LED Music Submerged in mineral oil.

I have seen led music cubes and prisms here but is it at all possible that you could make one that does light up to music in a plexi glass cube but filled with mineral oil? If I were to do this of course itd have to be sealed water tight so nothing leaks, but is there anything else that might need to occur? Per say would I have to add a dye to the mineral oil to get a good luminosity effect or would it be shining bright without it? If you could throw me some things that might be flawed in this idea or advice I would appreciate it lots!

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AndyGadget6 years ago
If it's going to be portable you'd need a way of turning on and off.  you could use a bump switch as suggested or a reed switch operated by a magnet outside the cube. Depending on which type of reed switch you use you could either have the cube ON or OFF with a magnet present.

you could use rechargeables and have a pair of (well sealed) contacts going through the plexiglass to connect charging leads to, or a cable, which you'd need if it's permanently powered. You'd have to watch out for leaks around the entry point.

Clear glass marbles or similar in the oil would give an interesting effect as they would refract the LED light.  Or, glitter flakes to reflect the light and a small circulating pump to move things around.

PersonPwner (author)  AndyGadget6 years ago
Oh and I forgot, More than likely since you mention a reed switch with a magnet it seems like a great idea.
PersonPwner (author)  AndyGadget6 years ago
Never thought of the charging leads, I was thinking making the Power source external for ease but it doesnt make it look as pretty. I will take this charging leads into consideration thank you for the input!
Malkaris1 year ago

I tried a few "additives" to my mineral oil submerged computer. For instance, glow-in-the-dark powder, the stuff added to paint to make it glow. Very dense powder, just sank to the bottom of the tank, didn't suspend at all.

I had a little more luck with mica-flakes (the stuff that make makeup shimmer, or those squishy pearly tubes you find at gift-shops) but you'd have to shake it up like a snow globe to keep it suspended.

orksecurity6 years ago
Surprisingly, it's quite possible to run low-voltage electronics submerged in some liquids, mineral oil being one of the more affordable examples for homebrewers. Websearch "fishtank computer" for some examples (and/or look under Related at right for an example), which will also give you an idea of what it looks like. In Theory, this is one of the most effective cooling techniques available; in practice it's messy and a potential fire hazard. (The Cray II supercomputer used this cooling approach, but used a chloroflurocarbon as the liquid to avoid the fire risk... of course they had to clear that with the EPA.)

Adding a dye might change the electrical characteristics of the mineral oil, or might erode the electronics over time. I suspect by something that's as simple as blinking lights you'd be fine, but without a lot of analysis the best I can tell you is "try it and let us know how it works."

As others have said, you need to think about how you're going to get power, signal (if you really want it to be music-responsive) and control into it. Assuming you don't plan to just seal it, let it run, and then unseal or discard when the batteries finally die.
PersonPwner (author)  orksecurity6 years ago
I have seen the fishtank computer before which is actaully why i thought of this idea funny you mention. I was considering a dye but now that you mention that it may mess with the characteristics Its probably best not to use it. Thank you!
iceng6 years ago
I had sealed plexiglass Ice Cubes with LED & a single button battery inside.

To turn it on you would slap the cube to a table red dot down.
Shifting the button battery into wiping contacts (LED ON).

To turn it off you would slap the cube to a table black dot down.
Shifting the button battery out of wiping contact (LED oFF).

Turn a few colored LED ice cubes on in an evening refreshment
for a festive bowl of Quinine soda that additionally glows bright blue
under Ultraviolet Light and some dry ice makes a outstanding
table decoration.