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Video: Amazing electronic trick (how is this done?)

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Greg_EE
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re: Video: Amazing electronic trick (how is this done?)
Greg_EE   9/9/2011 3:45:39 PM
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One revision to my previous explanation, I think that the magic box simply alternates the order in which the LEDs light in each "round." All four switch presses (not just the last three) are assigning switches to LEDs. That way one can truly randomize where all the LEDs and switch caps go, and then the magician just has to hit the switches in the correct order during programming.

agk
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re: Video: Amazing electronic trick (how is this done?)
agk   9/7/2011 9:33:44 AM
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What ever be it is.There is a digital electronic circuit controlling the LED's and switches. How it is made and concealed is the real work.Plus the operator switching on the switches has a pattern and reflects from the program.

tb1
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re: Video: Amazing electronic trick (how is this done?)
tb1   9/6/2011 2:48:15 PM
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The box that turns itself off was actually patented, by none other than Claude Shannon! http://www.kk.org/thetechnium/archives/2008/03/the_unspeakable.php

Max The Magnificent
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re: Video: Amazing electronic trick (how is this done?)
Max The Magnificent   9/6/2011 2:09:46 PM
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I think this would be amazingly cool -- the camera could be build into some base upon which you rest the clear case -- I can't wait to see it when you've built it :-)

BobC_
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re: Video: Amazing electronic trick (how is this done?)
BobC_   9/6/2011 10:40:46 AM
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None of the videos showed switch color changes while lamps were lit. Is this a necessary limitation? It certainly is, if only a simple state machine is used. Let's assume it is NOT a necessary limitation! 1. What would happen if you remove a switch color tag while the corresponding lamp was illuminated? 2. What if you rearranged the switch colors while one or more or even all the lamps were illuminated? How would you like the above scenarios to work in order to maintain the mystery? Think about it... There are several possible functionalities to consider. Give me a tiny digital QVGA pin-hole color camera and an FPGA, and I can do this (and more) quite easily! 1. Aim the camera so it can see all switches and lamps. 2. Identify which pixels identify which items, and hard-code the mapping. 3. Dynamically update the mapping with each frame. Only a low frame rate is needed, perhaps no faster than 2-3 Hz. For simpler modes, a frame is captured only when a switch transitions to the ON state. The logic is relatively simple. The neat part is that a clear box makes the implementation simpler. Otherwise, you'll need to hide the external camera, either under a black cloth, or within a wood frame. What do you think?

emonkey
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re: Video: Amazing electronic trick (how is this done?)
emonkey   9/2/2011 9:42:40 PM
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Greg's got it. "The order one puts on the switch caps or moves the LEDs can be completely random (I even had my students mix them up they way they wanted)." However, the order the operator turns on the switches for the programming step is not random.

Greg_EE
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re: Video: Amazing electronic trick (how is this done?)
Greg_EE   9/1/2011 11:16:11 PM
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I think I have it, or at least I'm close. The first switch flip determines the order that the LEDs initially light. The second, third, and fourth switch flips tell the logic which switch to map to which LED. If you name the LEDs A, B, C, and D left to right, you'll notice they only turn on in two sequences. If you flip either of the outside switches first, the lights appear in this order: D, C, B, A If you flip either of the inside switches first, the lights appear in this order: B, D, C, A Since the magician knows what order the lights are going to turn on, he just makes sure to hit the switches in the right corresponding color. Once you have four switch presses your programming is complete and you can flip whichever switch you like. Whenever there is a long enough delay (bulbs or caps being switched) the state machine resets and waits for the next programming.

Max The Magnificent
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re: Video: Amazing electronic trick (how is this done?)
Max The Magnificent   9/1/2011 6:33:44 PM
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This is making my head hurt...

Max The Magnificent
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re: Video: Amazing electronic trick (how is this done?)
Max The Magnificent   9/1/2011 6:33:05 PM
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There could be hearing aid batteries hidden in the battery compartment In this version he turns the whole thing round and you also see that it's lifted off the table for a short time http://www.youtube.com/watch?v=l9ShZQepZ0o&feature=related

Max The Magnificent
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re: Video: Amazing electronic trick (how is this done?)
Max The Magnificent   9/1/2011 6:30:16 PM
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Oh -- I see what you mean -- let me think about that -- I'll have to watch all of these videos again...

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