I've been taking used motors and running them like a generator to make light.
Been making them for about 20 years.
I posted them on etsy a couple yeas ago but haven't sold many.
https://www.etsy.com/listing/219179116/led-light-toy-hacked-from-used?ref=shop_home_active_1&sca=1
I thought a flashlight made from used electronics,
that doesn't have batteries or switches to corrode
and should outlast the grandkids of whoever buys it
would sell fast.
But I'm a terrible marketer.
I get just a few visits to my etsy store a month.
How I sold 2 this year:
I walked up to the "will call" tent at a festival,
with a toy hanging out of my pocket.
The ticket lady asked me where I got it.
I told her I made it.
She told me her husband bought one a few years ago and said he should have bought all 4 I had.
She called him, told him I had them on etsy and he bought 2,.. so far hehe.
I also have to mention just because this is permies and I think everyone will get a laugh out of it;
My testing reveals that it will stop a child's crying like that (fingers snap).
I was in Aldi and a 2 or 3 year old was crying,
could hear it all through the store.
Well guess who was in line right in front of me.
I rolled it slow down my arm (so it doesn't get too bright) once, tapers off,..
twice,.. the most peaceful face you've ever seen on a child.
I looked behind me at the people in line,
standing there with their mouths open.
Just case studies, no double blind testing.
I don't mention that on my Etsy
At an auction or in church it has always worked,
But I can't seriously make that claim.
It's the funniest thing about this toy,..
I find myself hoping to cross paths with a crying child/test subject.
So if you get a chance check out my Etsy site,.. let me know what you think of it or any improvements I can make.