Keychain LED flashlight

by berkenbusch, published

Keychain LED flashlight by berkenbusch Aug 7, 2013
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This is a minimalist LED flashlight. Assembly requires - in addition to the two printed parts - a 5mm LED (white or any other color), a 20mm watch battery (I used a CR2032) and a small piece of electrical tape. One of the LED leads is positioned under the battery, the other stays on top. The flexibility of the top lead together with a small piece of electrical tape is used to make a simple switch.
The lid should be a tight fit and stay in place without any glue.

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Where did you buy the leds you used?
How good are they for the flashlight?

I originally bought the LEDs at RadioShack - which went out of business last year, so there's that... I mostly just picked the brightest white 5mm LED they had in their drawers; I am sure you can find something adequate almost anywhere online.
As to how good it is for a flash light - it is good enough to say find a keyhole or not stumble over things in the dark, but don't expect extreme brightness from these.

Downloaded this file, printed a bunch of them and they all work perfectly. A great and useful item here.

someone make a sporkman signal

It's a good idea to use two CR2016s instead of one 2032, so you have 6 volts to start with. 3 volts with a white LED is already very close to its minimum forward voltage so when the battery starts to drop in voltage the LED will get dim very quickly.

I am sure you are right. I originally intended to use two batteries, but I misjudged how much thickness the LED leads would add and I was able to only fit one battery. It is trivial to change the variable 'Bat_d' in the SCAD source to make the battery compartmennt thicker and allow for two cells, though. Maybe if I find the time I will play with it and figure out the right thickness for two 2016s...

5 points if you make a cockpit pod/key ring loop so it looks even MORE like the Millenium Falcon. \o/

Oh, interesting observation. The Millenium Falcon actually never crossed my mind when I designed this thing.