Author Topic: Water Light Grafitti - Nice LED art work  (Read 1772 times)

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Online mariush

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Water Light Grafitti - Nice LED art work
« on: August 26, 2012, 04:30:15 am »

http://www.tecca.com/news/2012/08/22/water-light-graffiti-video

Video : 

The "Water Light Graffiti" is a surface made of thousands of LED illuminated by the contact of water. You can use a paintbrush, a water atomizer, your fingers or anything damp to sketch a brightness message or just to draw. Water Light Graffiti is a wall for ephemeral messages in the urban space without deterioration. A wall to communicate and share magically in the city.
More pictures and details on Digitalarti : bit.ly/O2v7aw
 

Offline T4P

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Re: Water Light Grafitti - Nice LED art work
« Reply #1 on: August 26, 2012, 05:45:03 am »
I would think a shitload of precision moisture sensors? Or capacitive sensors  :P
 

Offline cwalex

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Re: Water Light Grafitti - Nice LED art work
« Reply #2 on: August 26, 2012, 07:13:36 am »
There should be one in every urinal!  ;D
 

Offline Psi

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Re: Water Light Grafitti - Nice LED art work
« Reply #3 on: August 26, 2012, 07:30:49 am »
Maybe just adjacent pcb tracks/pads.
Subtract out the resistance from the thin film of residual water that sticks on the pcb.
Any lower resistance than that = water detected.
Greek letter 'Psi' (not Pounds per Square Inch)
 

Offline Astroplio

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Re: Water Light Grafitti - Nice LED art work
« Reply #4 on: August 26, 2012, 07:31:47 am »
From what I understand here:

http://youtu.be/Ch-gYF1v3ls

They use no special sensors, water comes in contact with PCB, bridges the traces around the LED so as the total resistance changes so does the LED luminosity. When water evaporates LED goes off again.


 

Offline mikeselectricstuff

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Re: Water Light Grafitti - Nice LED art work
« Reply #5 on: August 26, 2012, 08:54:34 am »
Cool but won't last long due to electrolytic corrosion. Running on AC with back-to-back LEDs may be slightly more durable.

Youtube channel:Taking wierd stuff apart. Very apart.
Mike's Electric Stuff: High voltage, vintage electronics etc.
Day Job: Mostly LEDs
 


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