https://play.google.com/store/apps/deta ... mote&hl=en
Let your smartphone (or tablet) be a remote control, a timer or a HDR controller for your digital camera.
Whether via infrared, by wire or via Bluetooth, DSLR Remote enables you to take timer controlled exposure series (e.g. for time lapse), long time exposures or exposure sequences in the context of High Dynamik Range photography.
If you are not using a device with a supported built-in IR sender, all you need is a small, inexpensive and easy to build hardware, which is then connected to the earphone jack of your smartphone.
You will find detailed instructions on how to build the required hardware on the author's website http://bitshift.bplaced.net.