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Keychain LED flashlight

by berkenbusch, published

Keychain LED flashlight by berkenbusch Aug 7, 2013

Description

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

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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.
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