All builds electric

As the name implies, I want this to be a super thread of people posting things you can make/do with electricity. By that I mean any sort of electric functions, like clocks and timers, or memory devices, or creative builds with interesting electrical devices built in.

We can post them in the comments here, and this will ultimately help everyone's understanding of JJX electricity, and fuel creativity. Oh, and give pictures please

Favorite Creations in General
Mob Arena concept and theoretical design (SuperNintendo)

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Wiring

Most complex/Ingenious
-An electric timer? No idea, it's beyond my understanding (TwelveFoot)
https://youtu.be/OQiWltD3AxQ

Advanced calculator (MultiPackWolf)

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Most Practical/Simple
Let's you know what wires are active (MultiPackWolf)

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[TwelveFoot]

https://youtu.be/OQiWltD3AxQ

No wires are required! The lever turns the light on!

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No wires are required! The lever turns the light on!

You guys will thank me later!

No wires are required! The lever turns the light on!

You, sir, are a god. In EVERYTHING!

I made this. It's sorta like an Automatic Gladiator Ring (for Forever Alones). When you step inside, you will be given some time to get ready and then the first horde will bounce out (10 zombies and skeletons) and some time will be given when fighting them and after that time passes a new horde will dash out out (5 skeleton archers, 5 skeleton mages, 5 skeleton iron knight, 5 skeleton gold knight).

Difficulty: Moderate then, Very Hard

Concept

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Wiring

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It's sorta like a timer thing, but why not make it something?

If you can make it in creative, and turn it into single player (people do it sometimes using hexidecimals), that would actually be pretty darn awesome.

What I honestly wanna see is an adventure map based largely off some unique logic systems, like yours

I got quoted, yay! I will be playing with the new electronics. I wilk try to make a combination lock door. Thanks for my build being your favorites in general!

Since there is an infinite possibility of what you can do with electronics, I could say the one who can guess that is a God.

Well... I'll give you a hint, it's the first simple electronics circuitry problem taught to comp sci students. It's a step above the simple on / off, but below most complicated things.

You better finish now cause I'm excited for it
And guys, keep creating. That arena is actually so sick. It would be cool If there was a bunch of different creations that we can learn from

I am completely clueless Vanc, whatever you're making is very complex, that's all I can make of it. Can't wait to see it

Also, I decided to make a singleplayer-viable mob arena, and it works brilliantly . It's basically a mob spawner above this large room underground. I enter the arena room, press a lever, and mobs will start to fall down from above, right onto an arena room where I fight. If I die, I can simply press another lever and it will light the spawner and shut it's doors, so I can reclaim my stuff safely

Honors to SuperNintendo for the idea