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Step 8Finished!
Insert into USB port. Wait 2 or so minutes. Remove and push button to use!
It's never going to photograph great, but as you can see it throws off a useful light. In comparison to my brand-name keychain light I'd say it gives maybe 50% of the spread, but greater brightness in the centre of the beam. Maybe using a wide-angle LED would be a good idea.
Endurance wise: I left it to charge for a long time, then quickly removed it and timed how long it ran for. Of course there is no 'cut off', it just gets dimmer, but it definately retains a useful amount of brightness for well over 2 minutes.
TO DO: A custom housing. I'm thinking clear expoxy or silicon. Epoxy I would need to relocate/raise the button, silicon I'd need to look at how much it would gum it up.
In conclusion, a fun project with a pretty cool result.
It's never going to photograph great, but as you can see it throws off a useful light. In comparison to my brand-name keychain light I'd say it gives maybe 50% of the spread, but greater brightness in the centre of the beam. Maybe using a wide-angle LED would be a good idea.
Endurance wise: I left it to charge for a long time, then quickly removed it and timed how long it ran for. Of course there is no 'cut off', it just gets dimmer, but it definately retains a useful amount of brightness for well over 2 minutes.
TO DO: A custom housing. I'm thinking clear expoxy or silicon. Epoxy I would need to relocate/raise the button, silicon I'd need to look at how much it would gum it up.
In conclusion, a fun project with a pretty cool result.
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The middle two pins of the usb A connector are for D+ and D-.
Like Charging Indicator.
The Power level left in Capacitor , as when being used .
The concept of not using batteries justifies the project.
Thanks for this wonderful project.