Over Christmas break (on Christmas Eve morning, to be specific) I decided to make myself a USB remote for my camera(s), so I thought I'd share my fully functional (yet very sketchy-looking) design. Unfortunately I did not take pics of the procedure, but I can explain it well enough and show the finished product.
What I did was I used an old cellphone battery as the power source. One similar to this:
It being 3.7v, it was perfect for both my PowerShots; my old A530 and my new SX150 IS. I then soldered in the push-button switch, but I also added in a 2-way switch. When turned on, this switch will charge the battery when the cable is plugged into a USB power source (it also works for taking continuous shots when in continuous mode). This switch is show here:
Then I simply put electrical tape over any exposed connections and duct taped the whole setup to an old cellphone toy. This is the finished product:
Professional-looking? No (except maybe for suicide bombers.) Functional? Yes.
Anyway, just thought I'd share that.
~NightPhotoNoob