Another "object" just for joy!

A project log for Enclose them all in super clear epoxy!

Very recently I was so impressed by a Japanese modern artist who draws golden fish in epoxy. I cannot draw but make circuit. Why not!

kodera2tkodera2t 09/09/2018 at 05:566 Comments

This time, I made more simple object just for joy. the above picture shows the object buried inside epoxy resin. Indeed they are object for N-gauge model train, and I added several tiny (1005 (0403)) size LEDs for headlight of car, traffic signals. Just turning on is not so interesting, so I put Arduino boot loader loaded ATmega328 below the basement of traffic signal. I made it looks like the car is ready to fly!!

And here is the completed one. Signal is controlled by MCU and actual operation can be found in the following movie... Have fun!


James Hall wrote 09/13/2018 at 04:28 point

I love it! This is a very neat little diorama.

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Elliot Williams wrote 09/12/2018 at 19:57 point

So much fun.  The "leaping" car looks so cute. 

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Stuart Longland wrote 09/09/2018 at 10:54 point

How feasible would it be to glue everything down to a platform with a shrouded IEC socket underneath for the connection to the outside world and just immerse that up-side-down?

That would allow you to put some feet on the bottom and run a ribbon cable to the base for power and additional signals.  The shroud on the IEC connector should not permit the resin to enter the inside of the connector and there shouldn't be any stress on the wiring on the other side.

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PointyOintment wrote 09/09/2018 at 11:39 point

I don't understand your proposal. Could you draw a diagram?

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Stuart Longland wrote 09/09/2018 at 11:53 point

Okay, I got the wrong acronym, I was thinking IDC not IEC… my memory had a single-bit error in the LSB of the middle byte. ;-)

I could do a diagram, but I'd have to rummage around for a pen, paper and the scanner.  Easiest it wait until I'm at work tomorrow, then I might have some time to do a sketch with the tablet.

You start by arranging everything you want to put into the resin, placing and gluing it to a flat board which will serve as the "base".  You run your cabling, organise everything the way you want it to appear.

You then take a connector like this:

I note a small fly in the ointment is that these have small gaps in the shroud, so we may need to glue some strips of plastic around it to plug those holes.

You solder your wires from your project to the contacts of this connector.  You put your project into your resin mould and pour the resin in, but leave the connector out of the resin.

Carefully, with a plug inserted, you position and lower your connector into the resin such that the connector shroud is mostly immersed in the resin.  All wiring is in the resin.  You let it set.

Now, you have an IDC socket that's connected to your project, embedded in the resin, but is accessible from outside so you can connect and disconnect cables to it as need requires.

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PointyOintment wrote 09/09/2018 at 12:51 point

Diagram is no longer needed (by me at least), now that I know you meant IDC :)

Could you instead use the female IDC connector, with a short bit of ribbon cable fanning out from it to the potted components, within the epoxy? That might be easier to avoid getting epoxy inside the connector. I guess it would necessitate using an unshrouded male header, unless you can somehow get the female connector to stick out of the bottom plane of the epoxy block.

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