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Powers of observation, Can you find the LED? — Parallax Forums

Powers of observation, Can you find the LED?

W9GFOW9GFO Posts: 4,010
edited 2012-11-29 18:29 in General Discussion
Following the link in this thread I found this;



How are your powers of observation?
Can you find the LED:

[IMG]http://talkingelectronics.com/projects/50 - 555 Circuits/images/LED-Puzzle.gif[/IMG]

Comments

  • Heater.Heater. Posts: 21,230
    edited 2012-11-28 23:49
    Yep. Easy.
  • Phil Pilgrim (PhiPi)Phil Pilgrim (PhiPi) Posts: 23,514
    edited 2012-11-29 01:16
    Gaaaah!

    First, I observed that it's a GIF, which immediately suggests animated GIF. Waiting for the LED to flash. Nope.

    Hmmm. Maybe it's one of those Magic Eye 3D things. 'Tried crossing my eyes every which way. Nope.

    Maybe it's in the white space between the diodes. 'Loaded it into Corel PhotoPaint and reversed the black and white. Nope.

    Perhaps Heater's just yanking everybody's chain., pretending to have found it. Yep; I bet that's it. :)

    -Phil
  • SRLMSRLM Posts: 5,045
    edited 2012-11-29 01:46
    No, I can't find it. It also doesn't seem to be formed from a set of the diodes, i.e., the image has one large LED made up of the diodes and whitespace.

    Edit: Ok, I found it now. It's a bit rough, sort of like an archeologist saying "They had a corral here. I know because there are specific types of rocks in the ground in a repeating pattern." It's indicative, but not what you imagine a corral looks like.
  • Heater.Heater. Posts: 21,230
    edited 2012-11-29 02:52
    Just imagine that each one of those diodes was a LED. A LED matrix.
    Now imagine you turn on all the LEDs that have their cathodes on the left.
    What do yo see now?
  • Phil Pilgrim (PhiPi)Phil Pilgrim (PhiPi) Posts: 23,514
    edited 2012-11-29 10:39
    Grrrrr. As the man said, "Yep. Easy." :)

    -Phil
  • ElectricAyeElectricAye Posts: 4,561
    edited 2012-11-29 14:29
    The correct answer is No.
  • mindrobotsmindrobots Posts: 6,506
    edited 2012-11-29 14:38
    ElectricAye wrote: »
    The correct answer is No.

    +1
  • W9GFOW9GFO Posts: 4,010
    edited 2012-11-29 14:40
    Here is a visual aid;

    LED Puzzle Solution.gif
    LED Puzzle Solution.gif
    302 x 246 - 9K
  • ElectricAyeElectricAye Posts: 4,561
    edited 2012-11-29 14:48
    W9GFO wrote: »
    Here is a visual aid...

    Okay, but the question asks if "you" can see it, and since I'm reading the question, I presume I'm the "you" in this case, in which case I can't lie: I just suck at puzzles like this. But don't feel sorry for me - save your sympathy for Phil. The poor man gets drawn into these things and squanders valuable time he could be working on his Prop-based thermal imager that I'm still waiting for.
  • Mark_TMark_T Posts: 1,981
    edited 2012-11-29 16:55
    If you hold a piece of perfboard or stripboard in front of the screen at just the right distance so one hole is in front of each small
    diode image, and move it around slowly while squinting hard, it only just becomes visible - you can judge if the distance is right
    when the moire pattern gets larger.
  • Oldbitcollector (Jeff)Oldbitcollector (Jeff) Posts: 8,091
    edited 2012-11-29 18:20
    Head was starting to hurt... That helped!
    W9GFO wrote: »
    Here is a visual aid;

    LED Puzzle Solution.gif
  • NWCCTVNWCCTV Posts: 3,629
    edited 2012-11-29 18:29
    I don't get it. Since an LED is a diode, what is to say that the visual aid is correct? They all look the same to me.
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