If its jsut purely for waterproofing and not asthetics I wrap them in heat shrink and seal the ends with hot glue I have all sorts of sizes of 3:1 heatshrink all the way from 1" wide to 8" wide.
Here is my gateway thats sits next to me(took photo right now) the ends are not sealed but you get the idea
https://i.imgur.com/7dR4xZT.jpg

@NeverDie said in Waterproofing by embedding in epoxy:

@Dreded I'm not sure about the hot glue part of it, but you're right: I notice the heat shrink tubing with the glue on the inside is advertised as "marine grade". Perhaps you could simply clamp the ends when the glue is still hot to make a "marine grade" seal.

thats what I was meaning, I put the hot glue in and clamp it with a vice while it cools usually leave an extra 2" of heatshrink tubing and cut it off after the clamping to a reasonable length, I figure the vices teath leaving bumpy marks might help the seal... for something I just am putting out in the weather I often just squish it by hand depnding on the size of it.

I have made lit up pool toys this way and no issues so far with over a year of kids tossing them about.

@Pascal-JEANPIERRE It is awesome you are trying to teach your students about automation, but PLEASE if you are going to teach it using arduino etc and cant even change a #define statement(that is located at the top of a file written in plain english) take a simple arduino course of some sort or a C programming course.

this stuff is super simple to learn and a few evening of effort on your end will go very far to teach properly.

If its jsut purely for waterproofing and not asthetics I wrap them in heat shrink and seal the ends with hot glue I have all sorts of sizes of 3:1 heatshrink all the way from 1" wide to 8" wide.
Here is my gateway thats sits next to me(took photo right now) the ends are not sealed but you get the idea
https://i.imgur.com/7dR4xZT.jpg

why not just put it on a Nano? if I was starting from scratch I would just buy some RF Nano's https://www.amazon.com/Keywish-Integrate-ATmega328P-Micro-Controller-Compatible/dp/B07RDJYTZC/ref=sr_1_3?keywords=rf%2Bnano&qid=1582004486&sr=8-3&th=1

no soldering or anything for the gateway you just need to plug it into PC upload the example serial gateway code and then plug it into the NUC or whatever and you are done.. serial to USB gateway completed in 5min