lamp here.
Glowstone block goes under the enchanting table. Now it looks 75% more magical.
If you’re playing Minecraft on a server that encourages PvP, it’s kind of important to have some form of security mechanism. Otherwise you’ll be considered an easy target, and players will constantly try to kill you.
The most common deterrent is to simply use iron doors, with a lever on the inside to open and close them, instead of simple wooden doors. However, anyone who’s tried to set up double-doors that open at the flip of a single switch, knows just how irritating it is. You need to have a redstone circuit that applies power to both doors at once, and those circuits often take up too much room. Unless you planned your base to have an outer wall and an exterior wall, with a large gap between them, you might be stuck having exposed redstone paraphernalia.
Since I don’t like having exposed wiring, I figured out a method of making a compact double-door mechanism that won’t require you to butcher your nice building to make it work.
This is what it looks like from below.
I bet that got your attention. That ensures that both doors open and close at the pull of the lever, while using far less space than what you’d find in most YouTube tutorials. The mechanism fits into a single row of blocks.
Of course, there are two layers of blocks involved here. The row that contains the mechanism and door is technically that one block-thick wall I was talking about earlier, but there’s a big stone staircase on the outside of the tower that conveniently covers it up. So I lucked out and had a two block-thick wall in this case.
You can see how it works a little better in this shot. The two dirt blocks have a single piece of redstone wire on top, with two repeaters in the middle. The left one brings the current down from the switch, the repeaters carry it over to the next block, which carries it back up to the second door. The switch is next to the left door, so it opens it simply by being in proximity. (Ignore the blank space on the bottom row of stone, I accidentally mined it.)
In the view from above, you can see the little dots of redstone wire on the dirt blocks. The one on the right is close enough to power the right-side door, and the lever sends power directly to the left door, as well as downward to the repeaters.
It’s an elegant solution, if you don’t mind a tiny repeater lag before the second door is triggered, and simple enough once you have it figured out.