So I can take a picture of myself without needing super stretchy arms.
Here's a great article about building the timer. It is setup for a camera that takes an external timer, release or intervaleometer. You will have to figure out how to make a release work with your camera unless you want to open it up and tie into the switch contacts. I personally would try a small solenoid attached above the shutter button and pressing on a spring that then pressed on the button. It should press on the button for about a second to allow the camera to focus and take the picture. You could do this with a servo or motor and gears but then you'll have to design a way for the circuit to reverse itself.
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Very nice, thanks!
Here's a good article that includes mounting a servo to press the button on a camera.
What camera is it? Some will allow you to trigger the shutter, would mean you wouldn't need the servo.
No it doesn't allow that, I already checked.