In memory of Dali

The digital clock need not to have the square form - this one is bent like a pancake.

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This is actually a paraphrase of Dali's painting "Persistence of Memory" (1931), which some critics have argued that was inspired by Einstein's special theory of relativity, but they were denied when Dali said that it was inspired by Camembert cheese melting in the sun.

This digital clock, however, is not made of cheese but FR4, which is normally used for PCBs. The digit segments on the front plate were etched by ferichloride, so the material remained transparent.

Electronic components and diffuse white LEDs are placed on two handmade PCBs, but the process of building light shields between segments was the nightmare for me - different shapes, with differently curved lines and differently cut, placed and soldered, so that light never "leaks" to the adjacent segments. Long live the right angle!

The clock is based on PIC18F2525 and has Li-ion battery backup.

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Stephen Braitsch wrote 05/05/2016 at 17:49 point

Awesome work, looks great!

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spro wrote 12/11/2015 at 03:31 point


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ben.phenoptix wrote 08/12/2015 at 21:50 point

Really love this project. Think it would be good to see it in a wider shot!

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suicidal.banana wrote 05/18/2015 at 10:17 point

Looks great!

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Alex Rich wrote 05/15/2015 at 00:32 point

Very cool piece, I fully support photoshopping the cord.

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Alex Rich wrote 05/14/2015 at 23:29 point

I'll ask what others are too embarrassed to ask, is that first picture real or a rendering?  I see you obviously built the thing based on the third picture but the result just looks too perfect.  Really nice job either way, post more pictures.  How did you bend FR4?

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Voja Antonic wrote 05/15/2015 at 00:07 point

Now when I look at the picture, I can say that it's a good question. It is the real picture taken in my kitchen and very slightly photoshopped, just to delete the supply cable.

The front FR4 is only 0.5 mm thick, it is much easier to bend it than to find FR4 which does not have the manufacturer's logo stamps integrated in the material.

The clock was a part of my Led Art exhibition in Belgrade (sept. 2013).

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