Arduino (I use freetronics leostick)
a remote plug for your camera
a 4x AA battery pack
3 position switch for version 2
Step 1: Connect the battery and relay
Now connect the coil pins of the relay to the GND and digital 6 pins on the arduino.
Connect the plug for the camera to the relay as shown in the diagram. Make it so without power to the relay, the remote circuit is broken.