On Tue, 8 Nov 2011 17:33:58 -0300, Werner Almesberger wrote:
[email protected] wrote:
in my tests, there was no shorting, but I do need a piece of
something to make the batteries fit snug in the tin anyways.
Yeah, preferably something elastic or the contacts will be very
unreliable. Ideally, you'd use spring-loaded pins to make the
contact, so that you don't need to push the battery.
You may be able to find connectors with suitable spring-loaded
pins in old mobile phones or you could buy a new connector.
Alternatively, you could also use pogo pins, but you won't find
them at Radio Shack. Consider these product categories:
http://search.digikey.com/us/en/cat/connectors-interconnects/rectangular-spring-loaded/1442900
http://search.digikey.com/us/en/cat/connectors-interconnects/contacts-spring-loaded-and-pressure/1442508
so the pins touching the metal wall of the can is ok if it is just
on the outside? The wood would sort of prevent the pins from
touching the inside of the tin?
Was thinking of something like this:
http://downloads.qi-hardware.com/people/werner/tmp/batbox.png
The only things crossing the wall would be the isolated parts of
the plugs. The metal pins would be covered by the wood. You can
allow a tiny gap on the can side as long as you can limit
movement of the wood block such that the can can't touch the
pins. (It all would be easier if the pins were fixed. Then you
could simply isolate things with silicone.)
- Werner
_______________________________________________
The difference between that CAD file and my actual setup is that the
thin metal parts of the pins only pass through the holes, your file
shows the entire insulated circumference poking through the tin. That
would require me to make bigger and fewer holes. I have since made more
holes so that I could push the metal pins in to meet and fit many
battery types, that was a design feature I wanted to include. If I drill
big holes, I would lose that functionality, at least in that method.
I did think about springs and will try to find some scrap for the
prototype.
I will also get some thinner wire because 18 gauge is monstrous and I
accidentally got solid core.
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