Hey, I've been doing some research into making my own electric hookah coals, by using the same nichrome wire they use for vaping, but on a bit larger scale, suspended in a wind cover over the bowl. The power would be on a switch activated by a lightweight paddle that partially or mostly covers the opening of the wind cover, so when you inhale, the paddle is sucked down, and it hits a switch to turn on the wire. I'd include a capacitor of some sort to keep the wire hot for a little bit after you're done with the first hit, but it would essentially turn off the coils when not in use, since the wire heats up quickly enough (in theory). The only issues I've run into so far are:
1) Wire temperature. I have temped my coals at around 300-350F in the air over them, but I don't quite know if that's hot enough. I've heard from a couple of people it should be more like 400 or 450F to properly heat the tobacco.
2) separating the electronic components and such from the heat. Mainly this involves the microswitch used on the paddle, which would need to be able to resist any heat transfer from the paddle to the switch. the best I've found is a few switches rated up to 300F, so I think I'll play with one of those first, and see if it ends up melting or something.
I figure with it all built into a wind-cover, the unit will work with pretty much any bowl available as long as the cover sits properly over the bowl. Might not even have to use foil, though I'm going to for the first testing iterations just in case.
Any thoughts? Suggestions? Ideas? I've had the project idea in my head for about a year or two now, but am just now getting to the point where I've actively looked into making it. I plan on using a battery for it, with possible optional wall socket power supply as well, depending on the needs of the wire for heating up right.